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Chinese Optics Letters, Volume. 16, Issue 3, 031402(2018)

Double Q-switched 946 nm laser with MgO:LN electro-optic crystal and MoSe2 saturable absorber

Bing Bai1,2, Yang Bai1,2、*, Diao Li1,2, Yanxiao Sun1,2, Jianlin Li1,2, and Jintao Bai1,2
Author Affiliations
  • 1Institute of Photonics and Photon-Technology, National Key Laboratory of Photoelectric Technology and Functional Materials (Culture Base), Northwest University, Xi’an 710069, China
  • 2Shaanxi Engineering Technology Research Center for Solid State Lasers and Application, Xi’an 710069, China
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    (a) Raman spectrum of MoSe2 film. Inset: microscopic morphology of MoSe2 film, scale bar: 40 μm. (b) Morphology (inset) and thickness profile (the white line in the inset) of the MoSe2 film measured by AFM.

    Fig. 1. (a) Raman spectrum of MoSe2 film. Inset: microscopic morphology of MoSe2 film, scale bar: 40 μm. (b) Morphology (inset) and thickness profile (the white line in the inset) of the MoSe2 film measured by AFM.

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    (a) Linear absorption spectrum of monolayer MoSe2 film. (b) Normalized nonlinear optical transmittance (blue dots) measured with Z-scan apparatus by using ultrashort pulsed laser (1030 nm, 340 fs) and theoretical fitting (red line) of the monolayer MoSe2.

    Fig. 2. (a) Linear absorption spectrum of monolayer MoSe2 film. (b) Normalized nonlinear optical transmittance (blue dots) measured with Z-scan apparatus by using ultrashort pulsed laser (1030 nm, 340 fs) and theoretical fitting (red line) of the monolayer MoSe2.

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    Sketch of the experimental setup (top view). Inset: monolayer MoSe2 SA mirror.

    Fig. 3. Sketch of the experimental setup (top view). Inset: monolayer MoSe2 SA mirror.

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    Pulse peak power versus incident pump energy of LD. Inset: sub-pulses in a pulse train for MoSe2 passively Q-switching operation.

    Fig. 4. Pulse peak power versus incident pump energy of LD. Inset: sub-pulses in a pulse train for MoSe2 passively Q-switching operation.

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    Output performances of 946 nm pulse laser for actively EO, MoSe2 passively, and double Q-switching operation. (a) Single pulse energy, (b) pulse width, (c) peak power, and (d) symmetrical factor.

    Fig. 5. Output performances of 946 nm pulse laser for actively EO, MoSe2 passively, and double Q-switching operation. (a) Single pulse energy, (b) pulse width, (c) peak power, and (d) symmetrical factor.

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    Output pulse profiles of (a) actively EO, (b) MoSe2 passively, and (c) double Q-switching operation.

    Fig. 6. Output pulse profiles of (a) actively EO, (b) MoSe2 passively, and (c) double Q-switching operation.

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    Linewidth of 946 nm pulse laser with actively EO, MoSe2 passively, and double Q-switching operation.

    Fig. 7. Linewidth of 946 nm pulse laser with actively EO, MoSe2 passively, and double Q-switching operation.

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    2D and 3D near-field beam profiles of (a) actively EO, (b) MoSe2 passively, and (c) double Q-switching operation.

    Fig. 8. 2D and 3D near-field beam profiles of (a) actively EO, (b) MoSe2 passively, and (c) double Q-switching operation.

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    • Table 1. Actively EO, Passively MoSe2 and Double Q-switched Laser Performances

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      Table 1. Actively EO, Passively MoSe2 and Double Q-switched Laser Performances

          Peak-to-peak Instability  
      Q-switching ModeMaximum Single Pulse Energy (mJ)Pulse Width (ns)Peak Power (kW)DurationEnergySpectral Linewidth (nm)Symmetrical Factor
      EO-actively5.4820.2271±4.66%±5.78%0.2450.38
      MoSe2-passively0.10651.52.06±6.18%±8.14%0.1970.92
      Double3.159.1346±2.87%±3.42%0.1730.87
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    Bing Bai, Yang Bai, Diao Li, Yanxiao Sun, Jianlin Li, Jintao Bai. Double Q-switched 946 nm laser with MgO:LN electro-optic crystal and MoSe2 saturable absorber[J]. Chinese Optics Letters, 2018, 16(3): 031402

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    Paper Information

    Category: Lasers and Laser Optics

    Received: Dec. 7, 2017

    Accepted: Jan. 12, 2018

    Published Online: Jul. 13, 2018

    The Author Email: Yang Bai (bys627@126.com)

    DOI:10.3788/COL201816.031402

    Topics

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