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Stimulated vibrational–rotational Raman scattering of hydrogen pumped at a 1064-nm laser

Xianglong Cai, Ming Xu, Yuxi Jia, Jinbo Liu, Pengyuan Wang, Ying Chen, Baodong Gai, Yong Tan, Hongxing Cai, and Jingwei Guo

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Abstract

A ${\sim}{{2}.{1 {\text-}}}\unicode{x00B5}{\rm m}$ laser is within an atmospheric transmission window and can be used in remote sensing. In this work, a 1064-nm laser was used as the pump source, pressurized hydrogen was used as the Raman active medium, and a dual-wavelength ${\sim}{{2}.\rm{1{\text -}}}\unicode{x00B5}{\rm m}$ Raman laser was generated. The 2147-nm laser was generated by a combination processes of stimulated vibrational Raman scattering and stimulated rotational Raman scattering, while a 2132-nm laser was generated by stimulated S-branch vibrational Raman scattering. Optimizing experimental conditions yielded a maximum pulse energy of 76.1 mJ, a peak power of ${\sim}{9.2}\;{\rm{MW}}$, and a photon conversion efficiency of 29.8%.

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