Small signal gain measurement of liquid oxygen under different wavelength laser pump

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

doi:10.1117/12.2065225

3 February 2015 Small signal gain measurement of liquid oxygen under different wavelength laser pump

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

Author Affiliations +

Proceedings Volume 9255, XX International Symposium on High-Power Laser Systems and Applications 2014; 925529 (2015) https://doi.org/10.1117/12.2065225
Event: XX International Symposium on High Power Laser Systems and Applications, 2014, Chengdu, China

Abstract

Oxygen molecules existed in pairs under liquid condition, the radiation from vibrational ground state of ¹ Δ state to the first vibrational excited state of ³ ∑ state was electronic dipole moment transition allowed, and a photon with wavelength of 1580 nm was emitted. In our experiment, dye laser with wavelength of 581 nm, 634 nm, 764 nm was used to excite liquid oxygen to different excited states, while a tunable OPO was used as the seeder laser, and the small signal gain was measured to be 0.23 cm^-1, 0.3 cm^-1 and 0.076 cm^-1 respectively. The small signal gain (pump by photon of 634 nm) was significantly higher than that of common solid state lasers and chemical lasers. When the fundamental output of a Q-switched Nd:YAG laser was used as the pump source, the corresponding small signal gain was 0.12 cm^-1. The profiles of small signal gain form 1579.2 nm to 1580.8 nm were also presented. These results were consistent with theoretical calculation. The high positive gain indicated that the liquid oxygen was a potential medium for high energy laser. A comprehensive parameter optimization was still necessary in order to improve the mall signal gain.

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Zhe Shi, Hui Li, Canhua Zhou, Jinbo Liu, Xianglong Cai, Shu Hu, Baodong Gai, Dongjian Zhou, Dong Liu, Jingwei Guo, and Yuqi Jin "Small signal gain measurement of liquid oxygen under different wavelength laser pump", Proc. SPIE 9255, XX International Symposium on High-Power Laser Systems and Applications 2014, 925529 (3 February 2015); https://doi.org/10.1117/12.2065225

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