Chiyambi cha laser ya semiconductor yozungulira pamwamba pa cavity (VCSEL)

Chiyambi cha kusuntha kwa pamwamba pa dzenje loyimalaser ya semiconductor(VCSEL)
Ma laser otulutsa zinthu pamwamba pa nthaka ozungulira (vertical external cavity) adapangidwa pakati pa zaka za m'ma 1990 kuti athetse vuto lalikulu lomwe lakhala likuvutitsa chitukuko cha ma laser achikhalidwe a semiconductor: momwe angapangire ma laser amphamvu kwambiri okhala ndi kuwala kwapamwamba munjira yoyambira yopingasa.
Ma laser otulutsa zinthu pamwamba pa nthaka omwe ali ndi mawonekedwe ozungulira (Vecsels), omwe amadziwikanso kutima laser a semiconductor disc(SDL), ndi membala watsopano wa banja la laser. Imatha kupanga kutalika kwa mafunde otulutsa mpweya mwa kusintha kapangidwe ka zinthu ndi makulidwe a chitsime cha quantum mu semiconductor gain medium, ndipo kuphatikiza ndi intracavity frequency doubling kumatha kuphimba kutalika kwa mafunde osiyanasiyana kuyambira pa ultraviolet mpaka ku infrared, kukwaniritsa kutulutsa kwamphamvu kwambiri pomwe ikusunga kuwala kozungulira kwa Angle symmetric laser beam. Laser resonator imapangidwa ndi kapangidwe ka DBR pansi pa gain chip ndi galasi lolumikizira lakunja. Kapangidwe kapadera ka resonator yakunja kameneka kamalola zinthu zowala kuyikidwa m'chimbudzi kuti zigwiritsidwe ntchito monga frequency doubling, kusiyana kwa ma frequency, ndi mode-locking, zomwe zimapangitsa VECSEL kukhala yabwino kwambiri.gwero la laserkugwiritsa ntchito kuyambira biophotonics, spectroscopy,mankhwala a laser, ndi kuwonetsera kwa laser.
Chowunikira cha laser ya semiconductor yotulutsa kuwala ya VC-surface chili molunjika ku ndege komwe kuli dera logwira ntchito, ndipo kuwala kwake kotulutsa kuwala kuli molunjika ku ndege ya dera logwira ntchito, monga momwe zasonyezedwera pachithunzichi.VCSEL ili ndi ubwino wapadera, monga kukula kochepa, kuchuluka kwa ma frequency ambiri, khalidwe labwino la kuwala, malire akuluakulu a kuwonongeka kwa pamwamba, komanso njira yosavuta yopangira. Ikuwonetsa magwiridwe antchito abwino kwambiri pakugwiritsa ntchito chiwonetsero cha laser, kulumikizana kwa kuwala ndi wotchi yowunikira. Komabe, ma VCsel sangathe kupeza ma laser amphamvu kwambiri kuposa mulingo wa watt, kotero sangagwiritsidwe ntchito m'minda yomwe ikufunika mphamvu zambiri.

Chowunikira cha laser cha VCSEL chimapangidwa ndi chowunikira cha Bragg chogawidwa (DBR) chopangidwa ndi kapangidwe ka epitaxial ka multi-layer ka zinthu za semiconductor mbali zonse ziwiri zakumtunda ndi pansi pa dera logwira ntchito, zomwe ndi zosiyana kwambiri ndilaserresonator yopangidwa ndi cleavage plane mu EEL. Mayendedwe a VCSEL optical resonator ndi olunjika pamwamba pa chip, kutulutsa kwa laser nakonso kolunjika pamwamba pa chip, ndipo kuwunikira kwa mbali zonse ziwiri za DBR ndikokwera kwambiri kuposa kwa EEL solution plane.
Kutalika kwa laser resonator ya VCSEL nthawi zambiri kumakhala ma microns ochepa, omwe ndi ochepa kwambiri kuposa a millimeter resonator ya EEL, ndipo njira imodzi yopezera kudzera mu optical field oscillation mu cavity ndi yotsika. Ngakhale kuti transverse mode output core ingapezeke, mphamvu yotulutsa imatha kufika ma milliwatts angapo okha. Mbiri ya cross-section ya VCSEL output laser beam ndi yozungulira, ndipo divergence Angle ndi yaying'ono kwambiri kuposa ya m'mphepete mwa laser emitting beam. Kuti mupeze mphamvu yayikulu yotulutsa VCSEL, ndikofunikira kuwonjezera dera lowala kuti lipereke phindu lalikulu, ndipo kuwonjezeka kwa dera lowala kudzapangitsa kuti laser yotulutsa ikhale yotulutsa ma multi-mode. Nthawi yomweyo, zimakhala zovuta kupeza uniform current injection mu dera lalikulu lowala, ndipo equal current injection idzakulitsa kuchulukana kwa kutentha. Mwachidule, VCSEL imatha kutulutsa malo ozungulira ozungulira kudzera mu kapangidwe koyenera, koma mphamvu yotulutsa imakhala yochepa pamene output ndi single mode. Chifukwa chake, ma VCsel ambiri nthawi zambiri amaphatikizidwa mu output mode.