Rhenium disulfide(ReS_2), a member of group Ⅶ transition metal dichalcogenides(TMDs), has attracted increasing attention because of its unique distorted 1T structure and electronic and optical properties, which are m...Rhenium disulfide(ReS_2), a member of group Ⅶ transition metal dichalcogenides(TMDs), has attracted increasing attention because of its unique distorted 1T structure and electronic and optical properties, which are much different from those of group Ⅵ TMDs(MoS_2, WS_2, MoSe_2, WSe_2, etc.). It has been proved that bulk ReS_2 behaves as a stack of electronically and vibrationally decoupled monolayers, which offers remarkable possibilities to prepare a monolayer ReS_2 facilely and offers a novel platform to study photonic properties of TMDs. However,due to the large and layer-independent bandgap, the nonlinear optical properties of ReS_2 from the visible to midinfrared spectral range have not yet been investigated. Here, the band structure of ReS_2 with the introduction of defects is simulated by the ab initio method, and the results indicate that the bandgap can be reduced from 1.38 to 0.54 eV with the introduction of defects in a suitable range. In the experiment, using a bulk ReS_2 with suitable defects as the raw material, a few-layered broadband ReS_2 saturable absorber(SA) is prepared by the liquid phase exfoliation method. Using the as-prepared ReS_2 SA, passively Q-switched solid-state lasers at wavelengths of 0.64,1.064, and 1.991 μm are investigated systematically. Moreover, with cavity design, a femtosecond passively modelocked laser at 1.06 μm is successfully realized based on the as-prepared ReS_2 SA for the first time. The results present a promising alternative for a rare broadband optical modulator and indicate the potential of ReS_2 in generating Q-switched and mode-locked pulsed lasers. It is further anticipated that this work may be helpful for the design of 2D optoelectronic devices with variable bandgaps.展开更多
Due to the manifestation of fascinating physical phenomena and materials science, two-dimensional（2D） materials have recently attracted enormous research interest with respect to the fields of electronics and optoel...Due to the manifestation of fascinating physical phenomena and materials science, two-dimensional（2D） materials have recently attracted enormous research interest with respect to the fields of electronics and optoelectronics.There have been in-depth investigations of the nonlinear properties with respect to saturable absorption, and many 2D materials show potential application in optical switches for passive pulsed lasers. However, the Eigen band-gap determines the responding wavelength band and constrains the applications. In this paper, based on band-gap engineering, some different types of 2D broadband saturable absorbers are reviewed in detail, including molybdenum disulfide（MoS2）, vanadium dioxide（VO2）, graphene, and the Bi2Se3 topological insulator. The results suggest that the band-gap modification should play important roles in 2D broadband saturable materials and can provide some inspiration for the exploration and design of 2D nanodevices.展开更多
We report on the successful demonstration of a 150 J nanosecond pulsed cryogenic gas cooled,diode-pumped multi-slab Yb:YAG laser operating at 1 Hz.To the best of our knowledge,this is the highest energy ever recorded ...We report on the successful demonstration of a 150 J nanosecond pulsed cryogenic gas cooled,diode-pumped multi-slab Yb:YAG laser operating at 1 Hz.To the best of our knowledge,this is the highest energy ever recorded for a diodepumped laser system.展开更多
A direct Kerr-lens mode-locked Tm:LuYO_(3)ceramic laser without the aid of any mode-locked starting element is reported for the first time. A pulse duration as short as 259 fs and a maximum average output power of 326...A direct Kerr-lens mode-locked Tm:LuYO_(3)ceramic laser without the aid of any mode-locked starting element is reported for the first time. A pulse duration as short as 259 fs and a maximum average output power of 326 m W are obtained at a repetition rate of 97.1 MHz. The corresponding optical spectrum centered at 2053 nm exhibits a bandwidth of 19.8 nm,which indicates the presence of nearly Fourier transform-limited pulses. Such a Kerr-lens mode-locked Tm:LuYO_(3)ceramic laser is a promising ultrashort pulse source, with both the excellent laser characteristics of Tm:LuYO3and the high-power 790 nm laser diode pumping scheme.展开更多
A transmission-type tungsten disulfide(WS_2)-based saturable absorber(SA) is fabricated and applied to passively Q-switched Nd:YVO_4 laser.The WS_2 nanosheets are deposited on a quartz substrate by the vertical evapor...A transmission-type tungsten disulfide(WS_2)-based saturable absorber(SA) is fabricated and applied to passively Q-switched Nd:YVO_4 laser.The WS_2 nanosheets are deposited on a quartz substrate by the vertical evaporation method.By inserting the WS2 SA into the plano-concave laser cavity,we achieve 153-ns pulses with an average output power of1.19 W at 1064 nm.To the best of our knowledge,both of them are the best results among those obtained by the Q-switched solid-state lasers with WS_2-based absorbers.The repetition rate ranges from 1.176 MHz to 1.578 MHz.As far as we know,it is the first time that MHz level Q-switched pulses have been generated in all solid state lasers based on low-dimensional materials so far.展开更多
A Yb-doped CaF2 transparent ceramics was successfully fabricated by the hot-pressed method and its laser characteristics were studied.A broad tuning performance and mode-locked laser operation were demonstrated in th...A Yb-doped CaF2 transparent ceramics was successfully fabricated by the hot-pressed method and its laser characteristics were studied.A broad tuning performance and mode-locked laser operation were demonstrated in this ceramics for the first time,to our best knowledge.A 60-nm continuous-wavelength tunable laser from 1019 nm to 1079 nm was obtained with a birefringent filter.By employing a semiconductor saturable absorber mirror without additional dispersion compensation elements,a continuous-wave mode-locked laser with pulse duration as short as 575 fs was delivered,at a central wavelength of 1048.5 nm.The oscillator is operated under a repetition rate of 55 MHz.These results indicate that the Yb:CaF2 transparent ceramics is an ideal candidate for the development of ultrafast lasers in the near-infrared regime.展开更多
Stable,efficient and high color rendering index all-inorganic color converters are urgently demanded for white laser diodes.Phosphor-in-glass(PiG),possessing the advantages of phosphors excellent quantum efficiency as...Stable,efficient and high color rendering index all-inorganic color converters are urgently demanded for white laser diodes.Phosphor-in-glass(PiG),possessing the advantages of phosphors excellent quantum efficiency as well as favorable chemical and thermal stability of glass,has attracted widespread attention.There have been only very few reports of Y_(1.31)Ce_(0.09)Gd_(1.6)Al_(5)O_(12)(Ce:GdYAG)PiG for solid-state laser light-ing.Herein,a series of Ce:GdYAG PiG samples are fabricated by a simple solid-state sintering method.Impressively,the supreme internal quantum efficiency of as-prepared PiG is 91%,which is very close to original phosphors(95%).Furthermore,PiG exhibits a high thermal conductivity(1.844 W m^(−1)K^(−1))and a maximum transparency(62%).Remarkably,by changing the concentration of phosphors and the thickness of PiG samples,a luminous efficacy of 163.5 lm/W,high color rendering index of 74.8 and low correlated color temperature of 4806.8 K are achieved under blue laser irradiation.These results indicate that the Ce:GdYAG PiG samples have shown tremendous application foreground as all-inorganic color converter for solid-state laser lighting.展开更多
Erbium fiber lasers of continuous mode outputs and of pulsed picosecond and sub-picosecond pulses train are reported. Compact all solid state passively modulated microchip lasers are also developed to the same degree.
In this paper,we reported a multiwavelength passively Q-switched Yb3+:GdAl3（BO3）4 solid-state laser with topological insulator Bi2Te3 as a saturable absorber（SA） for the first time,to the best of our knowledge.Bi2...In this paper,we reported a multiwavelength passively Q-switched Yb3+:GdAl3（BO3）4 solid-state laser with topological insulator Bi2Te3 as a saturable absorber（SA） for the first time,to the best of our knowledge.Bi2Te3 nanosheets were prepared by the facile solvothermal method.The influence of three Bi2Te3 densities on the laser operation was compared.The maximum average output power was up to 57 mW with a pulse energy of 511.7 nJ.The shortest pulsewidth was measured to be 370 ns with 110 kHz pulse repetition rate and 40 mW average power.The laser operated at three wavelengths simultaneously at 1043.7,1045.3,and 1046.2 nm,of which the frequency differences were within the terahertz wave band.Our work suggests that solvothermal synthesized Bi2Te3 is a promising SA for simultaneously multiwavelength laser operation.展开更多
We report on broadly wavelength-tunable passive mode-locking with high power operating at the 2 μm water absorption band in a Tm:CYA crystal laser. With a simple quartz plate, stable mode-locking wavelengths can be t...We report on broadly wavelength-tunable passive mode-locking with high power operating at the 2 μm water absorption band in a Tm:CYA crystal laser. With a simple quartz plate, stable mode-locking wavelengths can be tuned from 1874 to 1973 nm, with a tunable wavelength range up to ~100 nm and maximum output power up to 1.35 W. The bandwidth is narrow as ~6 GHz, corresponding to a high coherence. To our knowledge, this is the first demonstration of wavelength-tunable mode-locking with watt-level in the 2 μm water absorption band.The high temporal coherent laser can be further applied in spectroscopy, the efficient excitation of molecules, sensing, and quantum optics.展开更多
Two-dimensional(2 D) Te nanosheets were successfully fabricated through the liquid-phase exfoliation(LPE) method. The nonlinear optical properties of 2 D Te nanosheets were studied by the open-aperture Z-scan techniqu...Two-dimensional(2 D) Te nanosheets were successfully fabricated through the liquid-phase exfoliation(LPE) method. The nonlinear optical properties of 2 D Te nanosheets were studied by the open-aperture Z-scan technique. Furthermore, the continuous wave mode-locked Nd:YVO4 laser was successfully realized by using 2 D Te as a saturable absorber(SA) for the first time, to the best of our knowledge. Ultrashort pulses as short as 5.8 ps were obtained at 1064.3 nm with an output power of 851 m W. This primary investigation indicates that the 2 D Te SA is a promising photonic device in the fields of ultrafast solid-state lasers.展开更多
1 Results The development of tuneable solid-state organic dye lasers is a subject of considerable interest and research activity.Compared to conventional liquid dye lasers they have the advantage of being free of solv...1 Results The development of tuneable solid-state organic dye lasers is a subject of considerable interest and research activity.Compared to conventional liquid dye lasers they have the advantage of being free of solvent handling,having small size,and being easy to operate.For high-performance solid-state dye lasers highly photo-stable dyes with low quantum yield of triplet formation and low triplet-triplet absorption cross-section in the lasing wavelength region are required.For solid state dye lasers ...展开更多
Recent results in the development of diode-driven high energy, high repetition rate, picosecond lasers, including the demonstration of a cryogenic Yb:YAG active mirror amplifier that produces 1.5 J pulses at 500 Hz re...Recent results in the development of diode-driven high energy, high repetition rate, picosecond lasers, including the demonstration of a cryogenic Yb:YAG active mirror amplifier that produces 1.5 J pulses at 500 Hz repetition rate(0.75 kW average power) are reviewed. These pulses are compressed resulting in the generation of ~5 ps duration,1 J pulses with 0.5 kW average power. A full characterization of this high power cryogenic amplifier, including atwavelength interferometry of the active region under >1 kW average power pump conditions, is presented. An initial demonstration of operation at 1 kW average power(1 J, 1 k Hz) is reported.展开更多
We reporte and demonstrate a solid-state laser to achieve controlled generation of order-switchable cylindrical vector beams(CVBs).In the cavity,a group of vortex wave plates(VWPs)with two quarter-wave plates between ...We reporte and demonstrate a solid-state laser to achieve controlled generation of order-switchable cylindrical vector beams(CVBs).In the cavity,a group of vortex wave plates(VWPs)with two quarter-wave plates between the VWPs was utilized to achieve mode conversion and order-switch of CVBs.By utilizing two VWPs of first and third orders,the second and fourth order CVBs were obtained,with mode purities of 96.8%and 94.8%,and sloping efficiencies of 4.45%and 3.06%,respectively.Furthermore,by applying three VWPs of first,second,and third orders,the mode-switchable Gaussian beam,second,fourth,and sixth order CVBs were generated.展开更多
In this paper,the absorption and fluorescence spectra of Er^(3+),Pr^(3+)co-doped LiYF_(4)(Er,Pr:YLF)crystal were measured and analyzed.The Pr^(3+)co-doping was proved to effectively enhance the Er^(3+)∶^(4)I_(11/2)→...In this paper,the absorption and fluorescence spectra of Er^(3+),Pr^(3+)co-doped LiYF_(4)(Er,Pr:YLF)crystal were measured and analyzed.The Pr^(3+)co-doping was proved to effectively enhance the Er^(3+)∶^(4)I_(11/2)→^(4)I_(13/2)mid-infrared transition at the 2.7μm with 74.1%energy transfer efficiency from Er^(3+)∶^(4)I_(13/2)to Pr^(3+)∶^(3)F_(4).By using the Judd–Ofelt theory,the stimulated emission cross section was calculated to be 1.834×10^(-20)cm^(2)at 2685 nm and 1.359×10^(-20)cm^(2)at 2804.6 nm.Moreover,a diode-end-pumped Er,Pr:YLF laser operating at 2659 nm was realized for the first time,to the best of our knowledge.The maximum output power was determined to be 258 m W with a slope efficiency of 7.4%,and the corresponding beam quality factors m^(2)_x=1.29 and m^(2)_(y)=1.25.Our results suggest that Er,Pr:YLF should be a promising material for 2.7μm laser generation.展开更多
We report on laser diode(LD) pumped passively Q-switched Yb,Gd:SrF2 lasers with high single-pulse energy for the first time, to the best of our knowledge. In addition, a stable Q-switched laser based on a Cr4+:Y3Al5O1...We report on laser diode(LD) pumped passively Q-switched Yb,Gd:SrF2 lasers with high single-pulse energy for the first time, to the best of our knowledge. In addition, a stable Q-switched laser based on a Cr4+:Y3Al5O12 saturable absorber was demonstrated. The maximum output power of the Q-switched laser obtained was 495 m W, with a pulse width and a pulse repetition rate of 233 ns and 1.238 kHz, respectively. The corresponding single-pulse energy and the peak power were as high as 400 μJ and 1.714 k W. The laser was operated under a transverse electromagnetic mode, and the beam quality was near-diffraction-limited.展开更多
We report on the study of single-mode fiber-laser-pumped mode-locked Yb:CALYO lasers via using a passive saturable absorber and Kerr-lens mode-locking technique,respectively.Up to 3.1-W average power with 103-fs pulse...We report on the study of single-mode fiber-laser-pumped mode-locked Yb:CALYO lasers via using a passive saturable absorber and Kerr-lens mode-locking technique,respectively.Up to 3.1-W average power with 103-fs pulse duration is obtained from the passive mode-locking,and down to 36-fs pulse duration with more than 2-W average power is achieved by the pure Kerr-lens mode-locking,which is to the best of our knowledge,the highest average power from a reported sub-40-fs Yb-based solid-state oscillator.展开更多
Detailed power and spectral analysis of a diode-pumped c-cut Pbnm 3 at.% Tm-doped yttrium aluminum perovskite(Tm:YAP) laser in a continuous wave(CW) operation is presented. The laser was experimentally examined in ter...Detailed power and spectral analysis of a diode-pumped c-cut Pbnm 3 at.% Tm-doped yttrium aluminum perovskite(Tm:YAP) laser in a continuous wave(CW) operation is presented. The laser was experimentally examined in terms of the dependence on the transmittance and radius of curvature of the output coupling mirrors.At room temperature, for an output coupling transmission of 10.8%, the maximum output power of 6.35 W was obtained under a total absorbed pump power of 13.67 W with an optical-to-optical conversion efficiency of 46.5%. The highest slope efficiency of 60.4% was indicated. A detailed spectral analysis was presented. For its dependence on output coupler transmission, the Tm:YAP laser generates wavelengths at approximately 1940 nm or 1990 nm.展开更多
Optical damages, which severely degrade the output energy performance of Nd:glass regenerative amplifiers, are discussed in detail in this paper. By a series of experiments, it has been confirmed that these damages re...Optical damages, which severely degrade the output energy performance of Nd:glass regenerative amplifiers, are discussed in detail in this paper. By a series of experiments, it has been confirmed that these damages result from laser-induced contamination. Based on this work, several improvements are made to boost output energy performance of the regenerative amplifier. The output energy of the regenerative amplifier after improvements declines 4% after 1000 h of operation, much less than it used to, 60% after 560 h of operation.展开更多
基金National Natural Science Foundation of China(NSFC)(51321091,61505098,61575110,61675116)Young Scholars Program of Shandong University(SDU)(2017WLJH48)
文摘Rhenium disulfide(ReS_2), a member of group Ⅶ transition metal dichalcogenides(TMDs), has attracted increasing attention because of its unique distorted 1T structure and electronic and optical properties, which are much different from those of group Ⅵ TMDs(MoS_2, WS_2, MoSe_2, WSe_2, etc.). It has been proved that bulk ReS_2 behaves as a stack of electronically and vibrationally decoupled monolayers, which offers remarkable possibilities to prepare a monolayer ReS_2 facilely and offers a novel platform to study photonic properties of TMDs. However,due to the large and layer-independent bandgap, the nonlinear optical properties of ReS_2 from the visible to midinfrared spectral range have not yet been investigated. Here, the band structure of ReS_2 with the introduction of defects is simulated by the ab initio method, and the results indicate that the bandgap can be reduced from 1.38 to 0.54 eV with the introduction of defects in a suitable range. In the experiment, using a bulk ReS_2 with suitable defects as the raw material, a few-layered broadband ReS_2 saturable absorber(SA) is prepared by the liquid phase exfoliation method. Using the as-prepared ReS_2 SA, passively Q-switched solid-state lasers at wavelengths of 0.64,1.064, and 1.991 μm are investigated systematically. Moreover, with cavity design, a femtosecond passively modelocked laser at 1.06 μm is successfully realized based on the as-prepared ReS_2 SA for the first time. The results present a promising alternative for a rare broadband optical modulator and indicate the potential of ReS_2 in generating Q-switched and mode-locked pulsed lasers. It is further anticipated that this work may be helpful for the design of 2D optoelectronic devices with variable bandgaps.
基金supported by the National Natural Science Foundation of China (Nos. 51025210 and 51422205)the China Scholarship Council in 2014 (No. 201406220045)
文摘Due to the manifestation of fascinating physical phenomena and materials science, two-dimensional（2D） materials have recently attracted enormous research interest with respect to the fields of electronics and optoelectronics.There have been in-depth investigations of the nonlinear properties with respect to saturable absorption, and many 2D materials show potential application in optical switches for passive pulsed lasers. However, the Eigen band-gap determines the responding wavelength band and constrains the applications. In this paper, based on band-gap engineering, some different types of 2D broadband saturable absorbers are reviewed in detail, including molybdenum disulfide（MoS2）, vanadium dioxide（VO2）, graphene, and the Bi2Se3 topological insulator. The results suggest that the band-gap modification should play important roles in 2D broadband saturable materials and can provide some inspiration for the exploration and design of 2D nanodevices.
文摘We report on the successful demonstration of a 150 J nanosecond pulsed cryogenic gas cooled,diode-pumped multi-slab Yb:YAG laser operating at 1 Hz.To the best of our knowledge,this is the highest energy ever recorded for a diodepumped laser system.
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 62165012 and 61665010)Key research and development projects in Gansu Province (Grant No. 21YFIGE300)+5 种基金Gansu Province College Industry Support Plan Project (Grant Nos. 2020C-23 and 2022CYZC-59)Department of Education of Gansu Province: The Education Project of Open Competition for the Best Candidates (Grant No. 2021jyjbgs-06)Gansu Provincial University Innovation Fund Project (Grant No. 2021B-190)Qinzhou District Science and Technology Plan Project (Grant No. 2021-SHFZG1442)Gansu Province College Young Doctor Support Project (Grant No. 2023QB-013)Gansu Province Excellent Graduate Innovation Star Project (Grant No. 2022CXZX796)。
文摘A direct Kerr-lens mode-locked Tm:LuYO_(3)ceramic laser without the aid of any mode-locked starting element is reported for the first time. A pulse duration as short as 259 fs and a maximum average output power of 326 m W are obtained at a repetition rate of 97.1 MHz. The corresponding optical spectrum centered at 2053 nm exhibits a bandwidth of 19.8 nm,which indicates the presence of nearly Fourier transform-limited pulses. Such a Kerr-lens mode-locked Tm:LuYO_(3)ceramic laser is a promising ultrashort pulse source, with both the excellent laser characteristics of Tm:LuYO3and the high-power 790 nm laser diode pumping scheme.
基金Project supported by the National Natural Science Foundation of China(Grant No.61378024)
文摘A transmission-type tungsten disulfide(WS_2)-based saturable absorber(SA) is fabricated and applied to passively Q-switched Nd:YVO_4 laser.The WS_2 nanosheets are deposited on a quartz substrate by the vertical evaporation method.By inserting the WS2 SA into the plano-concave laser cavity,we achieve 153-ns pulses with an average output power of1.19 W at 1064 nm.To the best of our knowledge,both of them are the best results among those obtained by the Q-switched solid-state lasers with WS_2-based absorbers.The repetition rate ranges from 1.176 MHz to 1.578 MHz.As far as we know,it is the first time that MHz level Q-switched pulses have been generated in all solid state lasers based on low-dimensional materials so far.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11974220,61635012,and 51902234)。
文摘A Yb-doped CaF2 transparent ceramics was successfully fabricated by the hot-pressed method and its laser characteristics were studied.A broad tuning performance and mode-locked laser operation were demonstrated in this ceramics for the first time,to our best knowledge.A 60-nm continuous-wavelength tunable laser from 1019 nm to 1079 nm was obtained with a birefringent filter.By employing a semiconductor saturable absorber mirror without additional dispersion compensation elements,a continuous-wave mode-locked laser with pulse duration as short as 575 fs was delivered,at a central wavelength of 1048.5 nm.The oscillator is operated under a repetition rate of 55 MHz.These results indicate that the Yb:CaF2 transparent ceramics is an ideal candidate for the development of ultrafast lasers in the near-infrared regime.
基金supported by the Key Research and Development Project in Zhejiang Province(No.2021C01024).
文摘Stable,efficient and high color rendering index all-inorganic color converters are urgently demanded for white laser diodes.Phosphor-in-glass(PiG),possessing the advantages of phosphors excellent quantum efficiency as well as favorable chemical and thermal stability of glass,has attracted widespread attention.There have been only very few reports of Y_(1.31)Ce_(0.09)Gd_(1.6)Al_(5)O_(12)(Ce:GdYAG)PiG for solid-state laser light-ing.Herein,a series of Ce:GdYAG PiG samples are fabricated by a simple solid-state sintering method.Impressively,the supreme internal quantum efficiency of as-prepared PiG is 91%,which is very close to original phosphors(95%).Furthermore,PiG exhibits a high thermal conductivity(1.844 W m^(−1)K^(−1))and a maximum transparency(62%).Remarkably,by changing the concentration of phosphors and the thickness of PiG samples,a luminous efficacy of 163.5 lm/W,high color rendering index of 74.8 and low correlated color temperature of 4806.8 K are achieved under blue laser irradiation.These results indicate that the Ce:GdYAG PiG samples have shown tremendous application foreground as all-inorganic color converter for solid-state laser lighting.
文摘Erbium fiber lasers of continuous mode outputs and of pulsed picosecond and sub-picosecond pulses train are reported. Compact all solid state passively modulated microchip lasers are also developed to the same degree.
基金supported by the National Natural Science Foundation of China (50902129,51472240,61078076,91122033,and 11304313)the Knowledge Innovation Program of Chinese Academy of Sciences (KJCX2-EW-H03)the Key Laboratory of Functional Crystal Materials and Device (Shandong University,Ministry of Education)
文摘In this paper,we reported a multiwavelength passively Q-switched Yb3+:GdAl3（BO3）4 solid-state laser with topological insulator Bi2Te3 as a saturable absorber（SA） for the first time,to the best of our knowledge.Bi2Te3 nanosheets were prepared by the facile solvothermal method.The influence of three Bi2Te3 densities on the laser operation was compared.The maximum average output power was up to 57 mW with a pulse energy of 511.7 nJ.The shortest pulsewidth was measured to be 370 ns with 110 kHz pulse repetition rate and 40 mW average power.The laser operated at three wavelengths simultaneously at 1043.7,1045.3,and 1046.2 nm,of which the frequency differences were within the terahertz wave band.Our work suggests that solvothermal synthesized Bi2Te3 is a promising SA for simultaneously multiwavelength laser operation.
基金Natural Science Foundation of Jiangsu Province(BK20160221)Natural Science Foundation of Xuzhou,China(KC16SG247)+1 种基金Doctoral Research Funding of Jiangsu Normal University(15XLR024)Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)
文摘We report on broadly wavelength-tunable passive mode-locking with high power operating at the 2 μm water absorption band in a Tm:CYA crystal laser. With a simple quartz plate, stable mode-locking wavelengths can be tuned from 1874 to 1973 nm, with a tunable wavelength range up to ~100 nm and maximum output power up to 1.35 W. The bandwidth is narrow as ~6 GHz, corresponding to a high coherence. To our knowledge, this is the first demonstration of wavelength-tunable mode-locking with watt-level in the 2 μm water absorption band.The high temporal coherent laser can be further applied in spectroscopy, the efficient excitation of molecules, sensing, and quantum optics.
基金supported by the National Natural Science Foundation of China (Nos. 12004208, 51302285, 61675217, and 61975221)Natural Science Foundation of Shanghai (No. 19ZR1479300)+3 种基金Key Research Program of Frontier Science of CAS (No. QYZDB-SSW-JSC041)Program of Shanghai Academic Research Leader (No. 17XD1403900)Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDB16030700)Key Laboratory of Optoelectronic Information Technology, Ministry of Education (Tianjin University)。
文摘Two-dimensional(2 D) Te nanosheets were successfully fabricated through the liquid-phase exfoliation(LPE) method. The nonlinear optical properties of 2 D Te nanosheets were studied by the open-aperture Z-scan technique. Furthermore, the continuous wave mode-locked Nd:YVO4 laser was successfully realized by using 2 D Te as a saturable absorber(SA) for the first time, to the best of our knowledge. Ultrashort pulses as short as 5.8 ps were obtained at 1064.3 nm with an output power of 851 m W. This primary investigation indicates that the 2 D Te SA is a promising photonic device in the fields of ultrafast solid-state lasers.
文摘1 Results The development of tuneable solid-state organic dye lasers is a subject of considerable interest and research activity.Compared to conventional liquid dye lasers they have the advantage of being free of solvent handling,having small size,and being easy to operate.For high-performance solid-state dye lasers highly photo-stable dyes with low quantum yield of triplet formation and low triplet-triplet absorption cross-section in the lasing wavelength region are required.For solid state dye lasers ...
基金supported by the U.S. Department of Energy Accelerator Stewardship programme, Office of High Energy Physics, Office of Science under award DE-SC0016136support by the U.S. Department of Energy, Office of Science SBIR programme under award DE-SC0011375
文摘Recent results in the development of diode-driven high energy, high repetition rate, picosecond lasers, including the demonstration of a cryogenic Yb:YAG active mirror amplifier that produces 1.5 J pulses at 500 Hz repetition rate(0.75 kW average power) are reviewed. These pulses are compressed resulting in the generation of ~5 ps duration,1 J pulses with 0.5 kW average power. A full characterization of this high power cryogenic amplifier, including atwavelength interferometry of the active region under >1 kW average power pump conditions, is presented. An initial demonstration of operation at 1 kW average power(1 J, 1 k Hz) is reported.
基金supported by the Postgraduate Research&Practice Innovation Program of Jiangsu Province(No.KYCX22_3813)the Jiangsu Province Key Research and Development Program(No.BE2022143)+1 种基金the National Natural Science Foundation of China(No.62205133)the Natural Science Foundation of Jiangsu Province(No.BK20190953).
文摘We reporte and demonstrate a solid-state laser to achieve controlled generation of order-switchable cylindrical vector beams(CVBs).In the cavity,a group of vortex wave plates(VWPs)with two quarter-wave plates between the VWPs was utilized to achieve mode conversion and order-switch of CVBs.By utilizing two VWPs of first and third orders,the second and fourth order CVBs were obtained,with mode purities of 96.8%and 94.8%,and sloping efficiencies of 4.45%and 3.06%,respectively.Furthermore,by applying three VWPs of first,second,and third orders,the mode-switchable Gaussian beam,second,fourth,and sixth order CVBs were generated.
基金supported by the National Research Foundation of China(No.61975095)the Young Scholars Program of Shandong University(No.2017WLJH48)+3 种基金the Youth Cross Innovation Group of Shandong University(No.2020QNQT)the Department of Science and Technology of Shandong Province(No.2019JZZY020206)the Natural Science Foundation of Ningbo(No.202003N4099)the Shenzhen Science and Technology Research and Development Funds(No.JCYJ20180305163932273)。
文摘In this paper,the absorption and fluorescence spectra of Er^(3+),Pr^(3+)co-doped LiYF_(4)(Er,Pr:YLF)crystal were measured and analyzed.The Pr^(3+)co-doping was proved to effectively enhance the Er^(3+)∶^(4)I_(11/2)→^(4)I_(13/2)mid-infrared transition at the 2.7μm with 74.1%energy transfer efficiency from Er^(3+)∶^(4)I_(13/2)to Pr^(3+)∶^(3)F_(4).By using the Judd–Ofelt theory,the stimulated emission cross section was calculated to be 1.834×10^(-20)cm^(2)at 2685 nm and 1.359×10^(-20)cm^(2)at 2804.6 nm.Moreover,a diode-end-pumped Er,Pr:YLF laser operating at 2659 nm was realized for the first time,to the best of our knowledge.The maximum output power was determined to be 258 m W with a slope efficiency of 7.4%,and the corresponding beam quality factors m^(2)_x=1.29 and m^(2)_(y)=1.25.Our results suggest that Er,Pr:YLF should be a promising material for 2.7μm laser generation.
基金supported by the National Natural Science Foundation of China (NSFC)(Nos. 11974220 and 61635012)the National Key Research and Development Program of China (No. 2016 YFB0701002)
文摘We report on laser diode(LD) pumped passively Q-switched Yb,Gd:SrF2 lasers with high single-pulse energy for the first time, to the best of our knowledge. In addition, a stable Q-switched laser based on a Cr4+:Y3Al5O12 saturable absorber was demonstrated. The maximum output power of the Q-switched laser obtained was 495 m W, with a pulse width and a pulse repetition rate of 233 ns and 1.238 kHz, respectively. The corresponding single-pulse energy and the peak power were as high as 400 μJ and 1.714 k W. The laser was operated under a transverse electromagnetic mode, and the beam quality was near-diffraction-limited.
基金supported by the National Key Basic Research Program of China(No.2017YFB0405202)National Natural Science Foundation of China(NSFC)(Nos.61705174 and 11774277)+2 种基金Natural Science Basic Research Plan in Shaanxi Province of China(No.2018JQ6061)Open Research Fund of the State Key Laboratory of Pulsed Power Laser TechnologyElectronic Engineering Institute,Hefei,China(No.SKL2017KF04)。
文摘We report on the study of single-mode fiber-laser-pumped mode-locked Yb:CALYO lasers via using a passive saturable absorber and Kerr-lens mode-locking technique,respectively.Up to 3.1-W average power with 103-fs pulse duration is obtained from the passive mode-locking,and down to 36-fs pulse duration with more than 2-W average power is achieved by the pure Kerr-lens mode-locking,which is to the best of our knowledge,the highest average power from a reported sub-40-fs Yb-based solid-state oscillator.
基金supported by the Ministry of National Defense of Poland (No. GBMON/13-992/2018/WAT)。
文摘Detailed power and spectral analysis of a diode-pumped c-cut Pbnm 3 at.% Tm-doped yttrium aluminum perovskite(Tm:YAP) laser in a continuous wave(CW) operation is presented. The laser was experimentally examined in terms of the dependence on the transmittance and radius of curvature of the output coupling mirrors.At room temperature, for an output coupling transmission of 10.8%, the maximum output power of 6.35 W was obtained under a total absorbed pump power of 13.67 W with an optical-to-optical conversion efficiency of 46.5%. The highest slope efficiency of 60.4% was indicated. A detailed spectral analysis was presented. For its dependence on output coupler transmission, the Tm:YAP laser generates wavelengths at approximately 1940 nm or 1990 nm.
基金supported by National Natural Science Foundation of China under Grant No.61405211
文摘Optical damages, which severely degrade the output energy performance of Nd:glass regenerative amplifiers, are discussed in detail in this paper. By a series of experiments, it has been confirmed that these damages result from laser-induced contamination. Based on this work, several improvements are made to boost output energy performance of the regenerative amplifier. The output energy of the regenerative amplifier after improvements declines 4% after 1000 h of operation, much less than it used to, 60% after 560 h of operation.
