Chinese Journal of Quantum Electronics ›› 2022, Vol. 39 ›› Issue (4): 566-573.doi: 10.3969/j.issn.1007-5461.2022.04.011

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Study on femtosecond chirped-pulse amplification based on concentric stretcher

YANG Hao1,2, TENG Hao2,4∗, LYU Renchong1,2, ZHU Jiangfeng1∗, WEI Zhiyi2,3,4   

  1. ( 1 School of Physics and Optoelectronic Engineering, Xidian University, Xi’an 710126, China; 2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; 3 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China; 4 Songshan Lake Materials Laboratory, Dongguan 523808, China )
  • Received:2021-01-11 Revised:2021-03-02 Published:2022-07-28 Online:2022-07-28

Abstract: The matching of time domain stretcher and compressor is the key to obtain high contrast femtosecond pulse in chirped-pulse amplification (CPA) laser system. Compared with the conventional Martinez type stretcher and ¨Offner type stretcher, the stretcher based on concentric structure can eliminate the effect of higher-order dispersion induced by aberration due to the fact that the object is completely coincident with the image, and can further realize better pulse compression with double grating compressor. The concentric stretcher, which consists of a transmission grating pair and a concave mirror, has the advantage of compact structure. Replacing the original Martinez stretcher with the concentric stretcher, under the condition of 1 kHz repetition rate and 11.4 W pump power, the stretched chirped pulse is amplified by the ring-cavity Ti: Sapphire regenerative amplifier and then compressed by the grating pair compressor. The compression result with pulse duration of 47.5 fs is obtained, which is close to the Fourier transform limit of spectral bandwidth of 22.1 nm. The results show that the concentric stretcher based on transmission grating can achieve better compression result for femtosecond pulse.

Key words: laser techniques, femtosecond laser, chirped-pulse amplification, pulse stretcher, regenerative amplifier

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