Low-threshold continuous operation of fiber gas Raman laser based on large-core anti-resonant hollow-core fiber

Xinyue Zhu; Fei Yu; Dakun Wu; Yan Feng; Shufen Chen; Yi Jiang; Lili Hu

doi:10.3788/COL202220.071401

Journals >Chinese Optics Letters >Volume 20 >Issue 7 >Page 071401 > Article

Chinese Optics Letters
Vol. 20, Issue 7, 071401 (2022)

Low-threshold continuous operation of fiber gas Raman laser based on large-core anti-resonant hollow-core fiber

Xinyue Zhu^1、2, Fei Yu^2、3、*, Dakun Wu³, Yan Feng^2、3, Shufen Chen¹, Yi Jiang¹, and Lili Hu^2、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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DOI: 10.3788/COL202220.071401 Cite this Article

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

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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.

Keywords

anti-resonant hollow-core fiber fiber gas laser rotational stimulated Raman scattering

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 $10^{6}$ 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 ${µm}^{2}$ 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].