The bound solitons in a passively mode-locked fibre ring laser are observed and their formation mechanism is summarized in this paper. In order to obtain stable bound solitons, a strong CW laser field at the centre of...The bound solitons in a passively mode-locked fibre ring laser are observed and their formation mechanism is summarized in this paper. In order to obtain stable bound solitons, a strong CW laser field at the centre of the soliton spectral is necessary to suppress and synchronize the random soliton phase variations.展开更多
We demonstrate a passively harmonic mode-locked（PHML） fiber laser operating at the L-band using carbon nanotubes polyvinyl alcohol（CNTs-PVA） film. Under suitable pump power and an appropriate setting of the polari...We demonstrate a passively harmonic mode-locked（PHML） fiber laser operating at the L-band using carbon nanotubes polyvinyl alcohol（CNTs-PVA） film. Under suitable pump power and an appropriate setting of the polarization controller（PC）, the 54^（th） harmonic pulses at the L-band are generated with the side mode suppression ratio（SMSR） better than 44 dB and a repetition frequency of 503.37 MHz. Further increasing the pump power leads to a higher frequency of 550 MHz with compromised stability of 38.5 dB SMSR. To the best of our knowledge, this is the first demonstration on the generation of L-band PHML pulses from an Er-doped fiber laser based on CNTs.展开更多
A stable passively mode-locked laser of Nd^3＋：Gd0.5Y2.5Al5O12（Nd：GYAG） disordered crystal is experimentally investigated both using Z-type and W-type cavities with a semiconductor saturable absorbed mirror.The co...A stable passively mode-locked laser of Nd^3＋：Gd0.5Y2.5Al5O12（Nd：GYAG） disordered crystal is experimentally investigated both using Z-type and W-type cavities with a semiconductor saturable absorbed mirror.The continuous-wave mode-locked threshold of the absorbed pump power is just 1.8 W.The maximum average output power is 210 mW,which is obtained at the absorbed pump power of 2.3 W.The pulse width is measured to be11.1 ps assuming a Gaussian shape.展开更多
In this linear-cavity passively mode-locked laser based on semiconductor saturable absorber mirror, an Ybdoped fiber is shared by two branch cavities as gain medium. These two cavities can respectively output single-w...In this linear-cavity passively mode-locked laser based on semiconductor saturable absorber mirror, an Ybdoped fiber is shared by two branch cavities as gain medium. These two cavities can respectively output single-wavelength pulse with the wavelength tuning range of 1 009.~1 057.6 nm and 1 011.6-1 052.6 nm by adjusting volume Bragg grating. When two cavities output pulses together, the dual-wavelength pulses with the maximum and minimum wavelength separation of 34.8 and 2.4 nm, respectively, are achieved by net gain equalization method to suppress mode competition at room temperature. The maximum pulse energies of dual-wavelength pulses are 0.47 and 0.33 nJ separately; their repetition rates are 11.39 and 11.41 MHz.展开更多
We experimentally demonstrate a diode-pumped passively mode-locked femtosecond laser with yb3＋-doped yttrium lanthanum oxide ceramic. Mode-locking is achieved by using a semiconductor saturable absorber mirror, and i...We experimentally demonstrate a diode-pumped passively mode-locked femtosecond laser with yb3＋-doped yttrium lanthanum oxide ceramic. Mode-locking is achieved by using a semiconductor saturable absorber mirror, and intraeavity dispersion is compensated by a pair of SF6 prisms. Laser pulses as short as 357 fs at a central wavelength of 1 075 nm are obtained. The maximum average output power is 670 mW under 4.5 W of pumping power with a slope efficiency of 20%. To the best of our knowledge, this is the shortest pulse generated from Yb-doped yttrium lanthanum oxide ceramic lasers with a sub-500 fs pulse duration.展开更多
We report the demonstration of passively continuous-wave mode-locking （CWML） of diode-pumped Tm,Ho：YVO4 laser using an InGaAs/GaAs multiple quantum-well （MQW） structure semiconductor as the saturable absorber. St...We report the demonstration of passively continuous-wave mode-locking （CWML） of diode-pumped Tm,Ho：YVO4 laser using an InGaAs/GaAs multiple quantum-well （MQW） structure semiconductor as the saturable absorber. Stable mode-locking pulses at the central wavelength of 2 041 nm are obtained. The maximum output power is 151 roW. The pulse duration is 10.5 ps at the repetition rate of 64.3 MHz.展开更多
A stable self-starting mode-locked Nd：YVO4 laser with a Herriott-type multiple-pass cavity （MPC） oper- ating at 1 064 nm is demonstrated. An in-band 880-nm laser diode is used as an end-pump and a semi- conductor s...A stable self-starting mode-locked Nd：YVO4 laser with a Herriott-type multiple-pass cavity （MPC） oper- ating at 1 064 nm is demonstrated. An in-band 880-nm laser diode is used as an end-pump and a semi- conductor saturable absorber mirror （SESAM） is used for passive mode locking （ML） and providing pulse durations of 14 ps. At a pump power of 26.4 W, the maximum average output power is as high as 10.5 W at a repetition rate of 22 MHz, which corresponds to a single pulse energy of 0.48 #J. Optical-to-optical conversion efficiency is as high as 39.8~ at the maximum output power with a slope efficiency of 55.2%.展开更多
We report, for the first time to our knowledge, a diode-end-pumped passively mode-locked（ML） Nd-doped gadolinium gallium garnet laser based on a chemically reduced graphene oxide（RGO） saturable absorber mirror. Th...We report, for the first time to our knowledge, a diode-end-pumped passively mode-locked（ML） Nd-doped gadolinium gallium garnet laser based on a chemically reduced graphene oxide（RGO） saturable absorber mirror. The ML laser gives a pulse duration of 15.1 ps under the maximum average output power of 1.44 W, corresponding to a slope efficiency of 21.1%. The single-pulse energy and peak power are 21.6 n J and 1.43 k W, respectively. The results indicate that our RGO saturable absorber has promising prospects for applications in high-power and high-efficiency ultrafast lasers.展开更多
We demonstrate the dissipative soliton mode locking in a diode pumped Yb：GdYSiO^（Yb：GYSO） laser operating in the positive dispersion regime. We obtain stable passively mode-locked pulses with strong positive chirp...We demonstrate the dissipative soliton mode locking in a diode pumped Yb：GdYSiO^（Yb：GYSO） laser operating in the positive dispersion regime. We obtain stable passively mode-locked pulses with strong positive chirp and with very steep spectral edges. The central wavelength is 1050 nm with bandwidth of about 4 nm, autocorrelation trace shown the typical pulse duration is about 3.5 ps. We obtain the maximum average power of 558 mW for a 3.3-W absorbed pump power, with 22% slope efficiency, and a 78-MHz pulse repetition frequency.展开更多
We investigate the effects of a piece of zero-dispersion fiber （ZDF） on the pulse dynamics of a passively mode-locked fiber laser operating in the stretched-pulse regime. Numerical simulation suggests that the prope...We investigate the effects of a piece of zero-dispersion fiber （ZDF） on the pulse dynamics of a passively mode-locked fiber laser operating in the stretched-pulse regime. Numerical simulation suggests that the proper location and length of ZDF facilitate spectrum broadening and pulse shortening in fiber lasers while maintaining constant net cavity dispersion. A nonlinear polarization evolution mode-locked Er-doped fiber laser with a dispersion map is built based on the simulation. Larger optical spectrum broadening is obtained by inserting a longer ZDF after the active fiber during single-pulse operation, which well agrees with the simulation.展开更多
基金Project supported by the Tianjin Key Project Foundation of China （Grant No 033183611） the National Natural Science Foundation of China （Grant No 60137010）, and the National High Technology Research and Development Program of China （Grant No 2003AA312100）.
文摘The bound solitons in a passively mode-locked fibre ring laser are observed and their formation mechanism is summarized in this paper. In order to obtain stable bound solitons, a strong CW laser field at the centre of the soliton spectral is necessary to suppress and synchronize the random soliton phase variations.
基金Project supported by the National Natural Science Foundation of China(Grant No.61605107)Young Eastern Scholar Program at Shanghai Institutions of Higher Learning,China(Grant No.QD2015027)+2 种基金the“Young 1000 Talent Plan”Program of Chinathe Open Program of the State Key Laboratory of Advanced Optical Communication Systems and Networks at Shanghai Jiaotong University,China(Grant No.2017GZKF17)RAEng/The Leverhulme Trust Senior Research Fellowships(Grant No.LTSRF1617/13/57).
文摘We demonstrate a passively harmonic mode-locked（PHML） fiber laser operating at the L-band using carbon nanotubes polyvinyl alcohol（CNTs-PVA） film. Under suitable pump power and an appropriate setting of the polarization controller（PC）, the 54^（th） harmonic pulses at the L-band are generated with the side mode suppression ratio（SMSR） better than 44 dB and a repetition frequency of 503.37 MHz. Further increasing the pump power leads to a higher frequency of 550 MHz with compromised stability of 38.5 dB SMSR. To the best of our knowledge, this is the first demonstration on the generation of L-band PHML pulses from an Er-doped fiber laser based on CNTs.
基金supported by the Promotive Research Fund for Outstanding Young and Middle-Aged Scientists of Shandong Province(No.BS2014DX001)the Fundamental Research Funds for the Central Universities(No.15CX02058A)the Foundation of Shandong Province Natural Science(No.ZR2015FM018)
文摘A stable passively mode-locked laser of Nd^3＋：Gd0.5Y2.5Al5O12（Nd：GYAG） disordered crystal is experimentally investigated both using Z-type and W-type cavities with a semiconductor saturable absorbed mirror.The continuous-wave mode-locked threshold of the absorbed pump power is just 1.8 W.The maximum average output power is 210 mW,which is obtained at the absorbed pump power of 2.3 W.The pulse width is measured to be11.1 ps assuming a Gaussian shape.
文摘In this linear-cavity passively mode-locked laser based on semiconductor saturable absorber mirror, an Ybdoped fiber is shared by two branch cavities as gain medium. These two cavities can respectively output single-wavelength pulse with the wavelength tuning range of 1 009.~1 057.6 nm and 1 011.6-1 052.6 nm by adjusting volume Bragg grating. When two cavities output pulses together, the dual-wavelength pulses with the maximum and minimum wavelength separation of 34.8 and 2.4 nm, respectively, are achieved by net gain equalization method to suppress mode competition at room temperature. The maximum pulse energies of dual-wavelength pulses are 0.47 and 0.33 nJ separately; their repetition rates are 11.39 and 11.41 MHz.
基金supported by the National Natural Science Foundation of China (Nos. 10874237, 10804128,and 60808007)the National "863" Program of China(No. 2011AA030205)the Fundamental Research Funds for the Central Universities (No. K50511050001)
文摘We experimentally demonstrate a diode-pumped passively mode-locked femtosecond laser with yb3＋-doped yttrium lanthanum oxide ceramic. Mode-locking is achieved by using a semiconductor saturable absorber mirror, and intraeavity dispersion is compensated by a pair of SF6 prisms. Laser pulses as short as 357 fs at a central wavelength of 1 075 nm are obtained. The maximum average output power is 670 mW under 4.5 W of pumping power with a slope efficiency of 20%. To the best of our knowledge, this is the shortest pulse generated from Yb-doped yttrium lanthanum oxide ceramic lasers with a sub-500 fs pulse duration.
基金supported by the National Natural Science Foundation of China(Nos.60878011 and 61078008)the Program for New Century Excellent Talents in University(No.NCET-10-0067)
文摘We report the demonstration of passively continuous-wave mode-locking （CWML） of diode-pumped Tm,Ho：YVO4 laser using an InGaAs/GaAs multiple quantum-well （MQW） structure semiconductor as the saturable absorber. Stable mode-locking pulses at the central wavelength of 2 041 nm are obtained. The maximum output power is 151 roW. The pulse duration is 10.5 ps at the repetition rate of 64.3 MHz.
基金supported by the National "973" Program of China(No.2011CB808101)the National Natural Science Foundation of China(No.11127901)
文摘A stable self-starting mode-locked Nd：YVO4 laser with a Herriott-type multiple-pass cavity （MPC） oper- ating at 1 064 nm is demonstrated. An in-band 880-nm laser diode is used as an end-pump and a semi- conductor saturable absorber mirror （SESAM） is used for passive mode locking （ML） and providing pulse durations of 14 ps. At a pump power of 26.4 W, the maximum average output power is as high as 10.5 W at a repetition rate of 22 MHz, which corresponds to a single pulse energy of 0.48 #J. Optical-to-optical conversion efficiency is as high as 39.8~ at the maximum output power with a slope efficiency of 55.2%.
基金supported by the National Natural Science Foundation of China(Nos.61308042 and 51321091)the Project of Shandong Province Higher Educational Science and Technology Program(No.J11L13)the Key Laboratory of Functional Crystal Materials and Device(Shandong University),Ministry of Education(No.KF1207)
文摘We report, for the first time to our knowledge, a diode-end-pumped passively mode-locked（ML） Nd-doped gadolinium gallium garnet laser based on a chemically reduced graphene oxide（RGO） saturable absorber mirror. The ML laser gives a pulse duration of 15.1 ps under the maximum average output power of 1.44 W, corresponding to a slope efficiency of 21.1%. The single-pulse energy and peak power are 21.6 n J and 1.43 k W, respectively. The results indicate that our RGO saturable absorber has promising prospects for applications in high-power and high-efficiency ultrafast lasers.
基金supported by the National"973"Program of China(No.2013CB922402)the National Key Scientific Instruments Development Program of China(No.2012YQ120047)the National Natural Science Foundation of China(No.61205130)
文摘We demonstrate the dissipative soliton mode locking in a diode pumped Yb：GdYSiO^（Yb：GYSO） laser operating in the positive dispersion regime. We obtain stable passively mode-locked pulses with strong positive chirp and with very steep spectral edges. The central wavelength is 1050 nm with bandwidth of about 4 nm, autocorrelation trace shown the typical pulse duration is about 3.5 ps. We obtain the maximum average power of 558 mW for a 3.3-W absorbed pump power, with 22% slope efficiency, and a 78-MHz pulse repetition frequency.
基金supported by the National Key Basic Research Special Foundation of China(Nos.2011CB808101 and 2010CB327604)the National Natural Science Foundation of China(Nos.60838004,60678012,60978022,61078028,61205131,and11274239)+2 种基金the New Century Excellent Talents(No.NCET-07-0597)the Doctoral Program Foundation of Institution of Higher Education of China(No.20090032110050)the National"111"Project of China(No.B07014)
文摘We investigate the effects of a piece of zero-dispersion fiber （ZDF） on the pulse dynamics of a passively mode-locked fiber laser operating in the stretched-pulse regime. Numerical simulation suggests that the proper location and length of ZDF facilitate spectrum broadening and pulse shortening in fiber lasers while maintaining constant net cavity dispersion. A nonlinear polarization evolution mode-locked Er-doped fiber laser with a dispersion map is built based on the simulation. Larger optical spectrum broadening is obtained by inserting a longer ZDF after the active fiber during single-pulse operation, which well agrees with the simulation.
