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)
- Photonics Research
- Vol. 7, Issue 11, 1209 (2019)
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).
Fig. 2. Raman spectrum of the graphene excited by a 488 nm laser. Inset: SEM (left) and AFM (right) images of the CVD graphene.
Fig. 3. Average output power versus absorbed power of mode-locked Pr:YLF laser at 721 nm.
Fig. 4. (a) Spectra of CW and mode-locked lasers. (b) RF spectrum. (c) Typical mode-locked pulse trains. (d) Single pulse trace.
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.
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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