Umgaqo osebenzayo we-laser semiconductor

Umgaqo wokusebenza wesemiconductor laser

Okokuqala, iimfuno zeeparamitha ze-lasemiconductor lasers ziyaziswa, ngakumbi kubandakanya le miba ilandelayo:
1. Ukusebenza kwe-Photoelectric: kubandakanywa ukutshatyalaliswa kwe-extinction ratio, i-linewidth eguquguqukayo kunye nezinye iiparitha, ezi pharamitha zichaphazela ngokuthe ngqo ukusebenza kwe-lasemiconductor lasers kwiinkqubo zonxibelelwano.
2. Iiparamitha zesakhiwo: ezifana nobukhulu obukhanyayo kunye nokuhlelwa, inkcazo yokuphela kwe-extraction, ubungakanani bofakelo kunye nobukhulu benkcazo.
3. Ubude be-wavelength: Uluhlu lwe-wavelength ye-laser semiconductor yi-650 ~ 1650nm, kwaye ukuchaneka kuphezulu.
4. I-Threshold current (Ith) kunye ne-operating current (lop) : Ezi parameters zinquma iimeko zokuqalisa kunye nemeko yokusebenza ye-laser semiconductor.
5. Amandla kunye nombane: Ngokulinganisa amandla, i-voltage kunye ne-current laser semiconductor emsebenzini, i-PV, i-PI kunye ne-IV curves inokutsalwa ukuqonda iimpawu zabo zokusebenza.

Umgaqo wokusebenza
1. Iimeko zokufumana: Ukuhanjiswa kwe-inversion yabathwali bentlawulo kwi-lasing medium (ummandla osebenzayo) kusekwe. Kwi-semiconductor, amandla eelektroni amelwe luluhlu lwamanqanaba aphantse aqhubekeka amandla. Ke ngoko, inani leelekhtroni ezantsi kwebhendi yokuqhuba kwindawo ephezulu yamandla kufuneka ibe nkulu kakhulu kunenani lemingxunya engaphezulu kwebhanti yevalence kwindawo ephantsi yamandla phakathi kwemimandla emibini yebhanti yamandla ukufezekisa ukuguqulwa inani lesuntswana. Oku kuphunyezwa ngokusebenzisa i-bias efanelekileyo kwi-homojunction okanye i-heterojunction kunye nokutofa abathwali abayimfuneko kwi-maleko esebenzayo ukuvuyisa ii-electron ukusuka kwi-valence band yamandla ephantsi ukuya kwinqanaba eliphezulu lokuqhuba amandla. Xa inani elikhulu leelektroni kwimo yamasuntswana eguqulweyo iphinda ihlangane kunye nemingxuma, ukukhutshwa okuvuselelweyo kwenzeka.
2. Ukuze ngokwenene ufumane ukusasazeka kwemitha ehambelanayo, i-radiation evuselelweyo kufuneka yondliwe ngamaxesha amaninzi kwi-resonator optical ukwenza i-laser oscillation, i-resonator ye-laser yenziwa ngumphezulu wendalo we-crystal semiconductor njengesipili, ngokuqhelekileyo. ifakwe ekupheleni kokukhanya kunye nefilimu ye-dielectric ebonisa i-multilayer ephezulu, kunye ne-smooth surface ifakwe kwifilimu yokunciphisa. Kwi-Fp cavity (i-Fabry-Perot cavity) i-semiconductor laser, i-FP cavity inokwakhiwa ngokulula ngokusebenzisa i-natural cleavage plane perpendicular to pn junction plane ye-crystal.
(3) Ukuze wenze i-oscillation ezinzileyo, i-laser medium kufuneka ikwazi ukubonelela ngenzuzo enkulu ngokwaneleyo ukuhlawulela ilahleko ye-optical ebangelwa yi-resonator kunye nelahleko ebangelwa yi-laser yemveliso evela kumphezulu womgodi, kwaye inyuse rhoqo ibala elikhanyayo kumgodi. Oku kufuneka kube nenaliti enamandla ngokwaneleyo yangoku, oko kukuthi, kukho inani elaneleyo lokuguqulwa kwenombolo, iqondo eliphezulu lokuguqulwa kwenani lesuntswana, inzuzo enkulu, oko kukuthi, imfuno kufuneka ihlangabezane nemeko ethile yangoku. Xa i-laser ifikelela embundwini, ukukhanya kunye ne-wavelength ethile kunokutshintshwa kwi-cavity kwaye ikhuliswe, kwaye ekugqibeleni yenza i-laser kunye nemveliso eqhubekayo.

Imfuneko yokusebenza
1. I-bandwidth ye-modulation kunye nereyithi: i-laser ye-semiconductor kunye ne-teknoloji yokumodareyitha ibalulekile kunxibelelwano lwe-wireless optical, kunye ne-modulation bandwidth kunye nereyithi ichaphazela ngqo umgangatho wonxibelelwano. Ilaser emoduliweyo yangaphakathi (laser modulated ngqo) ifanelekile kwiinkalo ezahlukeneyo kunxibelelwano lwefiber optical ngenxa yokuhanjiswa kwayo ngesantya esiphezulu kunye neendleko eziphantsi.
2. Iimpawu zeSpectral kunye neempawu zokumodareyitha: ISemiconductor isasaze iilaser zempendulo (DFB laser) baye baba ngumthombo wokukhanya obalulekileyo kunxibelelwano lwefiber optical kunye nonxibelelwano lwe-space optical ngenxa yeempawu zabo ezintle kakhulu kunye neempawu zokumodareyitha.
3. Iindleko kunye nokuveliswa kwemveliso: I-laser ye-semiconductor kufuneka ibe neenzuzo zeendleko eziphantsi kunye nokuveliswa kobuninzi ukuhlangabezana neemfuno zemveliso enkulu kunye nezicelo.
4. Ukusetyenziswa kwamandla kunye nokuthembeka: Kwiimeko zesicelo ezifana namaziko edatha, iilaser ze-semiconductor zifuna ukusetyenziswa kwamandla aphantsi kunye nokuthembeka okuphezulu kokuqinisekisa ukusebenza okuzinzile kwexesha elide.