超短脉冲照射下体光栅衍射的研究

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1、上海大学硕士学位论文超短脉冲照射下体光栅衍射的研究姓名：杨晨申请学位级别：硕士专业：光学指导教师：阎晓娜20080501上海大学硕士学位论文AbstractWiththerapiddevelopmentofinformationtechnologyandtheexponentialgrowthofinformationquantity,thecapacityofstorageandprocessingofelectronsencountersseriousproblems．Photon，asallinformationcarrier,hashugeinformationstor

2、agecapacityandrapidresponsetime．Therefore，muchattentionhasbeenpaidontheopticalinformationprocessing，andthosebasedonvolumegratingshavealsobeenoneofthehotresearchtopic．Thewidelyuseofvolumegratingreliednotonlyontheerectingofcoupled—wavetheoryofKogelrfik,butalsoontheimprovementofmanufacturingtec

3、hniqueofvolumegratings．Recentyears．、析tlltherapiddevelopmentoffemtosecondpulselaser,peopleusefemtosecondpulsetoinducegratingandusethevolumegratingtopulseshaping．Inthisthesis，Istudiedthediffractionoffemtosecondpulsefromvolumegrating，anditmainlyincludestwofollowingparts：(1)Inthedispersionmateri

4、al，westudiedthediffractionefficiencyanddiffractionintensityspectrumofthetransmissionholographicvolumegratingunderfemtosecondillumination．BasedontheKogelnik’Sdiffractionefficiencyequationforcontinuouslight，wededucedthediffractionintensityspectrumandthediffractionefficiencyoftransmissionvolume

5、gratingbyfemtosecondpulselaser．Inthispaper,takingphotorefractiveInP：Fecrystalasanexample，thediffractionpropertieswithandwithoutcrystalmaterialdispersionarecompared．WeanalyzedtherelationshipbetweenthediffractionpropertiesandgratingspacingA，thegratingthicknessdandthepulsewidthAr．Theresultshows

6、thatthedispersionwilldecreasethediffractionintensity．Especially,whenArandgratingspacingaresmallerorthegratingthicknessarelarger,theinfluenceofdispersionondiffractionarelarge．(2)Westudiedthevariationsofthediffractedandtransmittedpulseswithtimewhenthetransmissionvolumegratingisilluminatedbyfem

7、tosecondpulse．BasedonKogelnikcoupledwavetheory,theequationsofthediffractedandtransmittedpulseswithtimearededuced．WhenincreasingthevalueofmodulationoftherefractiveindexAn0，wefindthenumberofdiffractionpulsechangesfromonepulsetotwopulses，thentOthreepu