A stable Q-switched erbium doped fiber laser emitting at 1558 nm is demonstrated using a cadmium selenide(CdSe) material coated onto a side-polished D-shape fiber as the saturable absorber(SA). By elevating the input ...A stable Q-switched erbium doped fiber laser emitting at 1558 nm is demonstrated using a cadmium selenide(CdSe) material coated onto a side-polished D-shape fiber as the saturable absorber(SA). By elevating the input pump power from the threshold of 91 mW to the maximum available power of 136 mW, a pulse train with a maximum repetition rate of 57.44 kHz, minimum pulse width of 3.76 us, maximum average output power of7.99 mW, maximum pulse energy of 0.1391 uJ, and maximum peak power of 36.99 mW are obtained. The signalto-noise ratio of the spectrum is measured to be around 75 dB. This CdSe based SA is simple, robust, and reliable,and thus suitable for making a portable pulse laser source.展开更多
A mode-locked erbium doped fiber laser(EDFL) is demonstrated using the vanadium oxide(V_2O_5) material as a saturable absorber(SA). The V_2O_5 based SA is hosted into poly ethylene oxide film and attached on fiber fer...A mode-locked erbium doped fiber laser(EDFL) is demonstrated using the vanadium oxide(V_2O_5) material as a saturable absorber(SA). The V_2O_5 based SA is hosted into poly ethylene oxide film and attached on fiber ferule in the laser cavity. It shows 7% modulation depth with 71 MW/cm^2 saturation intensity. By incorporating the SA inside the EDFL cavity with managed intra-cavity dispersion, ultrashort soliton pulses are successfully generated with a full width at half maximum of 3.14 ps. The laser operated at central wavelength of 1559.25 nm and repetition frequency of 1 MHz.展开更多
We demonstrate an ultrafast fiber laser based on transition metal dichalcogenide materials which are tungsten disulfide(WS2) and molybdenum disulfide(MoS_2) as saturable absorber(SA). These materials are fabricated vi...We demonstrate an ultrafast fiber laser based on transition metal dichalcogenide materials which are tungsten disulfide(WS2) and molybdenum disulfide(MoS_2) as saturable absorber(SA). These materials are fabricated via a simple drop-casting method. By employing WS_2, we obtain a stable harmonic mode-locking at the threshold pump power of 184 mW, and the generated soliton pulse has 3.48 MHz of repetition rate. At the maximum pump power of 250 mW, we also obtain a small value of pulse duration, 2.43 ps with signal-to-noise ratio(SNR) of 57 dB.For MoS_2 SA, the pulse is generated at 105 mW pump power with repetition rate of 1.16 MHz. However, the pulse duration cannot be detected by the autocorrelator device as the pulse duration recorded is 468 ns, with the SNR value of 35 dB.展开更多
We demonstrate a Q-switched Raman fiber laser using molybdenum disulfide(MoS_2) as a saturable absorber(SA).The SA is assembled by depositing a mechanically exfoliated MoS_2 onto a fiber ferrule facet before it is mat...We demonstrate a Q-switched Raman fiber laser using molybdenum disulfide(MoS_2) as a saturable absorber(SA).The SA is assembled by depositing a mechanically exfoliated MoS_2 onto a fiber ferrule facet before it is matched with another clean ferrule via a connector.It is inserted in a Raman fiber laser cavity with a total cavity length of about 8 km to generate a Q-switching pulse train operating at 1560.2 nm.A 7.7-km-long dispersion compensating fiber with 584 ps·nm^(-1)km^(-1) of dispersion is used as a nonlinear gain medium.As the pump power is increased from 395 mW to 422 mW,the repetition rate of the Q-switching pulses can be increased from 132.7 to137.4kHz while the pulse width is concurrently decreased from 3.35μs to 3.03μs.The maximum pulse energy of 54.3nJ is obtained at the maximum pump power of 422 mW.These results show that the mechanically exfoliated MoS_2 SA has a great potential to be used for puise generation in Raman fiber laser systems.展开更多
We demonstrate the generation of a Q-switching pulse train in an erbium-doped fiber laser(EDFL) cavity using a newly developed cadmium selenide(CdSe) based saturable absorber(SA). The SA is obtained by embedding CdSe ...We demonstrate the generation of a Q-switching pulse train in an erbium-doped fiber laser(EDFL) cavity using a newly developed cadmium selenide(CdSe) based saturable absorber(SA). The SA is obtained by embedding CdSe nanomaterials into a polymethyl methacrylate(PMMA) microfiber. It is incorporated into an EDFL cavity to generate a Q-switched laser operating at 1533.6 nm. The repetition rates of the produced pulse train are tunable within 37-64 kHz as the pump power is varied from 34 mW to 74 mW. The corresponding pulse width reduces from 7.96μs to 4.84μs, and the maximum pulse energy of 1.16 nJ is obtained at the pump power of74 mW.展开更多
This work reports on the use of the holmium oxide(Ho_2 O_3) polymer film as a saturable absorber(SA) for generating stable Q-switching pulses operating in a 2-μm region in a thulium-doped fiber laser cavity. The SA i...This work reports on the use of the holmium oxide(Ho_2 O_3) polymer film as a saturable absorber(SA) for generating stable Q-switching pulses operating in a 2-μm region in a thulium-doped fiber laser cavity. The SA is prepared by diluting a commercial Ho_3 O_2 powder and then mixing it with polyvinyl alcohol(PVA) solution to form a Ho_2 O_3-PVA film. A tiny part of the film about 1 mm×1 mm in size is sandwiched between two fiber ferrules with the help of index matching gel. When incorporated in a laser cavity driven by a 1552-nm pump,stable Q-switching pulses are observed at 1955 nm within the pump power range of 363-491 mW. As the pump power increases within this range, the repetition rate rises from 26 kHz to 39 kHz, as the pulse width drops from4.22μs to 2.57μs. The laser operates with a signal-to-noise ratio of 47 dB, and the maximum output power and the pulse energy obtained are 2.67 mW and 69 nJ, respectively. Our results successfully demonstrate that the Ho_2 O_3 film can be used as a passive SA to generate a 2-μm pulse laser.展开更多
We demonstrate a Q-switched ytterbium-doped fiber laser(YDFL) using a newly developed multi-layer black phosphorous(BP) saturable absorber(SA).The BP SA is prepared by mechanically exfoliating a BP crystal and stickin...We demonstrate a Q-switched ytterbium-doped fiber laser(YDFL) using a newly developed multi-layer black phosphorous(BP) saturable absorber(SA).The BP SA is prepared by mechanically exfoliating a BP crystal and sticking the acquired BP flakes onto a scotch tape.A small piece of the tape is then placed between two ferrules and incorporated in a YDFL cavity to achieve a stable Q-switched operation in a 1.0 μm region.The laser has a pump threshold of 55.1 mW,a puise repetition rate that is tunable from 8.2 to 32.9kHz,and the narrowest pulse width of 10.8 μs.The highest pulse energy of 328 nJ is achieved at the pump power of 97.6mW.Our results show that multi-layer BP is a promising SA for Q-switching laser operation.展开更多
We present an all-fiber dual-wavelength holmium-doped fiber laser operating in 2 μm region using a newly developed holmium-doped fiber(HDF) as a gain medium.The proposed fiber laser is constructed by using a hybrid g...We present an all-fiber dual-wavelength holmium-doped fiber laser operating in 2 μm region using a newly developed holmium-doped fiber(HDF) as a gain medium.The proposed fiber laser is constructed by using a hybrid gain medium,i.e.,a thulium-ytterbium co-doped fiber(TYDF) and an HDF in conjunction with a simple half-opened linear cavity,which is formed by a broadband mirror and an output coupler reflector.Without the HDF,the TYDF laser operates at wavelengths of 1991 and 1999 nm with a signal-to-noise ratio of more than 34 dB and the slope efficiency of 26.16%.With the HDF,dual-wavelength output lines are obtained at 2075 and 2083 nm with signal-to-noise ratios of more than 17 dB,3dB bandwidth of less than 0.2 nm and the power difference between the two peaks of less than 1 dB at the TYDF laser pump power of 320 mW.展开更多
We demonstrate the generation of passive mode-locked double-clad ytterbium-doped fiber laser operating in a1-micron region.We prepare the saturable absorber from commercial crystal of molybdenum disulphide(MoS_2).With...We demonstrate the generation of passive mode-locked double-clad ytterbium-doped fiber laser operating in a1-micron region.We prepare the saturable absorber from commercial crystal of molybdenum disulphide(MoS_2).Without chemical procedure,the MoS_2 is mechanically exfoliated by using a clear scotch tape.A few layers of M0S2 flakes are obtained on the tape.Then,a piece of 1 × 1 mm tape containing MoS_2 thin Bakes is inserted between two fiber ferruJes and is integrated in the ring cavity.Stable mode-locking operation is attained at1090 nm with a repetition rate of 13.2MHz.Our mode-locked laser has a maximum output power of 20 mW with1.48 nJ pulse energy.These results validate that the M0S2 has a broad operating wavelength which covers the1-micron region,and it is also able to work in a high-power cavity.展开更多
We demonstrate a Q-switched erbium-doped fiber laser(EDFL) using a newly developed zinc oxide-(ZnO) based saturable absorber(SA). The SA is fabricated by embedding a prepared ZnO powder into a poly(vinyl alcohol)film....We demonstrate a Q-switched erbium-doped fiber laser(EDFL) using a newly developed zinc oxide-(ZnO) based saturable absorber(SA). The SA is fabricated by embedding a prepared ZnO powder into a poly(vinyl alcohol)film. A small piece of the film is then sandwiched between two fiber ferrules and is incorporated in an EDFL cavity for generating a stable Q-switching pulse train. The EDFL operates at 1560.4 nm with a pump power threshold of 11.8 mW, a pulse repetition rate tunable from 22.79 to 61.43 kHz, and the smallest pulse width of 7.00 μs. The Q-switching pulse shows no spectral modulation with a peak-to-pedestal ratio of 62 dB indicating the high stability of the laser. These results show that the ZnO powder has a great potential to be used for pulsed laser applications.展开更多
We demonstrate the generation of Q-switched pulses from an ytterbium-doped fiber laser(YDFL) using quantum dot(QD) CdSe as a passive saturable absorber(SA). The CdSe QD is fabricated by the synthesis of CdO,Se, and ma...We demonstrate the generation of Q-switched pulses from an ytterbium-doped fiber laser(YDFL) using quantum dot(QD) CdSe as a passive saturable absorber(SA). The CdSe QD is fabricated by the synthesis of CdO,Se, and manganese acetate and paraffin oil and oleic acid as the solvent and surfactant, respectively. The CdSe QD is then doped into poly-methyl-methacrylate(PMMA) via an emulsion polymerization process. A PMMAhosted CdSe QD thin flake with a homogeneous end surface is then formed and placed between two ferrules and assembled in a YDFL cavity to achieve the Q-switching operation with a repetition rate of 24.45 to 40.50 kHz while varying the pump power from 975 to 1196 mW. The pulse width changes from 6.78 to 3.65 μs with a maximum calculated pulse energy at 0.77 μJ at a pump power of 1101 mW. This work may be the first demonstration of CdSe QD-based Q-switching in an all-fiber configuration that should give proportional insight into semiconductor QD materials in photonics applications.展开更多
We demonstrate a femtosecond mode-locked erbium-doped fiber laser(EDFL) using a nickel oxide(Ni O) as a saturable absorber(SA). Ni O nanoparticles are hosted into polyethylene oxide film and attached to fiber ferrule ...We demonstrate a femtosecond mode-locked erbium-doped fiber laser(EDFL) using a nickel oxide(Ni O) as a saturable absorber(SA). Ni O nanoparticles are hosted into polyethylene oxide film and attached to fiber ferrule in the laser cavity. The Ni O-SA shows a 39% modulation depth with a 0.04 MW∕cm^2 saturation intensity. Our ring laser cavity based on erbium-doped active fiber with managed intracavity dispersion has the ability to generate ultrashort pulses with a full width at half-maximum(FWHM) of around 2.85 nm centered at 1561.8 nm.The pulses repeat at a frequency of 0.96 MHz and duration of 950 fs.展开更多
We demonstrate the generation of mode-locked pulses in an erbium-doped fiber laser(EDFL) by using a new manganese-doped cadmium selenide quantum-dots-based saturable absorber. The laser produces a soliton pulse train ...We demonstrate the generation of mode-locked pulses in an erbium-doped fiber laser(EDFL) by using a new manganese-doped cadmium selenide quantum-dots-based saturable absorber. The laser produces a soliton pulse train operating at 1561.1 nm with a repetition rate of 1 MHz, as the pump power is varied from 113 to 250 m W.At the maximum pump power, we obtain the pulse duration of 459 ns with a signal-to-noise ratio of 50 dB.展开更多
文摘A stable Q-switched erbium doped fiber laser emitting at 1558 nm is demonstrated using a cadmium selenide(CdSe) material coated onto a side-polished D-shape fiber as the saturable absorber(SA). By elevating the input pump power from the threshold of 91 mW to the maximum available power of 136 mW, a pulse train with a maximum repetition rate of 57.44 kHz, minimum pulse width of 3.76 us, maximum average output power of7.99 mW, maximum pulse energy of 0.1391 uJ, and maximum peak power of 36.99 mW are obtained. The signalto-noise ratio of the spectrum is measured to be around 75 dB. This CdSe based SA is simple, robust, and reliable,and thus suitable for making a portable pulse laser source.
文摘A mode-locked erbium doped fiber laser(EDFL) is demonstrated using the vanadium oxide(V_2O_5) material as a saturable absorber(SA). The V_2O_5 based SA is hosted into poly ethylene oxide film and attached on fiber ferule in the laser cavity. It shows 7% modulation depth with 71 MW/cm^2 saturation intensity. By incorporating the SA inside the EDFL cavity with managed intra-cavity dispersion, ultrashort soliton pulses are successfully generated with a full width at half maximum of 3.14 ps. The laser operated at central wavelength of 1559.25 nm and repetition frequency of 1 MHz.
基金Supported by the University of Malaya under Grant No PG173-2015B
文摘We demonstrate an ultrafast fiber laser based on transition metal dichalcogenide materials which are tungsten disulfide(WS2) and molybdenum disulfide(MoS_2) as saturable absorber(SA). These materials are fabricated via a simple drop-casting method. By employing WS_2, we obtain a stable harmonic mode-locking at the threshold pump power of 184 mW, and the generated soliton pulse has 3.48 MHz of repetition rate. At the maximum pump power of 250 mW, we also obtain a small value of pulse duration, 2.43 ps with signal-to-noise ratio(SNR) of 57 dB.For MoS_2 SA, the pulse is generated at 105 mW pump power with repetition rate of 1.16 MHz. However, the pulse duration cannot be detected by the autocorrelator device as the pulse duration recorded is 468 ns, with the SNR value of 35 dB.
文摘We demonstrate a Q-switched Raman fiber laser using molybdenum disulfide(MoS_2) as a saturable absorber(SA).The SA is assembled by depositing a mechanically exfoliated MoS_2 onto a fiber ferrule facet before it is matched with another clean ferrule via a connector.It is inserted in a Raman fiber laser cavity with a total cavity length of about 8 km to generate a Q-switching pulse train operating at 1560.2 nm.A 7.7-km-long dispersion compensating fiber with 584 ps·nm^(-1)km^(-1) of dispersion is used as a nonlinear gain medium.As the pump power is increased from 395 mW to 422 mW,the repetition rate of the Q-switching pulses can be increased from 132.7 to137.4kHz while the pulse width is concurrently decreased from 3.35μs to 3.03μs.The maximum pulse energy of 54.3nJ is obtained at the maximum pump power of 422 mW.These results show that the mechanically exfoliated MoS_2 SA has a great potential to be used for puise generation in Raman fiber laser systems.
文摘We demonstrate the generation of a Q-switching pulse train in an erbium-doped fiber laser(EDFL) cavity using a newly developed cadmium selenide(CdSe) based saturable absorber(SA). The SA is obtained by embedding CdSe nanomaterials into a polymethyl methacrylate(PMMA) microfiber. It is incorporated into an EDFL cavity to generate a Q-switched laser operating at 1533.6 nm. The repetition rates of the produced pulse train are tunable within 37-64 kHz as the pump power is varied from 34 mW to 74 mW. The corresponding pulse width reduces from 7.96μs to 4.84μs, and the maximum pulse energy of 1.16 nJ is obtained at the pump power of74 mW.
文摘This work reports on the use of the holmium oxide(Ho_2 O_3) polymer film as a saturable absorber(SA) for generating stable Q-switching pulses operating in a 2-μm region in a thulium-doped fiber laser cavity. The SA is prepared by diluting a commercial Ho_3 O_2 powder and then mixing it with polyvinyl alcohol(PVA) solution to form a Ho_2 O_3-PVA film. A tiny part of the film about 1 mm×1 mm in size is sandwiched between two fiber ferrules with the help of index matching gel. When incorporated in a laser cavity driven by a 1552-nm pump,stable Q-switching pulses are observed at 1955 nm within the pump power range of 363-491 mW. As the pump power increases within this range, the repetition rate rises from 26 kHz to 39 kHz, as the pulse width drops from4.22μs to 2.57μs. The laser operates with a signal-to-noise ratio of 47 dB, and the maximum output power and the pulse energy obtained are 2.67 mW and 69 nJ, respectively. Our results successfully demonstrate that the Ho_2 O_3 film can be used as a passive SA to generate a 2-μm pulse laser.
基金Supported by the University of Malaya under Grant No PG100-2014B
文摘We demonstrate a Q-switched ytterbium-doped fiber laser(YDFL) using a newly developed multi-layer black phosphorous(BP) saturable absorber(SA).The BP SA is prepared by mechanically exfoliating a BP crystal and sticking the acquired BP flakes onto a scotch tape.A small piece of the tape is then placed between two ferrules and incorporated in a YDFL cavity to achieve a stable Q-switched operation in a 1.0 μm region.The laser has a pump threshold of 55.1 mW,a puise repetition rate that is tunable from 8.2 to 32.9kHz,and the narrowest pulse width of 10.8 μs.The highest pulse energy of 328 nJ is achieved at the pump power of 97.6mW.Our results show that multi-layer BP is a promising SA for Q-switching laser operation.
基金Supported by the University of Malaya under Grant No PG175-2015B
文摘We present an all-fiber dual-wavelength holmium-doped fiber laser operating in 2 μm region using a newly developed holmium-doped fiber(HDF) as a gain medium.The proposed fiber laser is constructed by using a hybrid gain medium,i.e.,a thulium-ytterbium co-doped fiber(TYDF) and an HDF in conjunction with a simple half-opened linear cavity,which is formed by a broadband mirror and an output coupler reflector.Without the HDF,the TYDF laser operates at wavelengths of 1991 and 1999 nm with a signal-to-noise ratio of more than 34 dB and the slope efficiency of 26.16%.With the HDF,dual-wavelength output lines are obtained at 2075 and 2083 nm with signal-to-noise ratios of more than 17 dB,3dB bandwidth of less than 0.2 nm and the power difference between the two peaks of less than 1 dB at the TYDF laser pump power of 320 mW.
基金Supported by the PPP Grant Scheme of University of Malaya under Grant No PG098-2014B
文摘We demonstrate the generation of passive mode-locked double-clad ytterbium-doped fiber laser operating in a1-micron region.We prepare the saturable absorber from commercial crystal of molybdenum disulphide(MoS_2).Without chemical procedure,the MoS_2 is mechanically exfoliated by using a clear scotch tape.A few layers of M0S2 flakes are obtained on the tape.Then,a piece of 1 × 1 mm tape containing MoS_2 thin Bakes is inserted between two fiber ferruJes and is integrated in the ring cavity.Stable mode-locking operation is attained at1090 nm with a repetition rate of 13.2MHz.Our mode-locked laser has a maximum output power of 20 mW with1.48 nJ pulse energy.These results validate that the M0S2 has a broad operating wavelength which covers the1-micron region,and it is also able to work in a high-power cavity.
基金Supported by the University of Malaya under Grant No PG173-2015B
文摘We demonstrate a Q-switched erbium-doped fiber laser(EDFL) using a newly developed zinc oxide-(ZnO) based saturable absorber(SA). The SA is fabricated by embedding a prepared ZnO powder into a poly(vinyl alcohol)film. A small piece of the film is then sandwiched between two fiber ferrules and is incorporated in an EDFL cavity for generating a stable Q-switching pulse train. The EDFL operates at 1560.4 nm with a pump power threshold of 11.8 mW, a pulse repetition rate tunable from 22.79 to 61.43 kHz, and the smallest pulse width of 7.00 μs. The Q-switching pulse shows no spectral modulation with a peak-to-pedestal ratio of 62 dB indicating the high stability of the laser. These results show that the ZnO powder has a great potential to be used for pulsed laser applications.
文摘We demonstrate the generation of Q-switched pulses from an ytterbium-doped fiber laser(YDFL) using quantum dot(QD) CdSe as a passive saturable absorber(SA). The CdSe QD is fabricated by the synthesis of CdO,Se, and manganese acetate and paraffin oil and oleic acid as the solvent and surfactant, respectively. The CdSe QD is then doped into poly-methyl-methacrylate(PMMA) via an emulsion polymerization process. A PMMAhosted CdSe QD thin flake with a homogeneous end surface is then formed and placed between two ferrules and assembled in a YDFL cavity to achieve the Q-switching operation with a repetition rate of 24.45 to 40.50 kHz while varying the pump power from 975 to 1196 mW. The pulse width changes from 6.78 to 3.65 μs with a maximum calculated pulse energy at 0.77 μJ at a pump power of 1101 mW. This work may be the first demonstration of CdSe QD-based Q-switching in an all-fiber configuration that should give proportional insight into semiconductor QD materials in photonics applications.
文摘We demonstrate a femtosecond mode-locked erbium-doped fiber laser(EDFL) using a nickel oxide(Ni O) as a saturable absorber(SA). Ni O nanoparticles are hosted into polyethylene oxide film and attached to fiber ferrule in the laser cavity. The Ni O-SA shows a 39% modulation depth with a 0.04 MW∕cm^2 saturation intensity. Our ring laser cavity based on erbium-doped active fiber with managed intracavity dispersion has the ability to generate ultrashort pulses with a full width at half-maximum(FWHM) of around 2.85 nm centered at 1561.8 nm.The pulses repeat at a frequency of 0.96 MHz and duration of 950 fs.
基金supported by the Ministry of Higher Education Malaysia Grant Scheme(FRGS/1/2015/SG02/UITM/03/3)
文摘We demonstrate the generation of mode-locked pulses in an erbium-doped fiber laser(EDFL) by using a new manganese-doped cadmium selenide quantum-dots-based saturable absorber. The laser produces a soliton pulse train operating at 1561.1 nm with a repetition rate of 1 MHz, as the pump power is varied from 113 to 250 m W.At the maximum pump power, we obtain the pulse duration of 459 ns with a signal-to-noise ratio of 50 dB.
