Isimiso sokusebenza se-laser ye-semiconductor

Isimiso sokusebenzai-laser ye-semiconductor

Okokuqala, izidingo zepharamitha zama-laser e-semiconductor ziyaziswa, ikakhulukazi okuhlanganisa izici ezilandelayo:
1. Ukusebenza kwe-Photoelectric: kufaka phakathi isilinganiso sokuphela, ububanzi bomugqa obuguqukayo kanye neminye imingcele, le mingcele ithinta ngqo ukusebenza kwama-laser e-semiconductor ezinhlelweni zokuxhumana.
2. Amapharamitha esakhiwo: njengosayizi okhanyayo kanye nokuhleleka, incazelo yokuphela kokukhipha, usayizi wokufaka kanye nosayizi wohlaka.
3. Ubude be-Wavelength: Ububanzi be-wavelength ye-laser ye-semiconductor bungu-650 ~ 1650nm, futhi ukunemba kuphezulu.
4. Umugqa wamanje (Ith) kanye nomugqa wamanje osebenzayo (lop): Lawa mapharamitha anquma izimo zokuqala kanye nesimo sokusebenza se-laser ye-semiconductor.
5. Amandla kanye ne-voltage: Ngokulinganisa amandla, i-voltage kanye nogesi we-laser ye-semiconductor emsebenzini, ama-curve e-PV, PI kanye ne-IV angadonswa ukuze kuqondwe izici zawo zokusebenza.

Isimiso sokusebenza
1. Izimo zokuthola: Ukusatshalaliswa kokuguqulwa kwabathwali beshaja endaweni ephansi (isifunda esisebenzayo) kuyasungulwa. Ku-semiconductor, amandla ama-electron amelelwa uchungechunge lwamazinga wamandla acishe aqhubeke. Ngakho-ke, inani lama-electron phansi kwebhendi yokuqhuba amandla esimweni samandla aphezulu kumele libe likhulu kakhulu kunenani lemigodi ephezulu yebhendi ye-valence esimweni samandla aphansi phakathi kwezifunda ezimbili zebhendi yamandla ukuze kufezwe ukuguqulwa kwenombolo yezinhlayiya. Lokhu kufezwa ngokusebenzisa ukuthambekela okuhle ku-homojunction noma i-heterojunction kanye nokufaka abathwali abadingekayo kungqimba esebenzayo ukuze kushukunyiswe ama-electron kusuka ebhendini le-valence yamandla aphansi kuya ebhendini lokuqhuba amandla eliphezulu. Lapho inani elikhulu lama-electron esimweni sabantu bezinhlayiya ezibuyiselwe emuva lihlangana nezimbobo, ukukhishwa okushukunyisiwe kwenzeka.
2. Ukuze kutholakale imisebe evuselelwe ehambisanayo, imisebe evuselelwe kumele ibuyiselwe emuva izikhathi eziningana ku-resonator ye-optical ukuze kwakheke ukujikijeleka kwe-laser, i-resonator ye-laser yakhiwa ubuso bemvelo obuqhekekile bekristalu ye-semiconductor njengesibuko, ngokuvamile obumbozwe ekugcineni kokukhanya ngefilimu ye-dielectric ekhanyayo enezingqimba eziningi, futhi ubuso obubushelelezi bumbozwe ngefilimu ekhanyayo encishisiwe. Ku-laser ye-semiconductor ye-Fp cavity (Fabry-Perot cavity), i-FP cavity ingakhiwa kalula ngokusebenzisa indiza ye-natural cleavage eqondile endizeni ye-pn junction yekristalu.
(3) Ukuze kwakheke ukushukuma okuzinzile, i-laser medium kumele ikwazi ukunikeza inzuzo enkulu ngokwanele ukuze ikhokhele ukulahlekelwa okubonakalayo okubangelwa yi-resonator kanye nokulahlekelwa okubangelwa ukuphuma kwe-laser kusuka ebusweni be-cavity, futhi ikhulise njalo insimu yokukhanya emgodini. Lokhu kumele kube nomjovo wamanje onamandla ngokwanele, okungukuthi, kukhona ukuguqulwa kwenombolo yezinhlayiya okwanele, lapho izinga lokuguqulwa kwenombolo yezinhlayiya liphakeme, inzuzo iba nkulu, okungukuthi, isidingo kumele sihlangabezane nesimo esithile somkhawulo wamanje. Lapho i-laser ifika emkhawulweni, ukukhanya okunobude obuthile bokukhanya kungazwakala emgodini futhi kukhuliswe, futhi ekugcineni kwakheke i-laser kanye nomphumela oqhubekayo.

Imfuneko yokusebenza
1. I-bandwidth kanye nesilinganiso sokuguquguquka: ama-laser e-semiconductor kanye nobuchwepheshe bawo bokuguquguquka kubalulekile ekuxhumaneni okungenantambo kwe-optical, futhi i-bandwidth kanye nesilinganiso sokuguquguquka kuthinta ngqo ikhwalithi yokuxhumana. I-laser eguquliwe ngaphakathi (i-laser eguquliwe ngqo) ifanelekela izinkambu ezahlukene zokuxhumana ngefayibha ye-optical ngenxa yokudlulisela kwayo ngesivinini esikhulu kanye nezindleko eziphansi.
2. Izici ze-Spectral kanye nezici zokuguquguquka: Ama-laser empendulo esakazwa yi-semiconductor (I-laser ye-DFB) sezibe umthombo wokukhanya obalulekile ekuxhumaneni nge-optical fiber kanye nokuxhumana nge-space optical ngenxa yezici zazo ezinhle kakhulu ze-spectral kanye nezici zokuguquguquka.
3. Izindleko kanye nokukhiqizwa kwenqwaba: Ama-laser e-semiconductor kudingeka abe nezinzuzo zokukhiqizwa kwenqwaba okungabizi kakhulu ukuze kuhlangatshezwane nezidingo zokukhiqizwa okukhulu kanye nezicelo.
4. Ukusetshenziswa kwamandla nokuthembeka: Ezimweni zohlelo lokusebenza njengezikhungo zedatha, ama-laser e-semiconductor adinga ukusetshenziswa kwamandla okuphansi nokuthembeka okuphezulu ukuqinisekisa ukusebenza okuzinzile kwesikhathi eside.