Chinese Optics Letters, Vol. 18, Issue 5, 051402 (2020)
Investigation of multispectral SF6 stimulated Raman scattering laser
Chencheng Shen1,2, Xianglong Cai1,3, Youbao Sang1,2, Tiancheng Zheng1,2, Zhonghui Li1, Dong Liu1, Wanfa Liu1, and Jingwei Guo1,*
- 1Key Laboratory of Chemical Lasers, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- 2University of Chinese Academy of Sciences, Beijing 100049, China
- 3School of Science, Changchun University of Science and Technology, Changchun 130022, China
In this work, SF6 as a Raman-active medium is investigated to generate a multispectral Raman laser by the combination of cascade stimulated Raman scattering (SRS) and four wave mixing. The Raman frequency comb from the 10th-order anti-Stokes to the 9th-order Stokes was generated, and its spectral range covered 377–846 nm. The photon conversion efficiency of 16.4% for the first Stokes was achieved, and the Raman gain coefficient at 1.5 MPa of SF6 under the 532 nm pump laser was calculated to be 0.83 cm/GW by the SRS threshold comparison with H2. Using helium as the carrier gas, the thermal effect of the SF6 Raman laser was improved dramatically under a repetition rate of 10 Hz.
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