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Photonics Research, Volume. 7, Issue 11, 1209(2019)

Direct generation of an ultrafast vortex beam in a CVD-graphene-based passively mode-locked Pr:LiYF4 visible laser

Nan Li1, Junjie Huang3, Bin Xu1,2、*, Yaqi Cai1, Jie Lu3, Linjie Zhan3, Zhengqian Luo1, Huiying Xu1, Zhiping Cai1, and Weiwei Cai3
Author Affiliations
  • 1Department of Electronic Engineering, Xiamen University, Xiamen 361005, China
  • 2Shenzhen Research Institute of Xiamen University, Shenzhen 518057, China
  • 3Department of Physics, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, China
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    Schematic of the graphene mode-locked Pr:YLF laser with total cavity length of about 106 cm (M1-M2: 13 cm, M2-M4: 27 cm, M1-M3: 59 cm, and M3-M5: 7 cm).

    Fig. 1. Schematic of the graphene mode-locked Pr:YLF laser with total cavity length of about 106 cm (M1-M2: 13 cm, M2-M4: 27 cm, M1-M3: 59 cm, and M3-M5: 7 cm).

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    Raman spectrum of the graphene excited by a 488 nm laser. Inset: SEM (left) and AFM (right) images of the CVD graphene.

    Fig. 2. Raman spectrum of the graphene excited by a 488 nm laser. Inset: SEM (left) and AFM (right) images of the CVD graphene.

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    Average output power versus absorbed power of mode-locked Pr:YLF laser at 721 nm.

    Fig. 3. Average output power versus absorbed power of mode-locked Pr:YLF laser at 721 nm.

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    (a) Spectra of CW and mode-locked lasers. (b) RF spectrum. (c) Typical mode-locked pulse trains. (d) Single pulse trace.

    Fig. 4. (a) Spectra of CW and mode-locked lasers. (b) RF spectrum. (c) Typical mode-locked pulse trains. (d) Single pulse trace.

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    Average output power versus absorbed power of the ML vortex laser. Inset: (left) vortex beam spot with intensity distribution curve, (middle) anticlockwise interference pattern, and (right) clockwise interference pattern.

    Fig. 5. Average output power versus absorbed power of the ML vortex laser. Inset: (left) vortex beam spot with intensity distribution curve, (middle) anticlockwise interference pattern, and (right) clockwise interference pattern.

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    (a) Optical spectrum of ML vortex. (b) Radio-frequency spectrum of ML vortex. (c) Single pulse trace of ML vortex. (d) Typical mode-locked pulse train on microsecond time scales.

    Fig. 6. (a) Optical spectrum of ML vortex. (b) Radio-frequency spectrum of ML vortex. (c) Single pulse trace of ML vortex. (d) Typical mode-locked pulse train on microsecond time scales.

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    Nan Li, Junjie Huang, Bin Xu, Yaqi Cai, Jie Lu, Linjie Zhan, Zhengqian Luo, Huiying Xu, Zhiping Cai, Weiwei Cai, "Direct generation of an ultrafast vortex beam in a CVD-graphene-based passively mode-locked Pr:LiYF4 visible laser," Photonics Res. 7, 1209 (2019)

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    Paper Information

    Category: Lasers and Laser Optics

    Received: Aug. 19, 2019

    Accepted: Sep. 2, 2019

    Published Online: Oct. 8, 2019

    The Author Email: Bin Xu (xubin@xmu.edu.cn)

    DOI:10.1364/PRJ.7.001209

    Topics

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