Effect of Intensity Disturbance on Performance of Dual-Frequency Laser Coherent Detection

Jianying, 任建迎 Ren; Huayan, 孙华燕 Sun; Yanzhong, 赵延仲 Zhao; Laixian, 张来线 Zhang

doi:10.3788/lop57.031407

Cited by 1 publication

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“…It can be seen that it is hard to obtain accurate linewidth of pulsed laser in frequency domain, then we look for possible solutions in time domain. An improved DSH (IDSH) method in time domain is proposed 11 for the coherence measurement of CW (CW) based on inter-pulse interference. By chopping CW into pulses and controlling the delay time precisely to align the two pulse trains, the observed coherent phenomena can help to calculate the laser coherence length.…”

Section: Introductionmentioning

confidence: 99%

Coherence analysis of laser pulses based on an external cavity circulation

Xu¹,

Sun²,

Li³

2023

First International Conference on Spatial Atmospheric Marine Environmental Optics (SAME 2023)

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By constructing an external circulating cavity to provide sufficient delay that equals a multiple of pulse repetition time, a method with a fixed experimental configuration is proposed to measure the coherence length of both single-frequency and microwave-modulated optical pulses. This method can accurately determine the number of coherent pulses as well as distinguish the coherence states: complete coherence, partial coherence and complete incoherence. In addition, all desired coherence phenomena are obtained by one-time measurement, avoiding other operations like frequent fiber-cutting or devices-reconnection in previous methods. Simulation results show that the coherence length of the dual-frequency laser is periodically extended by the reciprocal of the frequency difference, and the random jitter of pulse propagation time would result in obvious measurement errors via perturbing coherence status.

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Section: Introductionmentioning

confidence: 99%