Study of coherent transient phenomena coupling entire light wavelength region

利用覆盖从紫外到红外波段的超宽带相干光源的频率相干性，证明了在没有GDD控制的情况下单周期现象的产生和探测。在相干瞬态现象中，两个泵浦脉冲之间的非线性互相关可以用来控制超快瞬态现象。利用频率和条纹分辨的非线性互相关技术，设计了一个单周期时间分辨率为1.4 μ s的抽运探测系统，用于研究超快现象。首次对超快退相（T2 <10fs）多能级系统中的激发相干态进行了光学控制。为了进一步的超快响应，我们提出了一种新的技术，在非共振介质中混合信号和参考波之间的频率相干性。通过预啁啾脉冲之间的混频，产生了频域相位共轭的光脉冲，即时间反转的复制脉冲。该技术可用于飞秒光脉冲相位畸变的自动补偿。

The generation and detection of monocycle phenomena with no GDD control have been demonstrated by frequency coherence of the ultrabroadband and coherent light source covering from UV to IE, region. In the coherent transient phenomena, the nonlinear cross correlation between the two pump pulses can be used to control ultrafast transient phenomena. A pump-probe system based on the Frequency and fringe resolved nonlinear cross correlation having monocycle temporal resolution of 1.4 is was ma＆ to examine the ultra fast phenomena. Excited coherences in an ultra fast dephasing (T2 < 10 fs) multilevel system have been optically controlled for the first time. For further ultrafast response, we have proposed new technique that mixes the frequency coherence between the signal and reference waves in nonresonant media. The frequency domain phase conjugated light pulse, I.e. a time-reversed replica has been generated by the frequency mixing between pre-chirped pulses. The technique can be used for automatic compensation of phase distortion in a femtosecond light pulse.