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

Bo Gu; Yubin Chen; Zefeng Wang

doi:10.1117/1.OE.55.12.126114

29 December 2016 Characteristics of 1.9-μm laser emission from hydrogen-filled hollow-core fiber by vibrational stimulated Raman scattering

Bo Gu, Yubin Chen, Zefeng Wang

Author Affiliations +

Optical Engineering, Vol. 55, Issue 12, 126114 (December 2016). https://doi.org/10.1117/1.OE.55.12.126114

Abstract

We report here the characteristics of 1.9-μm 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.

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Bo Gu, Yubin Chen, and Zefeng Wang "Characteristics of 1.9-μm laser emission from hydrogen-filled hollow-core fiber by vibrational stimulated Raman scattering," Optical Engineering 55(12), 126114 (29 December 2016). https://doi.org/10.1117/1.OE.55.12.126114

Received: 2 September 2016; Accepted: 7 December 2016; Published: 29 December 2016

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