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1、分類號(hào):00433UDC:530密級(jí):坌五編號(hào):飛秒激光在石英玻璃及氟化鋇中產(chǎn)生超連續(xù)輻射的研究STUDYoNSUPERCONTINUUMSPECTRUMINFUSEDSILICAANDBARIUMFLUORIDEBYFEMToSECONDLASER學(xué)位授予單位及代碼:拯鲞堡王太堂(!Q!墨魚(yú)2研究方向:堂電王堂皇光電王堇盔申請(qǐng)學(xué)位級(jí)別:亟±論文起止時(shí)間:2012.9—2013.12摘要近年來(lái),隨著超強(qiáng)超快激光技術(shù)的不斷提高,強(qiáng)光與物質(zhì)作用的研究范圍得到了拓展,飛秒激光在透明光學(xué)介質(zhì)中成絲的物理現(xiàn)象給非線性光學(xué)領(lǐng)域帶來(lái)了一場(chǎng)新的革命。本論文首先從飛秒激光脈沖在非線性光學(xué)介
2、質(zhì)中產(chǎn)生超連續(xù)輻射的現(xiàn)象開(kāi)始介紹,描述了飛秒激光超連續(xù)的國(guó)內(nèi)外發(fā)展現(xiàn)況,以及超連續(xù)的應(yīng)用;接著闡述了飛秒激光超連續(xù)產(chǎn)生的理論機(jī)制,主要包括科爾自聚焦、自相位調(diào)制、多光子電離等;并且指出了固體光學(xué)介質(zhì)中強(qiáng)激光成絲的優(yōu)勢(shì)。實(shí)驗(yàn)方面,研究了飛秒激光在石英玻璃中成絲的性質(zhì),說(shuō)明了其物理現(xiàn)象的產(chǎn)生原因。對(duì)于氟化鋇晶體中超連續(xù)輻射的產(chǎn)生進(jìn)行了實(shí)驗(yàn)研究,并通過(guò)改變實(shí)驗(yàn)參數(shù)(入射光偏振態(tài)、入射光能量、透鏡焦距等)對(duì)實(shí)驗(yàn)結(jié)果進(jìn)行了規(guī)律性的探索,探討了控制氟化鋇晶體中飛秒激光成絲的新方法。關(guān)鍵詞:飛秒激光超連續(xù)石英玻璃氟化鋇晶體AbstractInrecentyears,withthedev
3、elopmentoftheintenseulrtrashortpulselasertechnology,thefieldoftheinteractionofintenselaserwithopticmediumhadbeenwidelydeveloped.Thephenomenonoffilamentmionintransparentmediumbyfemetosecondlasercausedarevolutionofnon—linearoptics.Thispaperfirstlybeginwiththefilamentationinnonlinearopticmed
4、ia,introducethedevelopmentofsupercontinuuminlandandabroad,andtheapplicationofsupercontinuum.Andthenthemechanismofthegenerationoffemtosecondsupercontinuum.Suchastheself-focusing,selfphasemodulation,multiphotonionizationandSOon.Thenintroducetheadvantageoffilemantationinsolidopticmedia.Descr
5、ibethecharacteroffilamentmioninfusedsilica,andthenexplainthephysicalphenomenonproducedinfusedsilica.Describethesupercontinuuminbariumfluoride,andweexploretheruleofthephenomenonbychangingtheparametersofexperimentalfacilities,thendiscussthenewwaytocontrolthebeginningoffilamentation.Keywords
6、:femtosecondlasersupercontinuumfusedsilicabariumfluoride目錄摘要Abstract第一章緒論?????????????????????????????????。11.1引言???????????????????????????????..11.2飛秒激光成絲概述?????????????????????????一11.3飛秒激光在透明介質(zhì)中傳輸形成等離子體絲的演化過(guò)程?????????..21.4飛秒激光在透明介質(zhì)中傳輸形成等離子體絲的研究現(xiàn)狀?????????..31.5飛秒激光技術(shù)的應(yīng)用??????????????
7、??????????一41.6本論文的工作???????????????????????????..71.7本章小結(jié)?????????????????????????????一8第二章飛秒激光超連續(xù)輻射產(chǎn)生機(jī)制?????????????????????.92.1引言???????????????????????????????一92.2衍射與空間一時(shí)間散焦???????????????????????102.3群速度色散和高階衍射作用?????????????????????112.4自聚焦??????????????????