Ua hauj lwm hauv paus ntsiab lus ntawm semiconductor laser

Ua hauj lwm hauv paus ntsiab lus ntawmsemiconductor laser

Ua ntej tshaj plaws, cov kev cai parameter rau semiconductor lasers tau qhia, feem ntau suav nrog cov hauv qab no:
1. Photoelectric kev ua tau zoo: suav nrog kev ploj tuag piv, dynamic linewidth thiab lwm yam tsis muaj, cov tsis muaj kev cuam tshuam ncaj qha rau kev ua haujlwm ntawm semiconductor lasers hauv kev sib txuas lus.
2. Cov yam ntxwv tsis zoo: xws li luminous loj thiab kev teeb tsa, kev rho tawm qhov kawg txhais, kev teeb tsa loj thiab qhov loj me.
3. Wavelength: Lub wavelength ntau ntawm semiconductor laser yog 650 ~ 1650nm, thiab qhov tseeb yog siab.
4. Qhov chaw pib tam sim no (Ith) thiab kev khiav hauj lwm tam sim no (lop): Cov kev ntsuas no txiav txim siab qhov pib ua haujlwm thiab lub xeev ua haujlwm ntawm lub tshuab hluav taws xob semiconductor.
5. Lub zog thiab qhov hluav taws xob: Los ntawm kev ntsuas lub zog, qhov hluav taws xob thiab tam sim no ntawm lub semiconductor laser ntawm kev ua haujlwm, PV, PI thiab IV nkhaus tuaj yeem kos kom nkag siab txog lawv cov yam ntxwv ua haujlwm.

Txoj cai ua haujlwm
1. Tau txais tej yam kev mob: Lub inversion faib ntawm tus nqi nqa khoom nyob rau hauv lub lasing nruab nrab (ib cheeb tsam nquag) yog tsim. Nyob rau hauv lub semiconductor, lub zog ntawm electrons yog sawv cev los ntawm ib tug series ntawm yuav luag tas zog zog theem. Yog li ntawd, tus naj npawb ntawm cov electrons nyob rau hauv qab ntawm lub conduction band nyob rau hauv lub high zog lub xeev yuav tsum tau ntau npaum li cas loj tshaj tus naj npawb ntawm lub qhov nyob rau hauv lub sab saum toj ntawm lub valence band nyob rau hauv lub low-power xeev ntawm ob lub zog band cheeb tsam kom ua tiav cov inversion ntawm tus lej particle. Qhov no yog ua tiav los ntawm kev siv qhov kev tsis ncaj ncees rau homojunction lossis heterojunction thiab txhaj cov khoom tsim nyog rau hauv cov txheej txheem ua kom muaj zog electrons los ntawm qis zog valence band mus rau lub zog hluav taws xob ntau dua. Thaum ib tug loj tus naj npawb ntawm electrons nyob rau hauv lub reversed particle pej xeem lub xeev recombine nrog lub qhov, stimulated emission tshwm sim.
2. Txhawm rau kom tau txais cov hluav taws xob sib txuas ua ke, cov hluav taws xob tsim hluav taws xob yuav tsum tau pub rov qab ob peb zaug hauv qhov kho qhov muag resonator los ua laser oscillation, lub resonator ntawm lub laser yog tsim los ntawm lub ntuj cleavage nto ntawm semiconductor siv lead ua iav, feem ntau plated nyob rau hauv qhov kawg ntawm lub teeb nrog ib tug high reflection multilayer dielectric zaj duab xis, thiab tus du nto yog plated nrog ib tug txo reflection zaj duab xis. Rau Fp kab noj hniav (Fabry-Perot kab noj hniav) semiconductor laser, FP kab noj hniav tuaj yeem tsim tau yooj yim los ntawm kev siv lub dav hlau cleavage perpendicular mus rau pn hlws ris dav hlau ntawm cov siv lead ua.
(3) Txhawm rau tsim kom muaj kev ruaj khov oscillation, lub laser nruab nrab yuav tsum muaj peev xwm muab qhov loj txaus kom them rau qhov poob ntawm qhov muag los ntawm lub resonator thiab qhov poob los ntawm lub laser tso tawm los ntawm cov kab noj hniav nto, thiab tas li nce lub light field nyob rau hauv kab noj hniav. Qhov no yuav tsum muaj zog txaus tam sim no txhaj tshuaj, uas yog, muaj txaus particle tooj inversion, qhov siab dua ntawm particle tus lej inversion, qhov ntau dua qhov nce, uas yog, qhov yuav tsum tau ua kom tau raws li qhov yuav tsum tau ua tam sim no. Thaum lub laser ncav cuag qhov pib, lub teeb nrog ib lub wavelength tshwj xeeb tuaj yeem tshwm sim hauv cov kab noj hniav thiab nthuav dav, thiab thaum kawg tsim lub laser thiab cov zis tas li.

Kev ua tau zoo xav tau
1. Modulation bandwidth thiab tus nqi: semiconductor lasers thiab lawv cov tshuab hloov kho yog qhov tseem ceeb hauv kev sib txuas lus wireless, thiab qhov hloov pauv bandwidth thiab tus nqi ncaj qha cuam tshuam rau kev sib txuas lus zoo. Internally modulated laser (ncaj qha modulated laser) yog tsim rau ntau qhov chaw hauv kev sib txuas lus fiber ntau optical vim nws txoj kev sib kis ceev thiab tus nqi qis.
2. Spectral yam ntxwv thiab cov yam ntxwv ntawm kev hloov pauv: Semiconductor faib tawm tswv yim lasers (DFB laser) tau dhau los ua lub teeb ci tseem ceeb hauv kev sib txuas lus fiber ntau thiab qhov chaw kho qhov muag vim lawv cov yam ntxwv zoo heev thiab cov yam ntxwv ntawm kev hloov kho.
3. Tus nqi thiab ntau lawm: Semiconductor lasers yuav tsum muaj qhov zoo ntawm cov nqi qis thiab ntau lawm kom tau raws li cov kev xav tau ntawm cov khoom loj thiab kev siv.
4. Kev siv hluav taws xob thiab kev ntseeg siab: Hauv cov ntawv thov scenarios xws li cov chaw zov me nyuam, semiconductor lasers yuav tsum tau siv hluav taws xob tsawg thiab muaj kev ntseeg siab kom ua haujlwm ruaj khov mus ntev.