Study of coherent transient phenomena coupling entire light wavelength region

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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.