Abstract
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.
Highlights
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Hunan Provincial Key Laboratory of High Energy Laser Technology, Changsha 410073, China
We report the hydrogen stimulated Raman scattering (SRS) in an all-fiber cavity based on hollow-core photonic crystal fibers (HC-PCFs)
The line at 1135 nm is the first-order Raman line, and it is converted from 1064 nm pump line by the rotational SRS of hydrogen molecules in the gas converted from 1064 nm pump line by the rotational SRS of hydrogen molecules in the cavity
Summary
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Hunan Provincial Key Laboratory of High Energy Laser Technology, Changsha 410073, China. 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. By changing the pulse width and repetition frequency of the pump source, the output characteristics are explored. This work is helpful for the application of gas Raman laser based on the HC-PCFs. Since the first demonstration in 1963 [1], stimulated Raman scattering (SRS) in gases has been considered as an effective way of generating lasers at unobtainable wavelengths
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