Characteristics of 1.9-μm laser emission from hydrogen-filled hollow-core fiber by vibrational stimulated Raman scattering

被引：9
作者：
Gu, Bo [1 ]
Chen, Yubin [1 ]
Wang, Zefeng [1 ]
机构：
[1] Natl Univ Def Technol, Coll Optoelect Sci & Engn, 109 Deya Rd, Changsha 410073, Hunan, Peoples R China
来源：
OPTICAL ENGINEERING | 2016年 / 55卷 / 12期
基金：
中国国家自然科学基金;
关键词：
fiber lasers; molecular gas lasers; hollow-core fiber; stimulated Raman scattering; PHOTONIC CRYSTAL FIBER; H-2; GENERATION; DEPENDENCE; GAIN; H2;
D O I：
10.1117/1.OE.55.12.126114
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We report here the characteristics of 1.9-mu m laser emission from a gas-filled hollow-core fiber by stimulated Raman scattering (SRS). A 6.5-m hydrogen-filled ice-cream negative curvature hollow-core fiber is pumped with a high peak-power, narrow linewidth, linearly polarized subnanosecond pulsed 1064-nm microchip laser, generating a pulsed vibrational Stokes wave at 1908.5 nm. The maximum quantum efficiency of about 48% is obtained, which is mainly limited by the mode mismatch between the pump laser beam and the Stokes wave in the hollow-core fiber. The linewidths of the pump laser and the first-order vibrational Stokes wave are measured to be about 1 and 2 GHz, respectively, by a scanning Fabry-Perot interferometer. The pressure selection phenomenon of the vibrational anti-Stokes waves is also investigated. The pulse duration of the vibrational Stokes wave is recorded to be narrower than that of the pump laser. The polarization properties of the hollow-core fiber and the polarization dependence of the vibrational and the rotational SRS are also studied. The beam profile of the vibrational Stokes wave shows good quality. (C) 2016 Society of Photo-Optical Instrumentation Engineers (SPIE).
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页数：8
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