Kim Jungwon, Chen Jeff, Cox Jonathan, Kärtner Franz X
Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Opt Lett. 2007 Dec 15;32(24):3519-21. doi: 10.1364/ol.32.003519.
Timing jitter characterization of optical pulse trains from free-running mode-locked lasers with attosecond resolution is demonstrated using balanced optical cross correlation in the timing detector and the timing delay configurations. In the timing detector configuration, the balanced cross correlation between two mode-locked lasers synchronized by a low-bandwidth phase-locked loop is used to measure the timing jitter spectral density outside the locking bandwidth. In addition, the timing delay configuration using a 325 m long timing-stabilized fiber link enables the characterization of timing jitter faster than the delay time. The limitation set by shot noise in this configuration is 2.2 x 10(-8) fs(2)/Hz corresponding to 470 as in 10 MHz bandwidth.
利用定时探测器和定时延迟配置中的平衡光学互相关，展示了以阿秒分辨率对自由运转锁模激光器产生的光脉冲序列进行定时抖动表征。在定时探测器配置中，由低带宽锁相环同步的两个锁模激光器之间的平衡互相关用于测量锁定带宽之外的定时抖动谱密度。此外，使用325米长的定时稳定光纤链路的定时延迟配置能够对比延迟时间更快的定时抖动进行表征。此配置中散粒噪声设定的限制为2.2×10^(-8) fs²/Hz，对应于10兆赫兹带宽中的470阿秒。
