Kida Yuichiro, Nakano Yuta, Motoyoshi Kazuya, Imasaka Totaro
Opt Lett. 2014 May 15;39(10):3006-9. doi: 10.1364/OL.39.003006.
A frequency-resolved optical gating (FROG) technique that combines autocorrelation (second-harmonic-generation FROG, SHG-FROG) and cross correlation FROG (XFROG) is reported for simultaneous characterization of two unknown optical pulses. Two SHG-FROG signals and a XFROG signal are acquired in a single measurement using a single diagnostic system. Unlike the conventional combination of SHG-FROG for reference-pulse characterization and XFROG for test-pulse characterization, the ambiguity in the direction of time in SHG-FROG is removed during phase retrieval by simultaneously analyzing the three FROG signals. Furthermore, overall characterization is faster, more robust, and highly convergent than the conventional combination of SHG-FROG and XFROG techniques.
报道了一种频率分辨光学门控（FROG）技术，该技术结合了自相关（二次谐波产生FROG，SHG-FROG）和互相关FROG（XFROG），用于同时表征两个未知光脉冲。使用单个诊断系统在单次测量中获取两个SHG-FROG信号和一个XFROG信号。与用于参考脉冲表征的SHG-FROG和用于测试脉冲表征的XFROG的传统组合不同，通过同时分析三个FROG信号，在相位恢复过程中消除了SHG-FROG中时间方向上的模糊性。此外，与SHG-FROG和XFROG技术的传统组合相比，整体表征更快、更稳健且高度收敛。
