Zhang Zhiyan, Wang Hongyang, Wu Zhuo, Yan Fanjiang, Zhao Shusen, Zhiyong Liang, Lin Xuechun
Opt Express. 2025 Feb 24;33(4):8356-8367. doi: 10.1364/OE.554645.
A laser with an adjustable pulse width is very important for laser processing and scientific research. In this study, we propose a theoretical model to adjust laser pulse width by controlling the diffraction loss of the resonator cavity in an acousto-optic Q-switched solid-state laser system. The varies of the diffraction loss are in accordance with a set function, then modulating the release of the inverted population. Analyzing the impact of the diffraction loss function in the process of inverted particle release, we determined the dividing line of control parameters that distinguish normal modulation and pulse distortion and obtained the optimal adjustment parameters. The method and theoretical model were verified by experiment, resulting in a pulse width adjustment range of 27 ns to 62 ns under fixed resonator structure and pumping rate conditions. An adjustable pulse width laser system utilizing the method has a simple laser resonant cavity, and the output pulse width can be adjusted in real-time.
具有可调脉冲宽度的激光器对于激光加工和科学研究非常重要。在本研究中，我们提出了一种理论模型，通过控制声光调Q固态激光系统中谐振腔的衍射损耗来调节激光脉冲宽度。衍射损耗的变化符合设定函数，进而调制粒子数反转分布的释放。通过分析衍射损耗函数在粒子数反转分布释放过程中的影响，我们确定了区分正常调制和脉冲失真的控制参数分界线，并获得了最佳调节参数。该方法和理论模型通过实验得到验证，在固定谐振腔结构和泵浦速率条件下，脉冲宽度调节范围为27纳秒至62纳秒。利用该方法的可调脉冲宽度激光系统具有简单的激光谐振腔，并且输出脉冲宽度可以实时调节。
