基于光束相干合成的原理, 提出了脉冲激光产生的新方法, 设计并构造了相应的全光纤实验系统。该方法通过对光纤耦合器中相干合成的两束相干光的相位差进行有效地控制, 实现重复频率、脉宽、占空比均可调的脉冲激光输出。实验中利用闭环工作点控制法进行噪声相位补偿, 以得到稳定的脉冲光输出。实验分别利用矩形波、三角波、正弦波进行相位调制, 得到了相应波形的激光输出; 利用不同参量矩形波进行相位调制, 可以得到重复频率从1～500 kHz,占空比从20%～80%可调的脉冲光输出, 在重复频率为500 kHz时, 脉宽可达300 ns。这种脉冲激光产生技术为大功率、可调脉冲激光的产生提供了一种新的途径。

A novel adjustable pulse laser based on phase control of the coherent beam combination is proposed. Corresponding experiment setup with all fiber-based components is designed and manufactured. By controlling the phase difference of the two coherent beams which are coherently combined in a fiber coupler, pulse laser with adjustable repetition rate, pulse duration and duty cycle can be generated. In order to generate stable pulse, the close-loop control method is induced to compensate the phase difference noise. Different wave signals such as rectangular wave, sine wave, triangular wave have been used to modulate the phase difference in experiments, and corresponding pulse lasers are demonstrated. Rectangular wave signal with different parameters is used to modulate the phase difference in experiments, corresponding pulse laser with repetition rate from 1 kHz to 500 kHz and duty cycle from 20% to 80% can be generated. Pulse with 300 ns pulse duration can be demonstrated with repetition rate of 500 kHz. This pulse laser generate technique provides a new approach for the generation of high power, multi-parameter adjustable pulse laser.