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Chinese Optics Letters, Volume. 17, Issue 2, 020013(2019)

WSe2 as a saturable absorber for multi-gigahertz Q-switched mode-locked waveguide lasers [Invited]

Ziqi Li1, Rang Li1, Chi Pang1, Yuxia Zhang2, Haohai Yu2, and Feng Chen1、*
Author Affiliations
  • 1School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
  • 2State Key Laboratory of Crystal Materials and Institute of Crystal Materials, Shandong University, Jinan 250100, China
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    a, The AFM image of the WSe2 sample. b, The height profile image. c, The Raman spectrum under the excitation of 532 nm, and the inset is the optical image of the WSe2 sample. d, The linear absorption spectra of WSe2 and the substrate.

    Fig. 1. a, The AFM image of the WSe2 sample. b, The height profile image. c, The Raman spectrum under the excitation of 532 nm, and the inset is the optical image of the WSe2 sample. d, The linear absorption spectra of WSe2 and the substrate.

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    High-resolution X-ray photoelectron spectroscopy (HR-XPS) of CVD-grown WSe2 sample. a, The HR-XPS spectrum of W 4f. b, The HR-XPS spectrum of Se 3d.

    Fig. 2. High-resolution X-ray photoelectron spectroscopy (HR-XPS) of CVD-grown WSe2 sample. a, The HR-XPS spectrum of W 4f. b, The HR-XPS spectrum of Se 3d.

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    Schematic diagram of the experimental setup of Q-switched mode-locked waveguide laser modulated by the WSe2 SA.

    Fig. 3. Schematic diagram of the experimental setup of Q-switched mode-locked waveguide laser modulated by the WSe2 SA.

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    Average output power as a function of the input power. The inset shows the emission spectrum of the waveguide laser modulated by WSe2.

    Fig. 4. Average output power as a function of the input power. The inset shows the emission spectrum of the waveguide laser modulated by WSe2.

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    a, The Q-switched envelope containing mode-locked pulses on 40 ns timescale. b, The Q-switched envelopes on a larger time scale of 1 μs. c, The recorded mode-locked pulse trains on the picosecond timescale.

    Fig. 5. a, The Q-switched envelope containing mode-locked pulses on 40 ns timescale. b, The Q-switched envelopes on a larger time scale of 1 μs. c, The recorded mode-locked pulse trains on the picosecond timescale.

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    a, Recorded single mode-locked pulse train. b, The measured RF spectrum.

    Fig. 6. a, Recorded single mode-locked pulse train. b, The measured RF spectrum.

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    • Table 1. Comparison of GHz Q-Switched Mode-locked Waveguide Lasers Based on 2D Materials

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      Table 1. Comparison of GHz Q-Switched Mode-locked Waveguide Lasers Based on 2D Materials

       Parameters
      2D MaterialsFabrication MethodGain MediaWavelength (nm)Pulse Width (ps)Frequency (GHz)SNR (dB)Ref.
      GrapheneLPETm:YAG1943.5∼707.8–[32]
      GrapheneCVDHo:YAG2091∼1005.9–[34]
      GrapheneLPEYb:BG10391.061.5∼50[33]
      GrapheneCVDYb:Er-doped glass1535∼706.8∼30[40]
      GrapheneCVDNd:YVO41064526.555[35]
      MoS2CVDNd:YVO41064436.551[35]
      Bi2Se3CVDNd:YVO41064266.559[35]
      WSe2CVDNd:YVO41064476.52654This work
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    Ziqi Li, Rang Li, Chi Pang, Yuxia Zhang, Haohai Yu, Feng Chen, "WSe2 as a saturable absorber for multi-gigahertz Q-switched mode-locked waveguide lasers [Invited]," Chin.Opt.Lett. 17, 020013 (2019)

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    Paper Information

    Special Issue: EXTRAORDINARY 2D MATERIALS BASED NANOPHOTONICS

    Received: Oct. 27, 2018

    Accepted: Dec. 7, 2018

    Published Online: Feb. 14, 2019

    The Author Email: Feng Chen (drfchen@sdu.edu.cn)

    DOI:10.3788/COL201917.020013

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology