光电子学-九

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1、Lecture9§5.6Hole-BurningandTheLambDipinDoppler-BroadenedGasLaserI.DopplerEffect§5.6Hole-BurningandTheLambDipinDoppler-BroadenedGasLaserII.Hole-Burning0Assumelaseroscillateat§5.6Hole-BurningandTheLambDipinDoppler-BroadenedGasLaserIII.LambDip0§5.7MultimodeLaserOsci

2、llationandModeLockingI.ModeCompetitioninHomogeneousBroadeningLaserA)ModeSelection123PassiveOpticalResonatorHomogeneousBroadeningLaserTheidealhomogeneousbroadenedlasercanoscillatoronlyatasinglefrequencyclosetoSelfgainsaturationGainsaturationfromothersB)Multimode

3、Oscillationduetospatialholeburning§5.7MultimodeLaserOscillationandModeLockingLongitudinalmodespatialcompetitionGasLaser,rapidmovementeliminatesspatialholeburningSinglemodeonlyInsolidstateLaser,spatialholeburningexistMultimodepossibleII.MultimodeOscillationinInhom

4、ogeneousBroadeningLaser§5.7MultimodeLaserOscillationandModeLocking21PassiveOpticalResonatorInhomogeneousBroadeningLaser3when,andcompetetoeachotherModecompetitionoccursatoscillationmodessharethesamepartofinversionparticles,forexample:III.MethodsforModeSelecting§

5、5.7MultimodeLaserOscillationandModeLockingTransverseModeSelection--selectfundamentalmodedepresshighordermodesTEM001.ResonatorparameterselectionMetastablecavity3.Smallholeirisselection2.UnstableresonatorselectionSuitforhighgainmediaB)LongitudinalModeSelection--sel

6、ectsinglelongitudinalfrequency§5.7MultimodeLaserOscillationandModeLocking1.ShortLengthResonator2.TravelingWaveResonatorNospatialholeburningexists3.FPEtalon4.HybridResonatorFox-SmithinterferometerL2L3IV.FrequencyStabilization§5.7MultimodeLaserOscillationandModeLoc

7、kingPassivefrequencystabilizationFeedbackthroughelectriccircuitsFeedbackthroughGeometryProperties稳定度复现性ActivefrequencystabilizationA)稳定性的度量B)稳定方法1.LambDipMethod光电接收选频放大相敏检测直流放大调制升压整流音频振荡PZT§5.7MultimodeLaserOscillationandModeLockingABCunchangestrengthcompress频率位置

8、音频频率激光功率振荡频率PZT电压腔长变化2.ZeemanFrequencyStabilization§5.7MultimodeLaserOscillationandModeL