兩束短脈沖激光驅(qū)動(dòng)O2分子的取向特性.pdf

1、西北師范大學(xué)碩士學(xué)位論文兩束短脈沖激光驅(qū)動(dòng)O2分子的取向特性姓名：張雪梅申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：原子與分子物理指導(dǎo)教師：周效信200806西北師范大學(xué)碩士學(xué)位論文AbstractWesimulatenumericallyrotationalwavepacketofhomonucleardiatomicmoleculesO2inshtpulselaserfieldbysolvingtimedependentSchrdingerequati

2、on(TDSE)throughthepseudospectralmethodalignmentofO2inducedbyshtpulselaserisinvestigatedtheetically.Underconditionofthesametemperaturewecontrastthealignmentdegreeinducedbyonepulsetwopulseslaserrespectively.Basingonabovein

3、troducedtheeticalmethodwefirstlycalculatealignmentofO2producedbytwoshtpulselaserwiththesameduration.wedivideonelaserpulsewithtotalintensityintotwopulseswithpulseduration1421.510WcmΙ=50fsUnderthesameenvironmentaltemperatu

4、recomparedtoalignmentdrivedbysinglepulselaserfieldthedegreeofalignmentisenhancedeffectivelybyoperatingintensityratiodelaytimeoftwopulses.Theresultsshowthatdegreeofalignmentachievesmaximumwithintensityratioapproximatelyde

5、laytime1:311.73ps.Besideswestudytheeffectsofpulsedurationonmolecule.Comparedtoalignmentinducedbytwopulseswiththesamedurationthedegreeofalignmentisenhancedeffectivelybyoptimizingintensityratiodurationdelaytimeoftwopulses.

6、whenintensityratioislessthan2:degreeofalignmentisalwaysmaximumwhendurationofthesecondpulseisabout150fsthealignmentparametermaximumreachesoptimalvaluewithdurationofthefirstpulseis125fsanoptimaldurationofthefirstpulseexist