基于单片方案和729纳米激光绝对频率测量的350兆赫钛宝石激光频率梳。

A 350 MHz Ti:sapphire laser comb based on monolithic scheme and absolute frequency measurement of 729 nm laser.

作者信息

Zhang Wei, Han Hainian, Zhao Yanying, Du Qiang, Wei Zhiyi

机构信息

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China.

出版信息

Opt Express. 2009 Apr 13;17(8):6059-67. doi: 10.1364/oe.17.006059.

DOI:10.1364/oe.17.006059

PMID:19365428

Abstract

We realized a novel frequency comb based on femtosecond Ti:sapphire laser with 350 MHz repetition rate and monolithic scheme for carrier-envelope-offset frequency generation. Long-term stabilization of more than 9 hours was demonstrated by simultaneously locking repetition rate (f(rep)) and carrier-envelope-offset frequency (f(ceo)) to an atomic clock. The Allan deviations of f(ceo) and f(rep) are 2.3 x 10(-13) and 1.5 x 10(-15) at 100 s averaging time, respectively, and the reproducibility of f(ceo) with high accurate performance is also verified by comparison of the locking results recorded in 3 different days. By avoiding the extra noise induced by photonic crystal fiber, we obtained the accumulated phase error increase from in-loop to out-of-loop as small as 12 mrad [1 Hz, 100 kHz]. Furthermore, the absolute optical frequency of a stabilized 729 nm Ti:sapphire laser which is referenced to a ultra-low expansion (ULE) cavity is measured by the comb and determined to be 411041985391583+/-10 Hz.

摘要

我们实现了一种基于飞秒钛宝石激光器的新型频率梳，其重复频率为350 MHz，并采用单片方案来产生载波包络偏移频率。通过将重复频率（f(rep)）和载波包络偏移频率（f(ceo)）同时锁定到原子钟，实现了超过9小时的长期稳定。在100 s平均时间下，f(ceo)和f(rep)的阿伦偏差分别为2.3×10⁻¹³和1.5×10⁻¹⁵，并且通过比较在3个不同日期记录的锁定结果，验证了f(ceo)具有高精度性能的可重复性。通过避免光子晶体光纤引入的额外噪声，我们获得了从环路内到环路外累积相位误差增加量低至12 mrad [1 Hz，100 kHz]。此外，通过该频率梳测量了以超低膨胀（ULE）腔为参考的稳定729 nm钛宝石激光器的绝对光学频率，确定为411041985391583±10 Hz。