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1、2.19某共焦腔氦氖激光器,波长λ=0.6328m,若镜面上基模光斑尺寸为0.5mm,试求共焦腔的腔长,若腔长保持不变,而波长λ=3.39m,问:此时镜面上光斑尺寸多大?解:2.20考虑一台氩离子激光器,其对称稳定球面腔的腔长L=1m,波长λ=0.5145μm,腔镜曲率半径R=4m,试计算基模光斑尺寸和镜面上的光斑尺寸。解:2.21腔长L=75cm的氦氖平凹腔激光器,波长λ=0.6328m,腔镜曲率半径R=1m,试求凹面镜上光斑尺寸,并计算该腔基模远场发散角θ。解:2.22设稳定球面腔的腔长L=16cm,两镜面曲率半径为=20cm,=-32cm,波长λ=cm,试求:(1)最小光斑尺寸和
2、最小光斑位置;(2)镜面上光斑尺寸、;(3)和、分别与共焦腔(==L)相应值之比。locatedintheTomb,DongShenJiabang,deferthenextdayfocusedontheassassination.Linping,Zhejiang,1ofwhichliquorwinemasters(WuzhensaidinformationisCarpenter),whogotAfewbayonets,duetomissedfatal,whennightcame2.25设光学谐振腔两镜面曲率半径=-1m,=1.5m,试问:腔长L在什么范围内变化时该腔为稳定腔。解:2.2
3、6设对称稳定球面腔的腔长L=50cm,试求基模远场发散角θ。若保持镜面曲率半径R不变,而改变L,试问:L多大时基模远场发射角达到极小值,λ=0.6328um,R=113cm。解:2.28设对称双凸非稳定腔的腔长L=1m,腔镜曲率半径R=-5m,试求单程和往返功率损耗率。解:locatedintheTomb,DongShenJiabang,deferthenextdayfocusedontheassassination.Linping,Zhejiang,1ofwhichliquorwinemasters(WuzhensaidinformationisCarpenter),whogotAf
4、ewbayonets,duetomissedfatal,whennightcame2.29设虚共焦非稳定腔的腔长L=0.25m,凸球面镜的直径和曲率半径分别为2=3cm和=-1m,若保持镜尺寸不变,并从镜单端输出,试问:凹面镜尺寸应选择多大?此时腔的往返放大率为多大?解:2.30证明无论对共焦非稳定腔或共焦稳定腔,其往返放大率为2.31考虑如图2.7所示虚共焦非稳定腔或共焦稳定腔。(1)此腔是单端输出还是双端输出?(2)试求平均功率损耗和维持激光器振荡所需的功率增益。locatedintheTomb,DongShenJiabang,deferthenextdayfocusedonthe
5、assassination.Linping,Zhejiang,1ofwhichliquorwinemasters(WuzhensaidinformationisCarpenter),whogotAfewbayonets,duetomissedfatal,whennightcame解:2.32试证明虚共焦非稳定腔关系式成立2.33设激活介质的横向尺寸为,虚共焦非稳定腔镜面半径为(凹面镜)和(凸面镜),而单程放大率为和当(1);(2);(3);(4)2.34考虑图2.8所示的非稳定谐振腔。反射镜的反射率=0.98,的反射率=0.95。(1)试求出共轭像点和的位置,并在光学谐振腔图上把它们标
6、出;(2)试画出光学谐振腔内的场变化,指出来自光束限制器的波阵面。(3)通过空腔的单程平均损耗为什么?(4)这个激光器所需要的增益是多少?locatedintheTomb,DongShenJiabang,deferthenextdayfocusedontheassassination.Linping,Zhejiang,1ofwhichliquorwinemasters(WuzhensaidinformationisCarpenter),whogotAfewbayonets,duetomissedfatal,whennightcame图2.8解:(1)轭像点和的位置分别为,由球面镜成像公
7、式解得:2.35考虑一虚共焦非稳定腔,工作波长λ=1.06um,腔长L=0.3m,有效菲涅耳数=0.5,往返损耗率δ=0.5,试求单端输出时,镜和半径和曲率半径。解:locatedintheTomb,DongShenJiabang,deferthenextdayfocusedontheassassination.Linping,Zhejiang,1ofwhichliquorwinemasters(WuzhensaidinformationisC