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研究了两台独立运转的掺镱光纤飞秒激光器的脉冲序列与载波包络相位同步。使用平衡光学互相关的方法探测两台激光器的脉冲延迟,控制腔内高速压电陶瓷以锁定两台激光器的重复频率,得到两台激光器的剩余相对时间抖动为380as。不同的重复频率锁定带宽会对载波包络相位信号产生明显的影响,相比于使用压电陶瓷(低锁定带宽),使用电光调制器锁定重复频率(高锁定带宽)会使载波包络相位产生额外的噪声。将两台激光器的输出脉冲在空间上重合,入射进入平衡探测器,探测到两台激光器的相对载波包络频率信号。使用腔外声光调制器对两台激光器的载波包络相位进行锁定,得到两台激光器的剩余相位噪声为495mrad。锁定后观测到两激光器的光谱干涉,为相干脉冲合成奠定基础。
The pulse sequences of two ytterbium-doped fiber femtosecond laser systems operating independently and carrier envelope phase synchronization are studied. Using balanced optical cross-correlation method to detect the pulse delay of the two lasers, the high-speed piezoelectric ceramic in the cavity is controlled to lock the repetition frequency of the two lasers, and the remaining relative time jitter of the two lasers is 380as. Different repetition rate lock bandwidths have a significant impact on the carrier envelope phase signal. Using the electro-optic modulator to lock the repetition frequency (high lock bandwidth) results in the phase of the carrier envelope compared to using piezoelectric ceramics (low lock bandwidth) Extra noise. The output pulses of two lasers spatially coincide and enter into the balance detector to detect the relative carrier envelope frequency signals of the two lasers. Using the extraluminal acousto-optic modulator to lock the carrier envelope phase of the two lasers, the remaining phase noise of the two lasers is 495 mrad. After locking, we observed the spectral interference between the two lasers, which laid the foundation for coherent pulse synthesis.