采用外场目标对腔内调频连续波进行时间延迟,并用相干探测方式获取信号。分析表明动态谐振腔连续波CO2激光器支线起振的典型时间为20μs,支线竞争结束并不意味着起振的支线相干性同时达到最佳状态。实验观察到相干性建立所需的最短时间比支线起振延迟6μs,且大多数支线相干性的建立需要更长时间

The reconstructingprocess of the branch lines of a continuous wave CO2 laser is observedexperimentally with the help of a FMCW laser radar system. It is considered that thebranch line is stabilized when the heterodyne signal of a far-field target appears. It isconcluded that different branch line takes different time to reach its stability, and thetypical time is about 20 μs. Especially, the end of the competition between branch linesdoesn′t mean thecoherence reaching its best situation. The observation shows that it takes at least 6 μs to reconstruct the coherence ofa branch line.