Chowongolera cha Acousto-optic: Kugwiritsa ntchito m'makabati ozizira a atomu
Monga gawo lalikulu la ulalo wa laser wokhala ndi ulusi wonse mu kabati yozizira ya atomu,modulator ya kuwala kwa acousto-optic ya fiberipereka laser yamphamvu kwambiri yokhazikika pama frequency cabinet ya atomu yozizira. Maatomu adzayamwa ma photon ndi ma resonant frequency a v1. Popeza mphamvu ya ma photon ndi ma atomu ndi yosiyana, liwiro la ma atomu lidzachepa atatha kuyamwa ma photon, motero kukwaniritsa cholinga choziziritsira ma atomu. Maatomu ozizira ndi laser, omwe ali ndi ubwino wawo monga nthawi yayitali yofufuza, kuchotsa kusintha kwa ma frequency a Doppler ndi kusintha kwa ma frequency komwe kumachitika chifukwa cha kugundana, komanso kulumikizana kofooka kwa gawo la kuwala kozindikira, kumawonjezera kwambiri kuthekera koyezera kwa ma atomu ndipo kungagwiritsidwe ntchito kwambiri mu mawotchi ozizira a atomu, ma interferometer ozizira a atomu, ndi kuyenda kozizira kwa atomu, pakati pa madera ena.
Mkati mwa chosinthira kuwala cha AOM acousto-optic fiber makamaka chimakhala ndi kristalo wa acousto-optic ndi collimator ya fiber optical, ndi zina zotero. Chizindikiro chosinthidwa chimagwira ntchito pa chosinthira kuwala cha piezoelectric mu mawonekedwe a chizindikiro chamagetsi (kusinthasintha kwa amplitude, kusintha kwa gawo kapena kusintha kwa ma frequency). Mwa kusintha mawonekedwe olowera monga ma frequency ndi amplitude a chizindikiro chosinthidwa cholowetsedwa, kusintha kwa ma frequency ndi amplitude ya laser yolowetsedwa kumachitika. Chosinthira kuwala cha piezoelectric chimasintha ma signal amagetsi kukhala ma ultrasound omwe amasiyana mofanana chifukwa cha piezoelectric effect ndikufalitsa mu acousto-optic medium. Pambuyo poti refractive index ya acousto-optic medium isintha nthawi ndi nthawi, refractive index grating imapangidwa. Pamene laser imadutsa mu fiber collimator ndikulowa mu acousto-optic medium, diffraction imachitika. Ma frequency a diffracted light amaika ma ultrasound frequency pa ma frequency oyambira a laser yolowetsedwa. Sinthani malo a optical fiber collimator kuti optical fiber acoust-optic modulator igwire ntchito bwino kwambiri. Pa nthawiyi, ngodya ya kuwala kochitika iyenera kukwaniritsa mkhalidwe wa Bragg diffraction, ndipo njira yosinthira iyenera kukhala Bragg diffraction. Pa nthawiyi, mphamvu zonse za kuwala kochitika zimasamutsidwira ku kuwala kochitika koyamba.
Chosinthira magetsi choyamba cha AOM acouto-optic chimagwiritsidwa ntchito kutsogolo kwa amplifier ya makina, kusintha kuwala kolowera kosalekeza kuchokera kutsogolo ndi ma pulse optical. Ma pulse optical osinthidwa amalowa mu module ya makina optical amplification kuti awonjezere mphamvu. ChachiwiriAOM acouto-optic modulatorimagwiritsidwa ntchito kumapeto kwa optical amplifier, ndipo ntchito yake ndikupatula phokoso la maziko a chizindikiro cha optical pulse chomwe chimakulitsidwa ndi makina. Mphepete zakutsogolo ndi zakumbuyo za ma pulse otuluka ndi AOM acouto-optic modulator yoyamba zimagawidwa mofanana. Pambuyo polowa mu optical amplifier, chifukwa cha gain ya amplifier ya pulse leading edge kukhala yayikulu kuposa ya pulse trailing edge, ma amplified light pulses adzawonetsa vuto la waveform distortion pomwe mphamvu imayikidwa m'mphepete motsogozedwa, monga momwe zasonyezedwera pa Chithunzi 3. Kuti makina azitha kupeza ma optical pulses okhala ndi symmetrical distribution m'mphepete kutsogolo ndi kumbuyo, AOM acouto-optic modulator yoyamba iyenera kugwiritsa ntchito analog modulation. Gawo lowongolera dongosolo limakonza m'mphepete motsogozedwa wa AOM acouto-optic modulator yoyamba kuti iwonjezere m'mphepete motsogozedwa wa optical pulse wa acoust-optic module ndikubwezera kusagwirizana kwa optical amplifier m'mphepete kutsogolo ndi kumbuyo kwa pulse.
Chowonjezera kuwala cha dongosolo sichimangowonjezera zizindikiro zothandiza za kugunda kwa kuwala, komanso chimawonjezera phokoso loyambira la ndondomeko ya kugunda kwa mtima. Kuti tikwaniritse chiŵerengero chapamwamba cha chizindikiro-kwa-phokoso cha dongosolo, chiŵerengero chachikulu cha kutha kwa kuwala kwa kuwala chimawonekera.AOM modulatorimagwiritsidwa ntchito kuletsa phokoso la maziko kumbuyo kwa amplifier, kuonetsetsa kuti ma pulse a chizindikiro cha dongosolo amatha kudutsa bwino kwambiri pomwe akuletsa phokoso la maziko kulowa mu time-domain acousto-optic shutter (time-domain pulse gate). Njira yosinthira ya digito imagwiritsidwa ntchito, ndipo chizindikiro cha TTL level chimagwiritsidwa ntchito kuwongolera kuyatsa ndi kutseka kwa acoust-optic module kuti zitsimikizire kuti m'mphepete mwa kukwera kwa nthawi ya domain ya acoust-optic module ndiye nthawi yokwera yopangidwira ya chinthucho (mwachitsanzo, nthawi yocheperako yokwera yomwe chinthucho chingapeze), ndipo m'lifupi mwa kukwera kwa mtima kumadalira m'lifupi mwa kukwera kwa chizindikiro cha TTL level.
Nthawi yotumizira: Julayi-01-2025