Njira ziwiri zogwirira ntchito za acousto-optic modulator

Njira ziwiri zogwirira ntchitomodulator ya acousto-optic
Chowongolera cha acousto-optic (AOM modulator) ndi chipangizo chomwe chingathe kusintha mphamvu kapena kupotoza ngodya ya kuwala kwa laser popanda kufunikira zigawo zilizonse zosuntha zazikulu. Mfundo yake yaikulu ndi yosavuta: kuyambitsa mafunde a mawu mu njira yowonekera, kugwiritsa ntchito kusintha kwa kachulukidwe komwe kumachitika chifukwa cha mafunde a mawu kuti apange cholumikizira cha diffraction, motero kusintha kuwala komwe kumadutsa.
1. Pambuyo polowa m'chigawo cha Prague, AOM modulator ili ndi ntchito ziwiri zofunika:
1.1 Kusinthasintha kwa mphamvu: kukonza ma frequency a RF ndikusintha mphamvu ya RF. Kusintha kwa mphamvu ya mawu kumabweretsa kusintha kwa kuya kwa grating, ndipo mphamvu ya kuwala koyambirira kumasintha moyenerera. Kusintha kwa mphamvu kosavuta ndi switch: RF ikayatsidwa, malo owala oyamba amawonekera; RF yazimitsidwa, malo owala oyamba amatha.
1.2 Kupotoza/kusanthula kwa denga: kusintha ma frequency a RF. Kusintha kwa ma frequency kumapangitsa kuti ma wavelength a mafunde a mawu asinthe, ndipo ma grating osasintha amasintha moyenerera, zomwe zimapangitsa kuti ngodya ya diffraction isinthe. Kuwala kwa laser kudzapotoza mkati mwa ngodya yaying'ono kwambiri. Kugwira ntchito munjira iyi nthawi zambiri kumafuna kuyitanitsa optical deflector (AOD).
Chofunika kwambiri cha acousto-optic modulator chingamveke ngati programmable diffraction grating, yomwe imagwiritsa ntchito ma radio frequency signals kuti ilamulire mafunde a ultrasonic, mafunde a ultrasonic kuti ilamulire magawo a grating, kenako ma grating kuti ilamulire mayendedwe ndi mphamvu ya laser. Ilibe magawo osuntha a macroscopic ndipo imatha kumaliza kusintha kwa kuwala, kuzimitsa, ndi kusanthula ngodya yaying'ono pa liwiro lalikulu kwambiri. Ngakhale kuti mtengo wake ndi wokwera ndipo kusiyana kwa deflection kuli kochepa, pakadali pano palibe njira ina yabwinoko yowongolera kuwala kwa ultra high speed.
Ubwino wa AOM modulator ndi liwiro lachangu, palibe kuwonongeka, komanso kulondola kwambiri, koma sinasinthe kwathunthu njira zamakanika. Chifukwa chake ndi cholunjika kwambiri: kapangidwe kake ndi kovuta, mtengo wake ndi wokwera, ngodya yopingasa ndi yaying'ono kwambiri, ndipo magwiridwe antchito onse ndi otsika kwambiri poyerekeza ndi makina monga magalasi ndi ma mota. Chifukwa chake, ngati liwiro silili lalikulu, kupingasa kwa makina nthawi zambiri kumakhala chisankho chabwino. Pokhapokha ngati liwiro la modulation lifika pa MHz kapena kupitirira apo ndipo kapangidwe ka makina sikangathe kupitirira, kangathe.zipangizo za acousto-optickukhala kosasinthika.