The wavelength-tunable and switchable narrow bandwidth mode-locking operation is demonstrated in an all fiber laser based on semiconductor-saturable absorber mirror （SESAM）. Two narrow-band fiber Bragg gratings cent...The wavelength-tunable and switchable narrow bandwidth mode-locking operation is demonstrated in an all fiber laser based on semiconductor-saturable absorber mirror （SESAM）. Two narrow-band fiber Bragg gratings centered at 1029.9nm and 1032nm respectively with a polarization controller inserted between them are used to realize the wavelength switchable between 1029.9nm and 1032nm. The laser delivers different pulse widths of 7.5ps for 1030nm and 20ps for 1032nm. The maximum output power for both could reach -6.5mW at single pulse operation. The output wavelength couM be tuned to about 0.gnm intervals ranging from 1030.2nm to 1031.1 nm and from 1032.15nm to 1033.7nm with the temperature change of the fiber Bragg grating, respectively.展开更多
We report on a tandem-pumped actively Q-switched fiber laser system emitting at 1120 nm.Parasitic oscillation is challenging in Yb-doped Q-switched 1120-nm fiber laser,which is suppressed by pumping with a fiber laser...We report on a tandem-pumped actively Q-switched fiber laser system emitting at 1120 nm.Parasitic oscillation is challenging in Yb-doped Q-switched 1120-nm fiber laser,which is suppressed by pumping with a fiber laser at 1018 nm.At least four times improvement in output peak power is demonstrated in a single laser setup with 1018-nm fiber laser pumping instead of 976-nm laser diode pumping.This is,to the best of our knowledge,the first demonstration of a tandem-pumped Q-switched fiber laser.展开更多
A single frequency photonic bandgap fiber amplifier at 11 78nm is iuvestigated experimentally and numerically.With a pump power of 81 W, a single frequency 1178nm fiber laser of 10.3 W is obtained with a 3 W seed lase...A single frequency photonic bandgap fiber amplifier at 11 78nm is iuvestigated experimentally and numerically.With a pump power of 81 W, a single frequency 1178nm fiber laser of 10.3 W is obtained with a 3 W seed laser and a 20m gain fiber. Numerical simulation is conducted with a rate equation model taking amplified spontaneous emission and stimulated Brillouin scattering （SBS） into consideration. Temperature distribution along the fiber is applied for SBS suppression, more than 50 W single frequeney fiber laser at 1178 nm is predicted theoreticall.v with a 5 W seed laser and a 40m long gain fiber with five temperature steps.展开更多
The wavelength-tunable rectangular mode-locking operation is demonstrated in an all-fiber laser based on semi- conductor saturable absorber mirror. As the dissipative soliton resonance signature, the pulse duration va...The wavelength-tunable rectangular mode-locking operation is demonstrated in an all-fiber laser based on semi- conductor saturable absorber mirror. As the dissipative soliton resonance signature, the pulse duration varies from 5SOps to 2.1 ns as a function o~ the increasing pump power. Correspondingly, the maximum pulse energy is 9.11 n3. Moreover, it is found that the wavelength tunable operation with a range of approximately 10 nm could be obtained by properly adjusting the polarization controllers. The characteristics of the rectangular pulses at different wavelengths are similar to each other. The demonstration of the wavelength tunable rectangular pulses would be beneficial to some applications for many fields such as spectroscopy and sensing research.展开更多
Ultrafast Raman fiber laser has been proved to be an effective method to obtain ultrafast optical pulses at special wavelength.Yet,compared with conventional rareearth doped counterparts,it is challenging for Raman fi...Ultrafast Raman fiber laser has been proved to be an effective method to obtain ultrafast optical pulses at special wavelength.Yet,compared with conventional rareearth doped counterparts,it is challenging for Raman fiber lasers to generate pulses with high pulse energy and short pulse duration.Here,we review three categories of ultrafast Raman fiber laser technologies and give detailed discussions on the advantages and challenges of each.In regards to mode-locking,different saturable-absorbers-based fiber lasers are compared and their common problem resulting from long cavity length are discussed.In terms of synchronously-pumping,several approaches to match the repetition rate of pulsed pump with the length of Raman fiber cavity are discussed,while the technical complexity of each method is analyzed.Moreover,the recently developed technology termed as nonlinear optical gain modulation(NOGM)is introduced,which turns out to be a simple and quality solution to generate highenergy femtosecond pulses with wavelength agility.Compared with the others,NOGM gathers various advantages including simple structure,long-term stability,high pulse energy and short pulse duration,which may effectively promote application expansion of ultrafast Raman fiber laser in the near future.展开更多
A high power continuous-wave single-frequency green fiber laser by second-harmonic generation of a Yb-doped fiber amplifier（YDFA）is developed.A linearly polarized single-mode fiber amplifier produces a 60 W infrared...A high power continuous-wave single-frequency green fiber laser by second-harmonic generation of a Yb-doped fiber amplifier（YDFA）is developed.A linearly polarized single-mode fiber amplifier produces a 60 W infrared laser at 1064 nm with a 103 W incident diode pump laser at 976 nm,corresponding to an optical conversion efficiency of 58%.An external bow-tie enhancement cavity incorporating a noncritically phase-matched lithium triborate crystal is employed for second-harmonic generation.A 33.2 W laser at 532 nm is obtained with a 45 W incident 1064 nm fundamental laser,corresponding to a conversion efficiency of 74%.展开更多
In this Letter, a simple and passively mode-locking Yb-doped all fiber laser using a nonlinear polarization ro- tation technique operating under dissipative soliton （DS） or dissipative soliton resonance （DSR） cond...In this Letter, a simple and passively mode-locking Yb-doped all fiber laser using a nonlinear polarization ro- tation technique operating under dissipative soliton （DS） or dissipative soliton resonance （DSR） conditions is proposed. Furthermore, using a combination of a bandpass filter and a Loyt filter, tunable single-wavelength or dual-wavelength operation under two different conditions is realized, respectively. The tunable single- wavelength DS laser has a 5 nm tuning range from 1029 to 1034 nm with a pulse width of 110 ps. The tunable single-wavelength DSR operation laser has a range of 4 nm. In-depth research on the mechanism of the con- version between DS and DSR is carried out. Particularly, under dual-wavelength DSR operation, the obtained step-like pulses consist of two rectangular pulses with different energies. This work could help give a deeper insight into normal dispersion pulses.展开更多
基金Supported by the National High Technology Research and Development Program of China under Grant No 2014AA041901NSAF Foundation of the National Natural Science Foundation of China under Grant No U1330134+1 种基金the Opening Project of Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques under Grant No 2012ADL02the National Natural Science Foundation of China under Grant Nos 61308024 and 11174305
文摘The wavelength-tunable and switchable narrow bandwidth mode-locking operation is demonstrated in an all fiber laser based on semiconductor-saturable absorber mirror （SESAM）. Two narrow-band fiber Bragg gratings centered at 1029.9nm and 1032nm respectively with a polarization controller inserted between them are used to realize the wavelength switchable between 1029.9nm and 1032nm. The laser delivers different pulse widths of 7.5ps for 1030nm and 20ps for 1032nm. The maximum output power for both could reach -6.5mW at single pulse operation. The output wavelength couM be tuned to about 0.gnm intervals ranging from 1030.2nm to 1031.1 nm and from 1032.15nm to 1033.7nm with the temperature change of the fiber Bragg grating, respectively.
文摘We report on a tandem-pumped actively Q-switched fiber laser system emitting at 1120 nm.Parasitic oscillation is challenging in Yb-doped Q-switched 1120-nm fiber laser,which is suppressed by pumping with a fiber laser at 1018 nm.At least four times improvement in output peak power is demonstrated in a single laser setup with 1018-nm fiber laser pumping instead of 976-nm laser diode pumping.This is,to the best of our knowledge,the first demonstration of a tandem-pumped Q-switched fiber laser.
文摘A single frequency photonic bandgap fiber amplifier at 11 78nm is iuvestigated experimentally and numerically.With a pump power of 81 W, a single frequency 1178nm fiber laser of 10.3 W is obtained with a 3 W seed laser and a 20m gain fiber. Numerical simulation is conducted with a rate equation model taking amplified spontaneous emission and stimulated Brillouin scattering （SBS） into consideration. Temperature distribution along the fiber is applied for SBS suppression, more than 50 W single frequeney fiber laser at 1178 nm is predicted theoreticall.v with a 5 W seed laser and a 40m long gain fiber with five temperature steps.
基金Supported by the National High-Technology Research and Development Program of China under Grant No 2014AA041901the NSAF Foundation of National Natural Science Foundation of China under Grant No U1330134+1 种基金the Opening Project of Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques under Grant No 2012ADL02the National Natural Science Foundation of China under Grant No 61308024
文摘The wavelength-tunable rectangular mode-locking operation is demonstrated in an all-fiber laser based on semi- conductor saturable absorber mirror. As the dissipative soliton resonance signature, the pulse duration varies from 5SOps to 2.1 ns as a function o~ the increasing pump power. Correspondingly, the maximum pulse energy is 9.11 n3. Moreover, it is found that the wavelength tunable operation with a range of approximately 10 nm could be obtained by properly adjusting the polarization controllers. The characteristics of the rectangular pulses at different wavelengths are similar to each other. The demonstration of the wavelength tunable rectangular pulses would be beneficial to some applications for many fields such as spectroscopy and sensing research.
基金supported by Youth Innovation Promotion Association,Chinese Academy of Sciences(No.2022247)National Natural Science Foundation of China(No.62075226,62175244)+1 种基金Natural Science Foundation of Shanghai(No.21ZR1472200)Youth Innovation Promotion Association,Chinese Academy of Sciences,2022247,Jiaqi Zhou,National Natural Science Foundation of China,62075226,Yan Feng,62175244,Jiaqi Zhou,Natural Science Foundation of Shanghai,21ZR1472200,Jiaqi Zhou.
文摘Ultrafast Raman fiber laser has been proved to be an effective method to obtain ultrafast optical pulses at special wavelength.Yet,compared with conventional rareearth doped counterparts,it is challenging for Raman fiber lasers to generate pulses with high pulse energy and short pulse duration.Here,we review three categories of ultrafast Raman fiber laser technologies and give detailed discussions on the advantages and challenges of each.In regards to mode-locking,different saturable-absorbers-based fiber lasers are compared and their common problem resulting from long cavity length are discussed.In terms of synchronously-pumping,several approaches to match the repetition rate of pulsed pump with the length of Raman fiber cavity are discussed,while the technical complexity of each method is analyzed.Moreover,the recently developed technology termed as nonlinear optical gain modulation(NOGM)is introduced,which turns out to be a simple and quality solution to generate highenergy femtosecond pulses with wavelength agility.Compared with the others,NOGM gathers various advantages including simple structure,long-term stability,high pulse energy and short pulse duration,which may effectively promote application expansion of ultrafast Raman fiber laser in the near future.
文摘A high power continuous-wave single-frequency green fiber laser by second-harmonic generation of a Yb-doped fiber amplifier（YDFA）is developed.A linearly polarized single-mode fiber amplifier produces a 60 W infrared laser at 1064 nm with a 103 W incident diode pump laser at 976 nm,corresponding to an optical conversion efficiency of 58%.An external bow-tie enhancement cavity incorporating a noncritically phase-matched lithium triborate crystal is employed for second-harmonic generation.A 33.2 W laser at 532 nm is obtained with a 45 W incident 1064 nm fundamental laser,corresponding to a conversion efficiency of 74%.
基金supported in part by the National High Technology Research and Development Program of China (No.2014AA041901)the NSAF Foundation of National Natural Science Foundation of China(No.U1330134)+2 种基金the project of Shandong Province Higher Educational Scienceand Technology Program(No.J13LJ06)the National Natural Science Foundation of China(No.61308024)the National Natural Science Fund(No.11174305)
文摘In this Letter, a simple and passively mode-locking Yb-doped all fiber laser using a nonlinear polarization ro- tation technique operating under dissipative soliton （DS） or dissipative soliton resonance （DSR） conditions is proposed. Furthermore, using a combination of a bandpass filter and a Loyt filter, tunable single-wavelength or dual-wavelength operation under two different conditions is realized, respectively. The tunable single- wavelength DS laser has a 5 nm tuning range from 1029 to 1034 nm with a pulse width of 110 ps. The tunable single-wavelength DSR operation laser has a range of 4 nm. In-depth research on the mechanism of the con- version between DS and DSR is carried out. Particularly, under dual-wavelength DSR operation, the obtained step-like pulses consist of two rectangular pulses with different energies. This work could help give a deeper insight into normal dispersion pulses.
