Zhang Yunwei, Wang Shang, Fan Yuyuan, Liu Junliang, Qin Zengguang, Zhao Zhigang, Liu Zhaojun
Opt Lett. 2024 Sep 1;49(17):4895-4898. doi: 10.1364/OL.529854.
A method for maintaining a fixed phase relationship between the driving signal of acousto-optic modulator (AOM) and the original mode-locked seed laser is proposed and realized, which stabilizes the amplitude of diffracted signal output from the AOM for subsequent amplification. A field-programmable gate array (FPGA), combined with external summing amplifiers, is used to directly synthesize high-timing-precision driving signals that are synchronized with the seed laser pulses, and the accuracy of signal timing control reaches 160 ps. Using this driver, the standard deviation of the diffracted signal output from the AOM is significantly decreased from 0.52% to 0.18%. This pulse-picking solution also includes a control system that can flexibly control the frequency, gating width, etc., of the driving signal, which makes it more convenient for subsequent laser amplification and makes it suitable for a variety of mode-locked lasers.
提出并实现了一种用于保持声光调制器（AOM）驱动信号与原始锁模种子激光器之间固定相位关系的方法，该方法稳定了从AOM输出的衍射信号的幅度以便后续放大。现场可编程门阵列（FPGA）与外部求和放大器相结合，用于直接合成与种子激光脉冲同步的高定时精度驱动信号，信号定时控制精度达到160 ps。使用该驱动器，AOM输出的衍射信号的标准偏差从0.52%显著降低到0.18%。这种脉冲拾取解决方案还包括一个控制系统，该系统可以灵活地控制驱动信号的频率、选通宽度等，这使得后续激光放大更加方便，并使其适用于各种锁模激光器。
