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• Chinese Optics Letters
• Vol. 20, Issue 7, 071401 (2022)
Xinyue Zhu1、2, Fei Yu2、3、*, Dakun Wu3, Yan Feng2、3, Shufen Chen1, Yi Jiang1, and Lili Hu2、3
Author Affiliations
• 1School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
• 2Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
• 3Hangzhou Institute for Advanced Study, UCAS, Hangzhou 310024, China
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Xinyue Zhu, Fei Yu, Dakun Wu, Yan Feng, Shufen Chen, Yi Jiang, Lili Hu. Low-threshold continuous operation of fiber gas Raman laser based on large-core anti-resonant hollow-core fiber[J]. Chinese Optics Letters, 2022, 20(7): 071401 Copy Citation Text show less

Abstract

Continuous operation of fiber gas Raman lasing at the 1135 nm wavelength is experimentally demonstrated with an output power exceeding 26 W. Rotational stimulated Raman scattering (Rot-SRS) is generated in the hydrogen gas filled 50 m homemade anti-resonant hollow-core fiber (AR-HCF). A single-frequency fiber laser at the 1064 nm wavelength is used as the pump source, and a minimum threshold of 31.5 W is measured where the core diameter of AR-HCF reaches 37 µm. Up to 40.4% power conversion efficiency of forward Rot-SRS is achieved in the single-pass configuration, corresponding to a quantum efficiency of 43.1%. Over 1 W strong backward Rot-SRS is observed in the experiment, ultimately limiting the further increase of Rot-SRS generation in the forward direction.

1. Introduction

Gas-filled microstructured hollow-core fibers (MS-HCFs) have demonstrated many advantages as a minimized gas cell and shown the promising potential of reforming the bulky gas laser[1] and sensors into a more compact and robust all-fiber configuration[2]. The gas–light interaction along MS-HCF could be possibly enhanced by $106$ times stronger than that in the Rayleigh zone of the free-space laser beam[3]. In MS-HCF, both the gas and light field could be tightly confined in a core region of tens of $µm2$ area. Meanwhile, its effective interaction length depending on the fiber loss is much extended to tens of meters. The latest development of anti-resonant hollow-core fiber (AR-HCF) demonstrated 0.22 dB/km minimum fiber loss that implies more than a thousand effective length to use[4].

Copy Citation Text
Xinyue Zhu, Fei Yu, Dakun Wu, Yan Feng, Shufen Chen, Yi Jiang, Lili Hu. Low-threshold continuous operation of fiber gas Raman laser based on large-core anti-resonant hollow-core fiber[J]. Chinese Optics Letters, 2022, 20(7): 071401