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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。
Based on the principle of coherent beam synthesis, a new method of pulsed laser generation is proposed, and a corresponding all-fiber experimental system is designed and constructed. The method effectively controls the phase difference between two coherent beams of coherent light in a fiber coupler to achieve a pulsed laser output with adjustable repetition frequency, pulse width and duty cycle. In the experiment, the closed-loop operating point control method is used to compensate the noise phase to obtain a stable pulse light output. The phase modulation of rectangular wave, triangular wave and sine wave were carried out respectively, and the laser output of the corresponding waveform was obtained. Phase modulation with different parameters of rectangular wave can be obtained from 1 ~ 500 kHz repetition rate, duty cycle from 20% ~ 80% Adjustable pulsed light output with pulse width up to 300 ns at 500 kHz repetition rate. This pulsed laser generation technology provides a new way to generate high power, tunable pulsed laser light.