In some applications of broadband ultrafast spectroscopy, such as surface sum frequency generation vibrational spectroscopy, femtosecond stimulated Raman spectroscopy (SRS), and coherent anti-Stokes Raman spectroscopy, a narrowband picosecond pulse is required to obtain a high spectral resolution. Here, we present a method to generate narrowband picosecond second harmonic (SH) and fundamental frequency (FF) pulses with high-conversion efficiency from a Ti:sapphire femtosecond laser amplifier. The narrowband picosecond SH pulse was generated based on the group velocity mismatch between the SH and FF pulses in a nonlinear crystal of β-barium borate (BBO). The small SH nonlinear optical coefficient was optimized by changing the azimuth angle of a thick BBO crystal, successfully avoiding the saturation effect in the SH generation process. The SH pulse was then used to pump an optical parametric amplifier to efficiently amplify the narrowband FF seed pulse, which was obtained with an etalon by spectrally filtering the output from the femtosecond laser amplifier. Dual-wavelength output, which could be very useful in femtosecond SRS, was also realized.
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August 2021
Research Article|
August 05 2021
Efficient generation of narrowband picosecond pulses from a femtosecond laser
Xinting Liu;
Xinting Liu
1
School of Dayu Zhang, Dalian University of Technology
, Dalian 116024, China
2
State Key Laboratory of Molecular Reaction Dynamics and Dynamics Research Center for Energy and Environmental Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences
, Dalian 116023, China
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Bo-Han Li;
Bo-Han Li
2
State Key Laboratory of Molecular Reaction Dynamics and Dynamics Research Center for Energy and Environmental Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences
, Dalian 116023, China
3
University of Chinese Academy of Science
, 19 A Yuquan Road, Beijing 100049, People’s Republic of China
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Yu Liang;
Yu Liang
2
State Key Laboratory of Molecular Reaction Dynamics and Dynamics Research Center for Energy and Environmental Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences
, Dalian 116023, China
3
University of Chinese Academy of Science
, 19 A Yuquan Road, Beijing 100049, People’s Republic of China
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Wen Zeng;
Wen Zeng
2
State Key Laboratory of Molecular Reaction Dynamics and Dynamics Research Center for Energy and Environmental Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences
, Dalian 116023, China
3
University of Chinese Academy of Science
, 19 A Yuquan Road, Beijing 100049, People’s Republic of China
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Huang Li
;
Huang Li
2
State Key Laboratory of Molecular Reaction Dynamics and Dynamics Research Center for Energy and Environmental Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences
, Dalian 116023, China
4
Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China
, Hefei 230026, China
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Chuanyao Zhou;
Chuanyao Zhou
2
State Key Laboratory of Molecular Reaction Dynamics and Dynamics Research Center for Energy and Environmental Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences
, Dalian 116023, China
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Zefeng Ren
;
Zefeng Ren
a)
2
State Key Laboratory of Molecular Reaction Dynamics and Dynamics Research Center for Energy and Environmental Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences
, Dalian 116023, China
a)Author to whom correspondence should be addressed: [email protected]
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Xueming Yang
Xueming Yang
2
State Key Laboratory of Molecular Reaction Dynamics and Dynamics Research Center for Energy and Environmental Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences
, Dalian 116023, China
5
Department of Chemistry, Southern University of Science and Technology
, 1088 Xueyuan Road, Guangdong, Shenzhen 518055, China
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a)Author to whom correspondence should be addressed: [email protected]
Rev. Sci. Instrum. 92, 083001 (2021)
Article history
Received:
May 06 2021
Accepted:
July 27 2021
Citation
Xinting Liu, Bo-Han Li, Yu Liang, Wen Zeng, Huang Li, Chuanyao Zhou, Zefeng Ren, Xueming Yang; Efficient generation of narrowband picosecond pulses from a femtosecond laser. Rev. Sci. Instrum. 1 August 2021; 92 (8): 083001. https://doi.org/10.1063/5.0056050
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