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Research on heterodyne detection of a mode-locked pulse laser based on an acousto-optic frequency shift

机译：基于声光频移的锁模脉冲激光外差检测研究

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Heterodyne detection research is carried out on a mode-locked pulse laser using an acousto-optic frequency shifter (AOFS). Theoretical calculation and numerical simulation of the beat frequency of the mode-locked pulse were carried out, and the results show that the frequency offset can be calculated according to the beat period of the pulse waveform, and the offset is the frequency difference between the two adjacent longitudinal modes. Experiments were implemented with a self-built mode-locked laser using an AOFS to simulate the frequency shift of the detection laser induced by the object, the coherent beat frequency of the signal light and local oscillation light that were observed on the surface of the detector. The beat frequency wave was processed by filtering to obtain the frequency shift of the signal light. The experimental results are in good agreement with the numerical simulation.
机译：使用声光移频器（AOFS）对锁模脉冲激光器进行外差检测研究。对锁模脉冲的拍频进行了理论计算和数值模拟，结果表明可以根据脉搏波形的拍周期计算出频率偏移，偏移是两者之间的频率差相邻的纵向模式。实验是通过使用AOFS的自锁模锁激光器进行的，以模拟由物体引起的检测激光的频移，在检测器表面观察到的信号光和本地振荡光的相干拍频。通过过滤对拍频波进行处理以获得信号光的频移。实验结果与数值模拟吻合良好。

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