QUANTUM Fluctuation in small laser USC.pdf

QUANTUM Fluctuation in small laser USC.pdf

ID:34568809

大小:5.01 MB

页数:45页

时间:2019-03-08

QUANTUM Fluctuation in small laser USC.pdf_第1页
QUANTUM Fluctuation in small laser USC.pdf_第2页
QUANTUM Fluctuation in small laser USC.pdf_第3页
QUANTUM Fluctuation in small laser USC.pdf_第4页
QUANTUM Fluctuation in small laser USC.pdf_第5页
资源描述:

《QUANTUM Fluctuation in small laser USC.pdf》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、QuantumfluctuationsinsmalllasersA.F.J.LeviEPFLColloquium,July29,20091ThelaserdiodeCoherentlightLaserdiode,LDIthLight,LIncoherentlightLightemittingdiode,LEDCurrent,I•Photonsexperiencenon-linearthresholdbehaviortransitioningfromdisorderedlight(spontaneousemission)toorderedlight(st

2、imulatedemission)withincreasingpumpcurrent•Activevolume300x0.14x0.8m3=34x10-12cm-3=34m3•I=3mA,=2x107,=105,=10-4,7psphotoncavityround-thtrip•Existingmean-fieldtheories(rateequationsandGaussiannoise-Langevin)appliestotheselargesystems2Askasimplequestion:Whendophotonsknowt

3、heyareinalaser?3Whendophotonsknowtheyareinalaser?•NOTonecavityround-trip•Cavityformationtakesmanyphotonroundtrips•AdiabaticallydecoupleelectrondynamicsinexperimentbyusinglargecavityLDLED4Whendophotonsknowtheyareinalaser?•NOTonecavityround-trip•Cavityformationtakesmanyphotonround

4、trips•SpectralpurityLDLED5Askasimplequestion:Howdophotonfluctuationsbelowthresholdimpactlasingemission?6FluctuationsenhancelightoutputbelowIth•ExperimentallyLDcompareLEDandLDusingSAMEgeometryandactiveregion•ARcoatLDtomakeLED•Landau-Ginzburgphasetransitionanalogyforbulkwithbelow-

5、thresholdLEDfluctuationsintothelasingstate•Intensityfluctuationsscaleas1/(T/T–1)C•Experimentally=1.04,T=301.4KC7Fluctuationsandcarrierpinning•ExperimentallycompareLEDandLDusingSAMEgeometryandactiveregion•ARcoatLDtomakeLED•CarriernumbernfromL(spontaneousWemission)•Fluctuationsi

6、nphotonssremovecarriersbelowthresholdandcontributetothetemperaturedependenceoflaserdiodethresholdcurrent,Ith•Thereisacontribution,I,tothethresholdcurrentIflth8Summarysofar:Photonfluctuationsinlargelaserdiodes:EnhancelasingemissionbelowthethresholdcurrentRemovecarriersbelowthethr

7、esholdcurrentContributetothetemperaturedependenceofthelaserdiodethresholdcurrentPhotonfluctuationsareimportant!9FluctuationsdescribedbyLangevinequationsCarrierrecombinationrateeSinglemode,singlefrequencylaserdioderateequationsinthepresenceofnoise,FBRadiativerecombinationrated

8、nIIInjectioncurrentGsnF(t),Equationgover

当前文档最多预览五页,下载文档查看全文

此文档下载收益归作者所有

当前文档最多预览五页,下载文档查看全文
温馨提示:
1. 部分包含数学公式或PPT动画的文件,查看预览时可能会显示错乱或异常,文件下载后无此问题,请放心下载。
2. 本文档由用户上传,版权归属用户,天天文库负责整理代发布。如果您对本文档版权有争议请及时联系客服。
3. 下载前请仔细阅读文档内容,确认文档内容符合您的需求后进行下载,若出现内容与标题不符可向本站投诉处理。
4. 下载文档时可能由于网络波动等原因无法下载或下载错误,付费完成后未能成功下载的用户请联系客服处理。