Liu Jia, Feng Yahui, Li Hao, Lu Peifen, Pan Haifeng, Wu Jian, Zeng Heping
State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, China.
Opt Express. 2011 Jan 3;19(1):40-6. doi: 10.1364/OE.19.000040.
We demonstrate that complex supercontinuum and few-cycle ultrashort laser pulses can be fully characterized by using a cross-correlation frequency-resolved optical gating with molecular alignment induced birefringence functioned as a gate. The temporal envelope and phase of the broadband supercontinuum pulse are retrieved by the principal component generalized projection algorithm. This technique shows advantages without phase-matching constraint that may limit the measurable spectral bandwidth, experimental robustness in operating through the whole transparent spectral region of the molecular gases, and intensity sensitivity to measure weak pulses which is inherited from the intrinsic linear process in recording the molecular birefringence induced polarization spectroscopy. Experimental measurements of a few-cycle pulse in the visible region of 525-725 nm confirm that the molecular alignment gating supports a full field characterization of the ultrashort pulse around 10 fs in duration.
我们证明，通过使用具有分子取向诱导双折射作为门控功能的互相关频率分辨光学门控技术，可以对复杂的超连续谱和少周期超短激光脉冲进行全面表征。利用主成分广义投影算法恢复宽带超连续谱脉冲的时间包络和相位。该技术具有诸多优势，不受可能限制可测量光谱带宽的相位匹配约束，在通过分子气体的整个透明光谱区域操作时具有实验稳健性，并且对测量弱脉冲具有强度敏感性，这是从记录分子双折射诱导偏振光谱的固有线性过程继承而来的。在525 - 725 nm可见光区域对少周期脉冲的实验测量证实，分子取向门控技术能够对持续时间约为10 fs的超短脉冲进行全场表征。
