Optimizing laser active Q-switched through a few-layer WS2 passive saturable absorber

Duhang Zheng; Shipeng Liu; Shumeng Wu; Sirui Zhang; Shikun Sun; Zimu Wang

doi:10.1117/12.3036924

11 October 2024 Optimizing laser active Q-switched through a few-layer WS₂ passive saturable absorber

Duhang Zheng, Shipeng Liu, Shumeng Wu, Sirui Zhang, Shikun Sun, Zimu Wang

Proceedings Volume 13287, Nineteenth National Conference on Laser Technology and Optoelectronics; 1328706 (2024) https://doi.org/10.1117/12.3036924
Event: Nineteenth National Conference on Laser Technology and Optoelectronics, 2024, Shanghai, China

Abstract

The main research content of this paper is to achieve active-passive dual-loss Q-switched based on a WS₂ saturable absorber (SA) with a thickness of 1.6 nm，thereby optimizing 1.06 μm laser pulse output characteristics. The few layers of WS₂ nano-film material were prepared by combining electron beam evaporation (EBE) with chemical vapor deposition (CVD). The unsaturated absorption loss of the WS₂ sample is 7.3%, the modulation depth (ΔT) is calculated to be 19.2%, and the saturation power intensity(I_sat) was fitted to be 1.64 MW/cm². The prepared WS₂-SA successfully achieved passive Q-switched of the laser. When the pump power is 3 W, the maximum average output power, pulse width, pulse repetition rate, single pulse energy, and peak power are 752 mW, 390 ns, 400 kHz, 1.88 μJ, and 4.82 W, respectively-utilizing the saturable absorption characteristics of WS₂ to reduce the threshold of the acoustic-optic modulator (AOM) active Q-switched laser. Through comparative experiments, it is shown that the attributes of AOM+WS₂ active-passive Q-switched laser have been optimized. When the AOM frequency is 10 kHz, the narrowest pulse width of the dual-loss Q-switched laser is 16 ns, which is 30.4% less than the single AOM active Q-switched laser. The peak power of the active-passive Q-switched laser is 2.24 kW, which is 29.5% higher than the former. The pulse width compression and peak power increase are significant, which is beneficial for the instantaneous energy output of the laser.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Duhang Zheng, Shipeng Liu, Shumeng Wu, Sirui Zhang, Shikun Sun, and Zimu Wang "Optimizing laser active Q-switched through a few-layer WS₂ passive saturable absorber", Proc. SPIE 13287, Nineteenth National Conference on Laser Technology and Optoelectronics, 1328706 (11 October 2024); https://doi.org/10.1117/12.3036924

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