Hydrogen Molecules Rotational Stimulated Raman Scattering in All-Fiber Cavity Based on Hollow-Core Photonic Crystal Fibers

Here, we report the rotational stimulated Raman scattering (SRS) of hydrogen molecules in an all-fiber cavity based on hollow-core photonic crystal fibers (HC-PCFs). The gas cavity consists of a 49 m long HC-PCF filled with 18 bar high-pressure hydrogen and two sections of fusion spliced solid-core fibers on both ends. When pumped by a homemade 1064 nm pulsed fiber amplifier, only rotational SRS occurs in the gas cavity due to the transmission spectral characteristics of the used HC-PCF, and 1135 nm Stokes wave is obtained (Raman frequency shift of 587 cm(-1)). By changing the pulse width and repetition frequency of the pump source, the output characteristics are explored. In addition, a theoretical model is established for comparison with the experimental results. This work is helpful for the application of gas Raman laser based on the HC-PCFs.

Automated summary

The rotational stimulated Raman scattering of hydrogen molecules in an all-fiber cavity based on hollow-core photonic crystal fibers was reported. By using a homemade 1064 nm pulsed fiber amplifier, rotational SRS was induced in the gas cavity, leading to the generation of a 1135 nm Stokes wave. The output characteristics were explored by adjusting the pulse width and repetition frequency of the pump source, while a theoretical model was established for comparison with experimental results, facilitating the application of gas Raman laser based on HC-PCFs.