最新激光原理(英文)PPT课件.ppt

《最新激光原理(英文)PPT课件.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、LaseroscillationLaserisoscillatorLikeservowithpositivefeedbackGreaterthanunitygainRubylaserexampleLaserturn-onandgainsaturationLasergainandlossesGaindecreasesasoutputpowerincreasesSaturationFabry-PerotcavityforfeedbackHighreflectivitymirrorsLowlossperroundtri

2、pMustrememberresonanceconditionsroundtrippathismultipleoflHighreflectivityFabry-PerotcavityBoundaryconditionsfieldiszeroonmirrorsMultiplewavelengthspossibleagreeswithresonanceconditionsLaserlongitudinalmodesClassicalmechanicsanalogMulti-modelaserFabry-Perotbo

3、undaryconditionsMultipleresonantfrequenciesSinglelongitudinalmodelasersInsertetalonintocavityUselowreflectivityetalonlowlossLasertransversemodesWaveequationlookslikeharmonicoscillatorEx:E=Ee-iwtSeparateoutzdependenceSolutionsforxandyareHermitepolynomialsFrequ

4、enciesoftransversemodesTransverselasermodesSingletransversemodelasersPutapertureinlaserCreatelossforhigherordermodesMulti-longitudinalMulti-transverse&long.SinglemodeGaussianbeamsZeroordermodeisGaussianIntensityprofile:beamwaist:w0confocalparameter:zfarfromwa

5、istdivergenceangleGaussianpropagationPowerdistributioninGaussianIntensitydistribution:Experimentallytomeasurefullwidthathalfmaximum(FWHM)diameterRelationisdFWHM=w2ln2~1.4wDefineaverageintensityIavg=4P/(pd2FWHM)Overestimatespeak:I0=Iavg/1.4ResonatoroptionsBes

6、tknown--planar,concentric,confocalConfocaluniquemirroralignmentnotcriticalpositioniscriticaltransversemodefrequenciesidenticalTypesofresonatorsSpecialcases结束语谢谢大家聆听！！！11