Ka'idar aiki na semiconductor Laser

Ka'idar aiki nasemiconductor Laser

Da farko, an gabatar da buƙatun siga don laser semiconductor, galibi gami da abubuwan da suka biyo baya:
1. Photoelectric aiki: ciki har da ɓarna rabo, tsauri linewidth da sauran sigogi, wadannan sigogi kai tsaye tasiri na semiconductor Laser a cikin sadarwa tsarin.
2. Tsarin tsari: kamar girman haske da tsari, ma'anar hakar ƙarewa, girman shigarwa da girman zane.
3. Wavelength: Matsakaicin zangon laser semiconductor shine 650 ~ 1650nm, kuma daidaito yana da girma.
4. Ƙaddamarwa na yanzu (Ith) da kuma aiki na yanzu (lop): Waɗannan sigogi sun ƙayyade yanayin farawa da yanayin aiki na laser semiconductor.
5. Ƙarfin wutar lantarki: Ta hanyar auna wutar lantarki, ƙarfin lantarki da halin yanzu na laser semiconductor a wurin aiki, PV, PI da IV za a iya jawo su don fahimtar halayen aikin su.

Ƙa'idar aiki
1. Sami yanayi: An kafa rarraba rarraba cajin masu ɗaukar kaya a cikin lasing matsakaici (yanki mai aiki). A cikin semiconductor, ƙarfin lantarki yana wakilta da jerin matakan makamashi na kusan ci gaba. Saboda haka, adadin electrons a kasan band conduction a cikin babban makamashi jihar dole ne ya fi girma fiye da adadin ramukan a saman valence band a cikin low makamashi jihar tsakanin biyu makamashi band yankuna don cimma inversion na barbashi lamba. Ana samun wannan ta hanyar amfani da kyakyawan son rai ga homojunction ko heterojunction da allurar da suka dace a cikin Layer mai aiki don tada hankalin electrons daga ƙananan rukunin valence na makamashi zuwa mafi girman rukunin gudanarwar makamashi. Lokacin da babban adadin electrons a cikin juzu'in barbashi yawan jihar recombine da ramuka, kara kuzari ya auku.
2. Domin a zahiri samu coherent kara kuzari radiation, da kuzari radiation dole ne a ciyar da baya sau da yawa a cikin Tantancewar resonator don samar da Laser oscillation, da resonator na Laser aka kafa ta halitta cleavage surface na semiconductor crystal a matsayin madubi, yawanci plated a kan karshen haske tare da wani babban tunani multilayer dielectric fim, kuma tare da santsi rage cin abinci ne farantin. Don kogon Fp (Fabry-Perot cavity) Laser semiconductor, za a iya gina kogon FP cikin sauƙi ta hanyar amfani da jirgin saman tsagewar yanayi daidai da pn junction jirgin saman crystal.
(3) Domin samar da barga oscillation, da Laser matsakaici dole ne su iya samar da babban isa riba rama da Tantancewar asarar lalacewa ta hanyar resonator da asarar lalacewa ta hanyar Laser fitarwa daga kogon surface, da kuma kullum ƙara haske filin a cikin kogo. Wannan dole ne ya kasance yana da isasshen allura na yanzu, wato, akwai isassun juzu'i na lambar barbashi, girman girman juzu'in lambar barbashi, mafi girman riba, wato, buƙatun dole ne ya dace da wani yanayin kofa na yanzu. Lokacin da Laser ya isa bakin kofa, haske tare da takamaiman tsayin raƙuman raƙuman ruwa na iya sake kunnawa a cikin rami da haɓakawa, kuma a ƙarshe ya samar da laser da ci gaba da fitarwa.

Bukatar aiki
1. Modulation bandwidth da rate: semiconductor Laser da su modulation fasahar suna da muhimmanci a mara waya ta gani sadarwa, da kuma daidaita bandwidth da kudi kai tsaye shafi ingancin sadarwa. Laser modulated na ciki (kai tsaye modulated Laser) ya dace da fannoni daban-daban a cikin sadarwar fiber na gani saboda saurin watsawa da ƙarancin farashi.
2. Spectral halaye da daidaitawa halaye: Semiconductor rarraba ra'ayi lasers (Farashin DFB) sun zama tushen haske mai mahimmanci a cikin sadarwar fiber na gani da kuma sadarwar sararin samaniya saboda kyawawan halayen su da halayen haɓaka.
3. Cost da taro samarwa: Semiconductor Laser bukatar samun abũbuwan amfãni daga low cost da taro samar da saduwa da manyan sikelin samarwa da kuma aikace-aikace.
4. Amfani da wutar lantarki da aminci: A cikin yanayin aikace-aikacen kamar cibiyoyin bayanai, lasers na semiconductor yana buƙatar ƙarancin wutar lantarki da babban aminci don tabbatar da aiki mai tsayi na dogon lokaci.