Study Of Coherent Control With Sine Phase-modulated Polarization Shaped Femtosecond Pulse

Coherent control of atom and molecule system dynamics by femtosecond laser pulse shaping has been extensively studied during the last decades.In this work ionization of N₂O induced by sine phase modulated polarization femtosecond pulse is studied,in details,the coherent control of N₂O ionization is archived by changing parameter of sine phase A,T,?.Firstly,T scans under the condition of the same f and different A and ? scans of a same T while varying A are both studied and we found that different A only changes the intensity of sub pulses which simply lead a variation of intensity and has no periodic effect on the cycle curve of N₂O ionization yield during neither t scans nor ? scans,thus we draw a conclusion that the relative intensities between sub pulses has nothing but the whole intensity to change with the variation of N₂O ionization yield while changing other parameters.Also we scanned T with different ? while the same A,and we found out that with the shifty interval of adjacent sub pulses,the intensity of N₂O ionization performs some cyclic oscillation,and the phases of such cyclic oscillation change with the variation of parameter ?.analysis suggests the cyclic oscillation can be be ascribed to the inner phase differences of optical oscillation and different polarization between adjacent sub pulses?Following experiments off scans were done under the condition of a fixed A and different T,and we propose that a spectral focusing in the frequency domain induced by sine phase-modulated polarization femtosecond pulse lead to the periodicoscillation of N₂O ionization yield intensity.Also we investigated Xenon ionization intensity in the field of sine phase-modulated polarization femtosecond laser pulse variation with sinusoidally phase parameters A?T? ?,and it turns out to be feasible to archive the coherent control of Xe atom ionization as well.