中国激光, 2016, 43 (8): 0801003, 网络出版: 2016-08-10
两台独立飞秒激光器的脉冲序列与载波包络相位同步 下载: 567次
Timing and Carrier Envelope Phase Synchronization from Two Independent Femtosecond Lasers
激光器 光纤飞秒激光器 平衡光学互相关 载波包络相位 声光调制器 锁相环 lasers fiber femtosecond laser balanced optical correlation carrier envelope phase acousto-optic modulator phase locking loop
摘要
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380 as。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495 mrad。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。
Abstract
We studied the timing and carrier envelope phase synchronization from two independent Yb-doped femtosecond lasers. With the balanced optical correlation method used, timing delay of the pulses from two lasers is detected. Two pulse trains are synchronized through controlling the piezoelectric transducer in one of the laser cavities and the residual timing jitter is 380 as. Different repetition rate locking bandwidths yield different carrier envelope phase signal characteristics. Compared with using the piezoelectric transducer (narrow locking bandwidth), using the electro-optic modulator (wide locking bandwidth) leads excess noise to the carrier envelope phase during the repetition rate locking. The output of the two lasers is coincident in space, enters the balanced detector, and the relative carrier envelope frequency signal is detected. The carrier envelope phase is tightly locked by using an external cavity acousto-optic modulator, and the residual phase noise is 495 mrad. The spectrum coherence of the two lasers is achieved, which is the basis of coherent pulse synthesis.
田昊晨, 宋有建, 马春阳, 胡明列, 王清月. 两台独立飞秒激光器的脉冲序列与载波包络相位同步[J]. 中国激光, 2016, 43(8): 0801003. Tian Haochen, Song Youjian, Ma Chunyang, Hu Minglie, Wang Qingyue. Timing and Carrier Envelope Phase Synchronization from Two Independent Femtosecond Lasers[J]. Chinese Journal of Lasers, 2016, 43(8): 0801003.