Mfundo yogwira ntchito ya semiconductor laser

Ntchito mfundo yalaser semiconductor

Choyamba, zofunikira za parameter za semiconductor lasers zimayambitsidwa, makamaka kuphatikiza izi:
1. Mawonekedwe a Photoelectric: kuphatikizapo chiŵerengero cha kutha, kukula kwa mzere ndi zina, magawowa amakhudza mwachindunji ntchito ya semiconductor lasers mu machitidwe oyankhulana.
2. Zomangamanga: monga kukula kowala ndi makonzedwe, tanthauzo la mapeto a m'zigawo, kukula kwa unsembe ndi kukula kwa ndondomeko.
3. Wavelength: Kutalika kwa mafunde a laser semiconductor ndi 650 ~ 1650nm, ndipo kulondola ndikwapamwamba.
4. Threshold current (Ith) ndi ntchito panopa (lop) : Izi magawo amatsimikizira mikhalidwe yoyambira ndi momwe ntchito ya laser semiconductor.
5. Mphamvu ndi magetsi: Poyeza mphamvu, magetsi ndi magetsi a laser semiconductor pa ntchito, PV, PI ndi IV curves akhoza kukopeka kuti amvetse momwe amagwirira ntchito.

Mfundo yogwira ntchito
1. Kupeza zinthu: Kugawidwa kwa inversion kwa zonyamulira zonyamula mu lasing medium (gawo logwira ntchito) kumakhazikitsidwa. Mu semiconductor, mphamvu ya ma elekitironi amaimiridwa ndi mndandanda wa mphamvu pafupifupi mosalekeza. Choncho, chiwerengero cha ma elekitironi pansi pa gulu conduction mu mkulu mphamvu boma ayenera kukhala lalikulu kwambiri kuposa chiwerengero cha mabowo pamwamba pa gulu valence mu otsika mphamvu boma pakati pa zigawo ziwiri mphamvu gulu kukwaniritsa inversion wa. nambala ya particle. Izi zimatheka pogwiritsa ntchito kukondera kwa homojunction kapena heterojunction ndi jekeseni zonyamulira zofunika mu wosanjikiza yogwira kusangalatsa ma elekitironi kuchokera m'munsi mphamvu valence gulu kuti apamwamba mphamvu conduction gulu. Pamene chiwerengero chachikulu cha ma elekitironi mu m'mbuyo tinthu tinthu boma recoming ndi mabowo, analimbikitsa umuna kumachitika.
2. Kuti kwenikweni kupeza coherent analimbikitsa cheza, ndi analimbikitsa cheza ayenera kudyetsedwa kangapo mu kuwala resonator kupanga laser oscillation, ndi resonator wa laser aumbike ndi masoka cleavage pamwamba pa semiconductor galasi ngati galasi, kawirikawiri. atakulungidwa kumapeto kwa kuwala ndi high reflection multilayer dielectric film, ndi pamwamba yosalala yokutidwa ndi kuchepetsedwa kusinkhasinkha filimu. Kwa Fp cavity (Fabry-Perot cavity) semiconductor laser, FP patsekeke imatha kumangidwa mosavuta pogwiritsa ntchito ndege yachilengedwe yodutsana ndi ndege ya pn junction ya kristalo.
(3) Kuti apange oscillation okhazikika, sing'anga ya laser iyenera kupereka phindu lalikulu lokwanira kulipira kutayika kwa kuwala komwe kumayambitsidwa ndi resonator ndi kutayika komwe kumachitika chifukwa cha kutulutsa kwa laser kuchokera pamtunda, ndikuwonjezera nthawi zonse kuwala m'mphepete. Izi ziyenera kukhala ndi jakisoni wamphamvu wokwanira pano, ndiye kuti, pali kusinthika kwa tinthu kokwanira, kuchuluka kwa kutembenuka kwa tinthu tating'onoting'ono, kupindula kwakukulu, ndiko kuti, chofunikiracho chiyenera kukumana ndi zomwe zikuchitika pano. Laser ikafika pachimake, kuwala kokhala ndi kutalika kwake kumatha kulumikizidwanso pabowo ndikukulitsa, ndipo pamapeto pake kupanga laser ndi kutulutsa kosalekeza.

Zofunikira pakuchita
1. Kusinthasintha kwa bandwidth ndi mlingo: ma lasers a semiconductor ndi teknoloji yawo yosinthira ndizofunikira kwambiri pakulankhulana kopanda zingwe, ndipo kusinthasintha kwa bandwidth ndi mlingo zimakhudza mwachindunji khalidwe la kulankhulana. laser modulated mkati (mwachindunji modulated laser) ndi oyenera madera osiyanasiyana mu optical fiber communication chifukwa cha kufala kwake kothamanga komanso mtengo wotsika.
2. Mawonekedwe owoneka bwino ndi mawonekedwe osinthira: Semiconductor amagawa ma lasers (DFB laser) akhala gwero lowunikira lofunikira pakulumikizana kwa fiber optical ndi kulumikizana kwamlengalenga chifukwa cha mawonekedwe awo abwino kwambiri komanso mawonekedwe osinthira.
3. Mtengo ndi kupanga misala: Ma lasers a semiconductor ayenera kukhala ndi ubwino wa mtengo wotsika mtengo ndi kupanga misala kuti akwaniritse zofunikira za kupanga kwakukulu ndi ntchito.
4. Kugwiritsa ntchito mphamvu ndi kudalirika: Muzochitika zogwiritsira ntchito monga malo opangira deta, ma lasers a semiconductor amafuna mphamvu yochepa komanso kudalirika kwakukulu kuti atsimikizire kugwira ntchito kwa nthawi yaitali.