Umgaqo osebenzayo we-laser semiconductor

Umgaqo wokusebenza wesemiconductor laser

Okokuqala, iimfuno zeparamitha yee-laser ze-semiconductor 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 nokulungiswa, 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 luthotho lwamanqanaba aphantse aqhubekeka amandla. Ngoko ke, inani leelektroni ezisezantsi kwibhendi yokuqhuba kwimo ephezulu yamandla kufuneka ibe nkulu kakhulu kunenani lemingxunya engaphezulu kwebhanti ye-valence kwimo ephantsi yamandla phakathi kwemimandla emibini yebhendi yamandla ukufezekisa ukuguqulwa kwenani 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 ngumgangatho wendalo we-semiconductor crystal njengesibuko, ngokuqhelekileyo ifakwe ekupheleni kokukhanya kunye nefilimu ebonisa iplate encitshisiweyo, ifilimu ebonisa i-multilayer kunye ne-dielectric surface film. 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 output evela kumphezulu we-cavity, kunye nokwandisa rhoqo intsimi yokukhanya kwi-cavity. 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 ikhulise, 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 (imodyuli ngqo laser) ifanelekile kwiinkalo ezahlukeneyo kunxibelelwano lwefiber optical ngenxa yokuhanjiswa kwesantya 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.