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《用于眼底治疗的全固态绿光激光器研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、摘要532nm绿光能被黑色素和血红蛋白大量地吸收,而被叶黄素吸收较少,因而对黄斑损害小,适于治疗视网膜周围血管病,尤其适合眼内手术应用,在医学领域有着广阔的发展前景。目前,绿光在眼科的应用已经得到广泛的研究,并用于临床医学。激光二极管(LD)泵浦的全固态激光器具有效率高、光束质量好、结构紧凑、寿命长等优点,对医疗激光器的小型化、高效性和稳定性有着重要的意义。但是,在眼科学上,国内采用LD泵浦的绿光激光器仍不多见,技术上还不成熟,大大限制了它的应用。本文针对眼底治疗的要求,对全固态的绿光激光器进行了
2、系统研究。主要内容概括如下:(1)对LD端面泵浦的激光器进行了系统的理论研究,分析了泵浦光与振荡光的空间场分布,计算了阈值泵浦功率和输入输出关系,研究了端面泵浦激光器的腔模设计原则,给出了一定泵浦功率和强度分布下激光腔模尺寸的选取依据。(2)根据LD光源的特性,设计了相应的耦合系统,即用自聚焦透镜实现LD泵浦光与激光工作物质之间的高效耦合。(3)根据课题要求及实际需要,设计了用KTP晶体对Nd:YAG基频光进行腔内倍频的激光系统,提出了LD端面泵浦绿光激光器的实验方案,设计了实验装置。(4)在研究
3、所用光源的光学特性后,设计传导光路,能够配合市面上标准的裂隙灯,准确到达眼睛被治疗的部位。关键词:眼底治疗全固态端面泵浦绿光IAbstractSincethe532nmgreenlightcouldbeheavilyabsorbedbymelaninandhemoglobinwhileonlyasmallportionisabsorbedbylutein,itdoeslittleharmtotheyellowspot.Itispropertobeappliedintheangiomatreatme
4、ntaroundtheretina,especiallyinthesurgeryineye.Thereforeithasabrightfutureinthemedicalfield.Uptonow,theapplicationofthegreenlightinophthalmologyhasbeenwidelystudied;furthermore,ithasbeenusedinclinicalmedicine.LaserDiodepumpedallsolid-statelasers,whichh
5、astheadvantagesofhighconversionefficiency,excellentbeam,compactstructure,longlifetimeandsoon,isofgreatimportancefortheminiaturization,highefficiency,andstabilityofmedicaltreatmentequipments.However,LaserDiodepumpedgreenlightforophthalmologyhasnotbeenc
6、omprehensivelyresearchedinteriorly,andthecorrelativetechnologyisunmatured,whichgreatlylimitsitsapplication.Tosatisfytheneedoffundusoculidiseasetreatment,wesystemicallystudiedallsolid-statedgreenlasers.Theprimarycontentreadsasfollows:(1)Thetheoryofdiod
7、eend-pumpedlaserwassystemicallystudied,thespecialfielddistributionofthepumpinglightandoscillatinglightwasanalyzed,thethresholdpumpingpowerandtherelationbetweentheoutputpowerandtheinputpowerwerecalculated,theruleofcavitymodedesignwasresearched,andtheba
8、seofdesigningthelasercavitymodeundergivenpumppowerandintensitydistributionwaspresented.(2)Accordingtothecharacteristicofthelightsource,thecoupledsystemisdesigned,usingaself-focusinglentorealizethehighefficiencycouplebetweenthelaserdiodeandlasi