新型滤波器件的研究【优秀毕业设计】

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1、本科毕业设计（20届）新型滤波器件的研究摘　要【摘要】用标准水溶液法生长出的长30.62mm、宽29.20mm、高28.34mm的大尺寸氯酸钠晶体，用线偏振的3He-Ne激光入射到氯酸钠晶体，使在其内部以Brewster角内反射并再经过全反射出射。从理论和实验的两方面对该大尺寸氯酸钠晶体内反射时的偏振特性做了研究，发现在消光位置，氯酸钠晶体入射光的偏振取向较之普通玻璃的入射光偏振取向旋过了87.43°。同时，基于氯酸钠晶体的各向同性和旋光色散特性，首次利用线偏振光以Brewster角内反射时P分量反射率为零的特性，研制出一种新型内反射旋

2、光光学滤波器，该光学滤波器仅需采用单个偏振片，即可达到良好的滤波效果。利用Mueller矩阵对该滤波器的滤波特性进行理论分析以及实验测试，结果表明对含有532nm和632.8nm谱线的线偏振光，改变起偏器角度即可连续调制出射红、绿光的光强，当起偏器较初始位置旋转过133.36°和173.06°时，绿光和红光分别消光，绿光和红光的隔离度可达10dB。另外，测试了该滤波器对一般带状光谱的滤波效果，得出通过旋转起偏器，能够连续调制出射光谱线的峰值波长。【关键词】光学滤波器；各向同性；布儒斯特角；内反射。3Abstract【ABSTRACT】T

3、helarge-sizedcube-shapedcrystalsofsodiumchloratewiththedimensionof30.62cm×29.20cm×28.34mmisgrownbyusingstandardaqueoussolution.ForthepolarizedHe-Nelaserlightincidentuponthesodiumchloratecrystal,wemakeitaccomplishtwotimesinternalreflection:firstatitsinternalBrewsterangleo

4、f33.42°andthenattotalreflectionangle.Forthefirsttimeweinvestigatethepolarizationcharacteristicoflightinthecaseofabovecoursebytheoryandexperiment.Attheextinctionposition,itisfoundthatthepolarizedtropismoflightincidentuponthesodiumchloratecrystalisrotatedattheangleof87.43°

5、comparedwithlightincidentupontheglass.Atthesametime,Basedontheopticalrotatorydispersionandtheisotropicofthesodiumchloratecrystals,anewtypeofopticalfilterbyinternalreflectionandopticalrotationisfirstlydeveloped.Duetothespecialityofthezeroreflectivitywhenthelinearlypolariz

6、edlightisreflectedatBrewsterangle,theopticalfiltercanobtainagoodfilteringeffectbyusingonlysingle-polarizer.AnalysethefilteringcharacteristicsbyMuellermatrixandthroughtheexperimentaltest.ThefilteringcharacteristicsisanalyzedbyMuellermatrixandtestedbyexperiment.Theresultss

7、howthattheintensityofemittedredorgreenlightcanbecontinuouslymodulatedbychangingtheangleofthepolarizer.Theextinctionofgreenorredlightappearswhentherotateangleofthepolarizerisrespectivelyat133.36°or173.06°relativetotheinitialposition.Theisolationofgreenandredcanbeabout10dB

8、.Inaddition,theperformanceoftheopticalfilterforbandspectrumistasted.Itisfoundthepeakwavelengthcanbemodu