Vertically standing PtSe2 film: a saturable absorber for a passively mode-locked Nd:LuVO4 laser
The novel vertically standing PtSe2 film on transparent quartz was prepared by selenization of platinum film deposited by the magnetron sputtering method, and an Nd:LuVO4 passively mode-locked solid-state laser was realized by using the fabricated PtSe2 film as a saturable absorber. The X-ray diffraction pattern and Raman spectrum of the film indicate its good crystallinity with a layered structure. The thickness of PtSe2 film is measured to be 24 nm according to the cross-section height profile of the atomic force microscope image. High-resolution transmission electron microscopy images clearly demonstrate its vertically standing structure with an interlayer distance of 0.54 nm along the c-axis direction. The modulation depth (ΔT) and saturation fluence (?s) of PtSe2 film are measured to be 12.6% and 17.1 μJ/cm2, respectively. The obtained mode-locked laser spectrum has a central wavelength of 1066.573 nm, with a 3 dB bandwidth of 0.106 nm. The transform limited pulse width of the mode-locked laser was calculated to be 15.8 ps. A maximum average output power of 180 mW with a working repetition rate of 61.3 MHz is obtained. To the best of our knowledge, this is the first report of the generation of ultrafast mode-locked laser pulses by using layered PtSe2 as a saturable absorber.
基金项目：National Natural Science Foundation of China (NSFC)10.13039/501100001809 (61705044); One-Hundred Young Talents Program of Guangdong University of Technology (GDUT)10.13039/501100008326 (220413145); Research Grants Council, University Grants Committee (RGC, UGC)10.13039/501100002920 (GRF 152109/16E PolyU B-Q52T); Hong Kong Polytechnic University (PolyU)10.13039/501100004377 (G-YBVG).
Xiaowen Huang：Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
Junshan He：School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China
Yajun Lou：School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China
Longhui Zeng：Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
Yonghui Li：School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China
Hui Long：Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
Jingbo Li：School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China
Ling Zhang：Laboratory of All-Solid-State Light Sources, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, Chinae-mail: email@example.com
Yuen Hong Tsang：Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, Chinae-mail: firstname.lastname@example.org
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Lili Tao, Xiaowen Huang, Junshan He, Yajun Lou, Longhui Zeng, Yonghui Li, Hui Long, Jingbo Li, Ling Zhang, and Yuen Hong Tsang, "Vertically standing PtSe2 film: a saturable absorber for a passively mode-locked Nd:LuVO4 laser," Photonics Research 6(7), 750-755 (2018)