Author(s): Wang, HY (Wang, Hongyang); Zhang, ZY (Zhang, Zhiyan); Yu, HJ (Yu, Haijun); Zhao, SS (Zhao, Shusen); Dong, ZY (Dong, Zhiyong); Cao, KX (Cao, Kaixuan); Liu, Z (Liu, Zhe); Lin, XC (Lin, Xuechun)

Source: OPTICS AND LASER TECHNOLOGY Volume: 152 Article Number: 108130 DOI: 10.1016/j.optlastec.2022.108130 Published: AUG 2022

Abstract: We propose a gain control method for acousto-optic Q-switched lasers. The laser in single-pulse mode can be converted into a double-pulse mode with adjustable subpulse intervals and energy ratios. It reduces the peak energy density while keeping the total energy unchanged in a cycle and thus effectively avoids damage to the optical fiber. The gain of the beam can be controlled by modulating the diffraction loss in the resonant cavity. A theoretical model of acousto-optic Q-switched double-pulse laser is established. Double-pulsing with adjustable subpulse intervals and energy ratios can be designed. A double-pulse laser is built experimentally, and the actual output waveform is basically consistent with the calculated results of the theoretical model. A double-pulse laser with adjustable energy ratios, adjustable subpulse intervals of 500 ns-20 mu s, and 127 W at 5 kHz can be obtained. In addition, laser paint removal experiments are conducted, proving that the double-pulse laser has the same cleaning ability as the single-pulse laser at the same average output power. At the same time, the damage to the optical fiber can be largely avoided.

Accession Number: WOS:000806397700005

ISSN: 0030-3992

eISSN: 1879-2545

Full Text: https://www.sciencedirect.com/science/article/pii/S0030399222002870?via%3Dihub