全固态高功率Nd：YAG激光器及其二次与四次谐波产生的研究

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1、西北大学博士学位论文全固态高功率Nd：YAG激光器及其二次与四次谐波产生的研究姓名：李修申请学位级别：博士专业：光学指导教师：白晋涛20090612聚焦透镜焦距值后先用垂直切割的BBO晶体进行四倍频实验，在泵浦电流为33．2A时获得了607mW的紫外光输出。然后用以布儒斯特角切割的CLBO晶体分别进行了准连续紫外实验，获得了7．1W的266nm紫外光。最后分析了CLBO晶体的切割方式对四倍频效率的影响。关键词温度分布，数值模拟，允许角，CLBO晶体，BBO晶体，二次谐波，四次谐波AbstractLaserdiodepumpedall-solid—statelas

2、ershavemanyadvantages，suchaslightweight，compactness，efficiency,goodbeamquality,longlifetime，andSOon．Theyhavebeenappliedinthefieldsofmilitary,industry,medicaltreatment，researchandcommunication，andhavereplacedthetraditionallasers，likedye·laser,gas—laser,andSOon．Theapplicationoflaserhas

3、beenexpendedbyusingthenonlinearopticalfrequencyconversiontechnology．Forexample，11i曲powersolidstategreenlasershaveattractedmuchattentioninnumerousapplicationssuchaslasermedicine，laserdisplay,andSOon．Theultravioletlaser谢thshorterwavelengthhastheuniquesuperiorityinprecisionmachining，lit

4、hography,high—resolutionprinting．Themaincontentsofthisdissertationareasfollows，1．Theintensitydistributionofmulti-sidepumpedlighthasbeenanalyzedtheoretically,correspondingtodifferentpumpingparameters．Witllthethree—sidepumpedcondition,theheatconductequationhasbeenbuildup，andthetemperat

5、ureprofileinthegainmediumhasalsobeensimulated．Thentherelationbetweenthetemperaturegradientandthethermalfocallengthhasalsobeendiscussed，andthecompensationmethodsofthethermalfocallengthal'eprovided．Atlast，wecalculatetheoverlapintegralbetweenthepumpinglightandtheoscillatinglight，anddisc

6、usstheinfluencefactorsofthethresholdpumpingpowerandtheslopefficiency．2．Inthisdissertation，thepropertiesofseveralUVnonlinearopticalcrystalshasbeensummarized，andsomeparametersofthenegativeuniaxialopticalcrystalhasalsobeencalculated，suchasphasematchingangle，effectivenonlinearcoefficient

7、,anddiscussedsomeproblemsintheprocessofanglephasematching．ThenthemoisturepreventivemeasureoftheCLBOcrystalhasbeendiscussedaswell．3．Thetheoriesofsecond—harmonicgenerationwiththeplanewaveapproximationandthefocusedgaussianbeamhavebeendiscussed．Theselectionofthefocallengthofthefocusingle

8、nshasalsobee