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

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

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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    Figures & Tables(7)
    Measured attenuation of AR-HCF by a cut-back from 96.8 m to 22 m. Inset: SEM picture of AR-HCF. The core diameter is about 35 µm.
    Schematic of the laser delivery setup. HWP is half wave plate; ISO is isolator; QWP is quarter wave plate; L1, L2, L3, L4 are coated aspherical lenses with f1 = 50 mm, f2 = 150 mm, f3 = 90 mm, f4 = 50 mm; M1 is a sampler to monitor the power of the laser source and backward Stokes light; M2 is another sampler used to monitor the output power and beam profile or wavelength at the same time; PM1, PM2 are power meters. At BM1 and BM2 positions, pump and Stokes laser beams were characterized by using a power meter, optical spectral analyzer, and pyroelectric array camera, respectively.
    Measured output spectra in the forward direction under 5 bar gas pressure for different pump power. Pumped at 1064 nm, the first rotational Stokes laser (RS1) of H2 is at 1135 nm, and the second rotational Stokes (RS2) at 1216 nm.
    Far-field patterns at (a) 1064 nm and (b) 1135 nm measured at the output end of AR-HCF at 5 bar gas pressure.
    Measured powers of the residual pump and forward and backward Rot-SRS as a function of coupled pump power with a H2 pressure at (a) 2.5 bar, (b) 5 bar, (c) 7.5 bar, and (d) 10 bar. In Region (I), Rot-SRS in the forward and backward directions is measured only; (II) bi-directional first Rot-SRS and forward second Rot-SRS, (III) the pump laser failed to work because strong backward Rot-SRS is disturbed. The forward Rot-SRS power (black line) and residual power (red line) refer to the left axis, and the backward Rot-SRS power (blue line) refers to the right axis.
    Power (left axis) and quantum conversion efficiency (right axis) of (a) forward Rot-SRS and (b) backward Rot-SRS as a function of coupled pump power at different gas pressures.
    • Table 1. Comparison of Pump Thresholds in H2-Filled FGRLs under Continuous and Pulsed Operation

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      Table 1. Comparison of Pump Thresholds in H2-Filled FGRLs under Continuous and Pulsed Operation

       Pump Source TypeFiber Core Diameter (µm)Loss (dB/m)Gas Pressure (bar)Threshold Power (W)Normalized Pump Threshold (W·MHz−1·µm−2)
      This paperCW300.11 dB/m at 1064 nm; 0.13 dB/m at 1135 nm1031.55.93
      F. Couny et al. in 2007[17]CW50.1 dB/m at 1064 nm; 0.14 dB/m at 1135 nm52.251.125
      F. Couny et al. in 2010[18]CW60.1 dB/m at 1061 nm; 0.14 dB/m at 1131 nm153713.09
      W. Huang et al. in 2020[13]Pulse (10 ns)90.016 dB/m at 1550 nm; 0.03 dB/m at 1700 nm1640 (peak power)24.8
      H. Li et al. in 2020[29]Pulse (12 ns)90.04 dB/m at 1540 nm; 0.11 dB/m at 1700 nm1650 (peak power)25.18
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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

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    Paper Information

    Category: Lasers, Optical Amplifiers, and Laser Optics

    Received: Mar. 5, 2022

    Accepted: Apr. 18, 2022

    Published Online: May. 7, 2022

    The Author Email: Fei Yu (yufei@siom.ac.cn)

    DOI:10.3788/COL202220.071401

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