We present an effective approach to realize a highly efficient,high-power and chirped pulse amplification-free ultrafast ytterbium-doped yttrium aluminum garnet thin-disk regenerative amplifier pumped by a zero-phonon...We present an effective approach to realize a highly efficient,high-power and chirped pulse amplification-free ultrafast ytterbium-doped yttrium aluminum garnet thin-disk regenerative amplifier pumped by a zero-phonon line 969 nm laser diode.The amplifier delivers an output power exceeding 154 W at a pulse repetition rate of 1 MHz with custom-designed 48 pump passes.The exceptional thermal management on the thin disk through high-quality bonding,efficient heat dissipation and a fully locked spectrum collectively contributes to achieving a remarkable optical-to-optical efficiency of 61%and a near-diffraction-limit beam quality with an M2 factor of 1.06.To the best of our knowledge,this represents the highest conversion efficiency reported in ultrafast thin-disk regenerative amplifiers.Furthermore,the amplifier operates at room temperature and exhibits exceptional stability,with root mean square stability of less than 0.33%.This study significantly represents advances in the field of laser amplification systems,particularly in terms of efficiency and average power.This advantageous combination of high efficiency and diffraction limitation positions the thin-disk regenerative amplifier as a promising solution for a wide range of scientific and industrial applications.展开更多
A diode dual-end-pumped Nd：YVO4 regenerative amplifier is reported. The influence of the cavity stability on the performance of the regenerative amplifier is studied. The experimental results match well with the anal...A diode dual-end-pumped Nd：YVO4 regenerative amplifier is reported. The influence of the cavity stability on the performance of the regenerative amplifier is studied. The experimental results match well with the analysis at high pump power. The mode locking seed pulses with 15 ps pulse width and 10 nJ single pulse energy at 86 MHz are amplified up to 4.7 mJ at 1 kHz, corresponding to the maximum amplification about 0.5 x 106, by our regenerative amplifier. And an average power of 4.7 W is obtained at the repetition rate from 1 kHz to 10 kHz.展开更多
A high efficiency compact Yb:KGW regenerative amplifier using an all-fiber laser seed source was comprehensively studied.With thermal lensing effect compensated by the cavity design,the compressed pulses with energy o...A high efficiency compact Yb:KGW regenerative amplifier using an all-fiber laser seed source was comprehensively studied.With thermal lensing effect compensated by the cavity design,the compressed pulses with energy of 1 mJ at 1 kHz and 0.4 mJ at 10 kHz in sub-400-fs pulse duration using chirped fiber Bragg grating(CFBG)stretcher were demonstrated.A modified Frantz-Nodvik equation was developed to emulate the dynamic behavior of the regenerative amplifier.The simulation results were in good agreement with the experiment.Numerical simulations and experimental results show that the scheme can be scalable to higher energy of multi-mJ,sub-300 fs pulses.展开更多
We theoretically study the nonlinear compression of a 20-rnJ, 1030-nm picosecond chirped pulse from the thin-disk amplifier in a krypton gas-filled hollow-core fiber. The chirp from the thin-disk amplifier system has ...We theoretically study the nonlinear compression of a 20-rnJ, 1030-nm picosecond chirped pulse from the thin-disk amplifier in a krypton gas-filled hollow-core fiber. The chirp from the thin-disk amplifier system has little influence on the initial pulse, however, it shows an effect on the nonlinear compression in hollow-core fiber. We use a large diameter hollow waveguide to restrict undesirable nonlinear effects such as ionization; on the other hand, we employ suitable gas pressure and fiber length to promise enough spectral broadening; with 600-μm, 6-bar (1 bar = 105 Pa), 1.8-m hollow fiber, we obtain 31.5-fs pulse. Moreover, we calculate and discuss the optimal fiber lengths and gas pressures with different initial durations induced by different grating compression angles for reaching a given bandwidth. These results are meaningful for a compression scheme from picoseconds to femtoseconds.展开更多
When this article was originally published in High Power Laser Science and Engineering it contained an error in the name of the author Jiandong Liu.This has now been fixed.The publisher apologises for this error.
This study develops a Yb:KGW dual-crystal based regenerative amplifier.The thermal lensing and gain-narrowing effects are compensated by the dual-crystal configuration.Sub-nanojoule pulses are amplified to 1.5 mJ with...This study develops a Yb:KGW dual-crystal based regenerative amplifier.The thermal lensing and gain-narrowing effects are compensated by the dual-crystal configuration.Sub-nanojoule pulses are amplified to 1.5 mJ with 9 nm spectral bandwidth and 1 kHz repetition rate using chirped pulse amplification technology.Consequently,1.2 m J pulses with a pulse duration of 227 fs are obtained after compression.Thanks to the cavity design,the output laser was a near diffraction limited beam with M2 around 1.1.The amplifier has the potential to boost energy above 2 m J after compression and act as a front end for a future kilohertz terawatt-class diode-pumped Yb:KGW laser system.展开更多
We report on a high-repetition-rate,high-power continuously pumped Nd:GdVO4 regenerative amplifier.Numerical simulations successfully pinpoint the optimum working point free of bifurcation instability with simultaneou...We report on a high-repetition-rate,high-power continuously pumped Nd:GdVO4 regenerative amplifier.Numerical simulations successfully pinpoint the optimum working point free of bifurcation instability with simultaneous efficient energy extraction.At a repetition rate of 100 kHz,a maximum output power of 23 W was obtained with a pulse duration of 27 ps,corresponding to a pulse energy of 230 μJ.The system displayed an outstanding stability with a root mean square power noise as low as 0.3%.The geometry of the optical resonator and the pumping scheme enhanced output power in the TEM00 mode with a single bulk crystal.Accordingly,nearly diffraction-limited beam quality was produced with M2≈1.2 at full pump power.展开更多
In this paper we report a compact and robust regenerative amplifier developed as the pump laser for a high repetition rate terahertz parametric amplifier.With properly chosen pump source and carefully designed cavity...In this paper we report a compact and robust regenerative amplifier developed as the pump laser for a high repetition rate terahertz parametric amplifier.With properly chosen pump source and carefully designed cavity,Nd∶YVO4 crystal,and laser beam collimator,a maximum output pulse energy of 480μJ has been achieved at the repetition rate of 10 kHz.The output laser has a nearly Gaussian transverse profile and a narrow bandwidth of 0.2 nm.Longterm monitoring shows an root mean square power fluctuation of about 1%.These characteristics satisfy all requirements for high repetition rate terahertz parametric amplifier.展开更多
A diode pumped high energy Yb∶YAG rod regenerative amplifier was demonstrated with a maximum energy of22.3 m J,excellent energy stability(~0.8%root mean square),and beam quality(M2<1.2)at 10 Hz repetition rate.To ...A diode pumped high energy Yb∶YAG rod regenerative amplifier was demonstrated with a maximum energy of22.3 m J,excellent energy stability(~0.8%root mean square),and beam quality(M2<1.2)at 10 Hz repetition rate.To the best of our knowledge,this is the highest energy so far obtained by a Yb∶YAG rod regenerative amplifier.展开更多
We report on an improved ytterbium-doped yttrium aluminum garnet thin-disk multi-pass amplifier for kilowatt-level ultrafast lasers,showcasing excellent beam quality.At a repetition rate of 800 kHz,the 6.8 ps,276 W se...We report on an improved ytterbium-doped yttrium aluminum garnet thin-disk multi-pass amplifier for kilowatt-level ultrafast lasers,showcasing excellent beam quality.At a repetition rate of 800 kHz,the 6.8 ps,276 W seed laser is amplified up to an average power of 1075 W,corresponding to a pulse energy of 1.34 mJ.The 36-pass amplifier is designed as a compact mirror array in which the beam alternately propagates between the mirrors and the disk by a quasi-collimated state.We adopted a quasi-collimated propagation to confine stray and diffracted light by the slight curvature of the disk,which enables us to achieve an outstanding extraction efficiency of up to 57%with excellent beam quality in stable laser operation at high power.The beam quality at 1075 W was measured to be M^(2)<1.51.Furthermore,stability testing was demonstrated with a root-mean-square power fiuctuation of less than 1.67%for 10 min.展开更多
基金This work was supported by the National Key Research and Development Program of China(2022YFB3605800)National Natural Science Foundation of China(62275174,62105225,61975136,61935014)+3 种基金Shenzhen University Stability Support Project(20220719104008001)Natural Science Foundation of Top Talent of Shenzhen Technology University(GDRC202106)Pingshan Special Funds for Scientific and Technological Innovation(PSKG202003,PSKG202007)Special Project of Self-made Experimental Instruments and Equipment of Shenzhen Technology University(JSZZ202201014).
文摘We present an effective approach to realize a highly efficient,high-power and chirped pulse amplification-free ultrafast ytterbium-doped yttrium aluminum garnet thin-disk regenerative amplifier pumped by a zero-phonon line 969 nm laser diode.The amplifier delivers an output power exceeding 154 W at a pulse repetition rate of 1 MHz with custom-designed 48 pump passes.The exceptional thermal management on the thin disk through high-quality bonding,efficient heat dissipation and a fully locked spectrum collectively contributes to achieving a remarkable optical-to-optical efficiency of 61%and a near-diffraction-limit beam quality with an M2 factor of 1.06.To the best of our knowledge,this represents the highest conversion efficiency reported in ultrafast thin-disk regenerative amplifiers.Furthermore,the amplifier operates at room temperature and exhibits exceptional stability,with root mean square stability of less than 0.33%.This study significantly represents advances in the field of laser amplification systems,particularly in terms of efficiency and average power.This advantageous combination of high efficiency and diffraction limitation positions the thin-disk regenerative amplifier as a promising solution for a wide range of scientific and industrial applications.
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 50721004 and 60978032)
文摘A diode dual-end-pumped Nd：YVO4 regenerative amplifier is reported. The influence of the cavity stability on the performance of the regenerative amplifier is studied. The experimental results match well with the analysis at high pump power. The mode locking seed pulses with 15 ps pulse width and 10 nJ single pulse energy at 86 MHz are amplified up to 4.7 mJ at 1 kHz, corresponding to the maximum amplification about 0.5 x 106, by our regenerative amplifier. And an average power of 4.7 W is obtained at the repetition rate from 1 kHz to 10 kHz.
基金Project supported by Major Program of the National Natural Science Foundation of China (Grant No. 12034020)the National Natural Science Foundation of China (Grant No. 61805274)+1 种基金the National Key R&D Program of China (Grant No. 2018YFB1107201)the Synergic Extreme Condition User Facility
文摘A high efficiency compact Yb:KGW regenerative amplifier using an all-fiber laser seed source was comprehensively studied.With thermal lensing effect compensated by the cavity design,the compressed pulses with energy of 1 mJ at 1 kHz and 0.4 mJ at 10 kHz in sub-400-fs pulse duration using chirped fiber Bragg grating(CFBG)stretcher were demonstrated.A modified Frantz-Nodvik equation was developed to emulate the dynamic behavior of the regenerative amplifier.The simulation results were in good agreement with the experiment.Numerical simulations and experimental results show that the scheme can be scalable to higher energy of multi-mJ,sub-300 fs pulses.
基金Project supported by the National Basic Research Program of China(Grant No.2011CB808101)the Funds from the Chinese Academy of Sciences,and the National Natural Science Foundation of China(Grant Nos.11127901,10734080,61221064,60908008,and 61078037)
文摘We theoretically study the nonlinear compression of a 20-rnJ, 1030-nm picosecond chirped pulse from the thin-disk amplifier in a krypton gas-filled hollow-core fiber. The chirp from the thin-disk amplifier system has little influence on the initial pulse, however, it shows an effect on the nonlinear compression in hollow-core fiber. We use a large diameter hollow waveguide to restrict undesirable nonlinear effects such as ionization; on the other hand, we employ suitable gas pressure and fiber length to promise enough spectral broadening; with 600-μm, 6-bar (1 bar = 105 Pa), 1.8-m hollow fiber, we obtain 31.5-fs pulse. Moreover, we calculate and discuss the optimal fiber lengths and gas pressures with different initial durations induced by different grating compression angles for reaching a given bandwidth. These results are meaningful for a compression scheme from picoseconds to femtoseconds.
文摘When this article was originally published in High Power Laser Science and Engineering it contained an error in the name of the author Jiandong Liu.This has now been fixed.The publisher apologises for this error.
基金supported by the Natural Science Foundation of Top Talent of SZTU(Nos.2019010801001 and 202024555101039)。
文摘This study develops a Yb:KGW dual-crystal based regenerative amplifier.The thermal lensing and gain-narrowing effects are compensated by the dual-crystal configuration.Sub-nanojoule pulses are amplified to 1.5 mJ with 9 nm spectral bandwidth and 1 kHz repetition rate using chirped pulse amplification technology.Consequently,1.2 m J pulses with a pulse duration of 227 fs are obtained after compression.Thanks to the cavity design,the output laser was a near diffraction limited beam with M2 around 1.1.The amplifier has the potential to boost energy above 2 m J after compression and act as a front end for a future kilohertz terawatt-class diode-pumped Yb:KGW laser system.
基金supported by the Ministry of Science and Technology of the People’s Republic of China(MOST)(No.2017YFB0405202)
文摘We report on a high-repetition-rate,high-power continuously pumped Nd:GdVO4 regenerative amplifier.Numerical simulations successfully pinpoint the optimum working point free of bifurcation instability with simultaneous efficient energy extraction.At a repetition rate of 100 kHz,a maximum output power of 23 W was obtained with a pulse duration of 27 ps,corresponding to a pulse energy of 230 μJ.The system displayed an outstanding stability with a root mean square power noise as low as 0.3%.The geometry of the optical resonator and the pumping scheme enhanced output power in the TEM00 mode with a single bulk crystal.Accordingly,nearly diffraction-limited beam quality was produced with M2≈1.2 at full pump power.
文摘In this paper we report a compact and robust regenerative amplifier developed as the pump laser for a high repetition rate terahertz parametric amplifier.With properly chosen pump source and carefully designed cavity,Nd∶YVO4 crystal,and laser beam collimator,a maximum output pulse energy of 480μJ has been achieved at the repetition rate of 10 kHz.The output laser has a nearly Gaussian transverse profile and a narrow bandwidth of 0.2 nm.Longterm monitoring shows an root mean square power fluctuation of about 1%.These characteristics satisfy all requirements for high repetition rate terahertz parametric amplifier.
文摘A diode pumped high energy Yb∶YAG rod regenerative amplifier was demonstrated with a maximum energy of22.3 m J,excellent energy stability(~0.8%root mean square),and beam quality(M2<1.2)at 10 Hz repetition rate.To the best of our knowledge,this is the highest energy so far obtained by a Yb∶YAG rod regenerative amplifier.
基金supported by the National Key Research and Development Program of China(2022YFB3605800)National Natural Science Foundation of China(62105225,62275174,61975136,61935014)+3 种基金Shenzhen University Stability Support Project(20220719104008001)Natural Science Foundation of Top Talent of Shenzhen Technology University(GDRC202106)Pingshan Special Funds for Scientific and Technological Innovation(PSKG202003,PSKG202007)Guangdong Provincial Engineering Technology Research Center for Materials for Advanced MEMS Sensor Chip(2022GCZX005)。
文摘We report on an improved ytterbium-doped yttrium aluminum garnet thin-disk multi-pass amplifier for kilowatt-level ultrafast lasers,showcasing excellent beam quality.At a repetition rate of 800 kHz,the 6.8 ps,276 W seed laser is amplified up to an average power of 1075 W,corresponding to a pulse energy of 1.34 mJ.The 36-pass amplifier is designed as a compact mirror array in which the beam alternately propagates between the mirrors and the disk by a quasi-collimated state.We adopted a quasi-collimated propagation to confine stray and diffracted light by the slight curvature of the disk,which enables us to achieve an outstanding extraction efficiency of up to 57%with excellent beam quality in stable laser operation at high power.The beam quality at 1075 W was measured to be M^(2)<1.51.Furthermore,stability testing was demonstrated with a root-mean-square power fiuctuation of less than 1.67%for 10 min.
