H2 stimulated Raman scattering in a multi-pass cell

Xianglong Cai; Jingwei Guo; Canhua Zhou; Dongjian Zhou; Jinbo Liu; Zhe Shi; Hui Li; Shu Hu; Baodong Gai; Dong Liu; Yong Tan; Hongxing Cai; Yuqi Jin

doi:10.1117/12.2065351

3 February 2015 H₂ stimulated Raman scattering in a multi-pass cell

Xianglong Cai, Jingwei Guo, Canhua Zhou, Dongjian Zhou, Jinbo Liu, Zhe Shi, Hui Li, Shu Hu, Baodong Gai, Dong Liu, Yong Tan, Hongxing Cai, Yuqi Jin

Author Affiliations +

Proceedings Volume 9255, XX International Symposium on High-Power Laser Systems and Applications 2014; 92552I (2015) https://doi.org/10.1117/12.2065351
Event: XX International Symposium on High Power Laser Systems and Applications, 2014, Chengdu, China

Abstract

Stimulated Raman Scattering (SRS) is an effective means of laser wavelength conversion. Hydrogen is an excellent Raman medium for its high stimulated Raman gain coefficient and good flowability which can rapidly dissipate the heat generated by SRS process. In this paper we reported the H₂ SRS in multiple-pass cell pumped by the fundamental frequency output of a Q-switched Nd: YAG laser. Two concave reflection mirrors (with 1000 mm curvature radius and 50 mm diameter) were used in our experiment, both mirrors with a hole near the edge and were positioned to form co-center cavity, therefore the laser could repeatedly pass and refocus in the Raman cell to achieve a high SRS conversion efficiency and reduce SRS threshold for pump laser. By changing the pass number (1～17) of optical path in the Raman cell and the pump power(0～2.5MW), the Stokes conversion efficiency is optimized. Experimental results indicated that the Raman threshold was 0.178MW and the highest photon conversion efficiency was 50 %.

Citation Download Citation

Xianglong Cai, Jingwei Guo, Canhua Zhou, Dongjian Zhou, Jinbo Liu, Zhe Shi, Hui Li, Shu Hu, Baodong Gai, Dong Liu, Yong Tan, Hongxing Cai, and Yuqi Jin "H₂ stimulated Raman scattering in a multi-pass cell", Proc. SPIE 9255, XX International Symposium on High-Power Laser Systems and Applications 2014, 92552I (3 February 2015); https://doi.org/10.1117/12.2065351

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