"Polarization" ndi khalidwe lofala la ma laser osiyanasiyana, lomwe limatsimikiziridwa ndi mfundo yopangira laser.kuwala kwa laserimapangidwa ndi kuwala komwe kumayambitsidwa ndi tinthu tating'onoting'ono tomwe timatulutsa kuwala mkati mwalaser. Ma radiation oyambitsidwa ali ndi khalidwe lodabwitsa: pamene photon yakunja igunda tinthu tating'onoting'ono mu mkhalidwe wapamwamba wa mphamvu, tinthu tating'onoting'ono timatulutsa photon ndikusintha kukhala mkhalidwe wotsika wa mphamvu. Ma photon omwe amapangidwa mu njirayi ali ndi gawo lofanana, njira yofalitsira ndi mkhalidwe wofanana wa polarization monga ma photon akunja. Pamene mtsinje wa photon upangidwa mu laser, ma photon onse mu mode photon stream amagawana gawo lofanana, njira yofalitsira, ndi mkhalidwe wofanana wa polarization. Chifukwa chake, laser longitudinal mode (frequency) iyenera kugawidwa.
Si ma laser onse omwe ali ndi polarized. Mkhalidwe wa polarization wa laser umakhudzidwa ndi zinthu zingapo, kuphatikizapo:
1. Kuwunikira kwa resonator: Pofuna kuonetsetsa kuti ma photon ambiri akupezeka kuti apange kugwedezeka kokhazikika m'bowo ndikupangakuwala kwa laser, mbali yomaliza ya resonator nthawi zambiri imakutidwa ndi filimu yowunikira bwino. Malinga ndi lamulo la Fresnel, ntchito ya filimu yowunikira yokhala ndi zigawo zambiri imapangitsa kuti kuwala komaliza kowunikira kusinthe kuchoka ku kuwala kwachilengedwe kupita ku kuwala kolunjika.kuwala kozungulira.
2. Makhalidwe a njira yopezera mphamvu: kupanga laser kumadalira kuwala kolimbikitsidwa. Pamene maatomu olimbikitsidwa amatulutsa ma photon pansi pa kusonkhezera kwa ma photon akunja, ma photon awa amanjenjemera mbali imodzi (polarization state) monga ma photon akunja, zomwe zimathandiza kuti laser ikhalebe ndi polarization state yokhazikika komanso yapadera. Ngakhale kusintha kochepa mu polarization state kudzasefedwa ndi resonator chifukwa kugwedezeka kokhazikika sikungapangidwe.
Mu njira yeniyeni yopangira laser, mbale ya mafunde ndi kristalo ya polarization nthawi zambiri zimawonjezeredwa mkati mwa laser kuti zikonze mkhalidwe wokhazikika wa resonator, kotero kuti mkhalidwe wa polarization mu cavity ukhale wapadera. Izi sizimangopangitsa mphamvu ya laser kukhala yolimba kwambiri, komanso mphamvu yotulutsa imakhala yokwera, komanso zimapewa kutayika komwe kumachitika chifukwa cha kulephera kusinthasintha. Chifukwa chake, mkhalidwe wa polarization wa laser umadalira zinthu zambiri monga kapangidwe ka resonator, mtundu wa gain medium ndi mikhalidwe ya oscillation, ndipo nthawi zonse sizikhala zapadera.
Nthawi yotumizira: Juni-17-2024