Author Affiliations
Abstract
1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2 Songshan Lake Materials Laboratory, Dongguan 523808, China
3 University of Chinese Academy of Sciences, Beijing 100049, China
4 School of Physics and Optoelectronic Engineering, Xidian University, Xi’an 710071, China
Isolated attosecond pulses (IAPs) are generated via applying amplitude gating on high-order harmonic generation driven by carrier-envelope phase stabilized 5.2 fs pulses with 0.5 mJ pulse energy at 770 nm central wavelength at the Synergetic Extreme Condition User Facility. A continuum ranging from 70 to 100 eV that supports sub-100-attosecond pulse is extracted by Zr foil and Mo/Si multilayer mirror. We demonstrate the characterization of the IAP. The retrieved pulse duration is 86 attoseconds. The developed attosecond laser beamline with repetition rate up to 10 kHz is available for users to conduct attosecond photoelectron spectroscopy researches with a capability of coincidence measurement.
amplitude gating coincidence FROG-CRAB high-order harmonic generation isolated attosecond pulses Chinese Optics Letters
2023, 21(11): 113201
Author Affiliations
Abstract
1 School of Physics and Optoelectronic Engineering, Xidian University, Xi’an 710071, China
2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
3 University of Chinese Academy of Sciences, Beijing 100049, China
4 Songshan Lake Materials Laboratory, Dongguan 523808, China
5 CAS Center for Excellence in Ultra-intense Laser Science, Shanghai 201800, China
We report on a high-power diode-pumped (Yb:KGW) mode-locked laser with a semiconductor saturable absorber mirror (SESAM). For 32.7 W of incident pump power, we generate 261 fs pulses with the maximum average output power of up to 13.0 W and spectrum centered around 1039 nm at 68.4 MHz, corresponding to 190 nJ of single pulse energy and 0.72 MW of peak power. The optical-to-optical conversion efficiency is 39.8%, and the slope efficiency is 64.4%. The Yb:KGW laser exhibits a power stability better than 0.543% of the root-mean-square in 2 h.
ultrafast laser high-power femtosecond laser Yb:KGW crystal semiconductor saturable absorber mirror Chinese Optics Letters
2022, 20(2): 021404
Author Affiliations
Abstract
1 School of Physics and Optoelectronic Engineering, Xidian University, Xi’an710071, China
2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing100190, China
3 CAS Center for Excellence in Ultra-intense Laser Science, Shanghai201800, China
4 University of Chinese Academy of Sciences, Beijing100049, China
5 Songshan Lake Materials Laboratory, Dongguan523808, China
We demonstrate a diode-pumped femtosecond Yb:CaGdAlO4 (Yb:CALGO) laser with a semiconductor saturable absorber mirror (SESAM) for stable mode-locking operation. A perfect beam profile is measured under 10 W output power with $M_{x}^{2}$ = 1.017 and $M_{y}^{2}$ = 1.016 in the horizontal and vertical directions, respectively. At the repetition rate of 71.66 MHz, the optical pulse duration is 247 fs and the pulse energy is 140 nJ at the central wavelength of 1041 nm, corresponding to a peak power of 0.56 MW. In addition, we also generate continuous wave (CW) power of more than 15 W with TEM00 mode, corresponding to an optical-to-optical efficiency of 44.1%.
diode pump high power femtosecond oscillator passive mode-locking Yb:CALGO laser High Power Laser Science and Engineering
2021, 9(2): 02000e33
Author Affiliations
Abstract
1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 School of Physics and Optoelectronic Engineering, Xidian University, Xi’an 710071, China
4 Songshan Lake Materials Laboratory, Dongguan 523808, China
5 CAS Center for Excellence in Ultra-intense Laser Science, Shanghai 201800, China
We demonstrate nonlinear pulse compression of an 8 kHz Nd: picosecond laser using the multi-pass-cell (MPC) technique with fused silica as the nonlinear medium. The pulse duration is compressed from 12.5 ps to 601 fs, corresponding to a pulse shortening factor of 20.8. The output pulse energy is 154 μJ with an efficiency of 74.5%. To the best of our knowledge, this is the highest pulse compression ratio achieved in a single-stage MPC with bulk material as the nonlinear medium. The laser power stability and the beam quality () before and after the MPC are also experimentally studied. Both the laser power stability and the beam quality are barely deteriorated by the MPC device.
multi-pass cell Nd:YVO4 compression ratio femtosecond laser Chinese Optics Letters
2021, 19(9): 093201
Author Affiliations
Abstract
1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 Songshan Lake Materials Laboratory, Dongguan 523808, China
4 School of Physics and Optoelectronic Engineering, Xidian University, Xi’an 710071, China
We demonstrate a harmonically pumped femtosecond optical parametric oscillator (OPO) laser using a frequency-doubled mode-locked Yb:KGW laser at a repetition rate of 75.5 MHz as the pump laser. Based on a bismuth borate nonlinear crystal, repetition rates up to 1.13 GHz are realized, which is 15 times that of the pump laser. The signal wavelength is tunable from 700 nm to 887 nm. The maximum power of the signal is 207 mW at the central wavelength of 750 nm and the shortest pulse duration is 117 fs at 780 nm. The beam quality (M2 factor) in the horizontal and vertical directions of the output beam are 1.077 and 1.141, respectively.
GHz femtosecond laser optical parametric oscillator tunable wavelength Chinese Optics Letters
2020, 18(3): 033201
1 中讯邮电咨询设计院有限公司,河南 郑州 450007
2 中国移动通信集团公司 河南分公司,河南 郑州 450008
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