Acousto-optic modulator: Kugwiritsa ntchito makabati ozizira a atomu

Acousto-optic modulator: Kugwiritsa ntchito mu makabati ozizira a atomu

Monga gawo lalikulu la ulalo wa laser-fiber mu kabati ya atomu yozizira, theOptical fiber acousto-optic modulatoradzapereka mphamvu yamphamvu pafupipafupi-yokhazikika laser kwa ozizira atomu nduna. Ma atomu amayamwa ma photon okhala ndi ma frequency a resonant a v1. Popeza mphamvu ya ma photon ndi ma atomu ndi yosiyana, liwiro la ma atomu lidzachepa pambuyo poyamwa mafotoni, potero kukwaniritsa cholinga cha maatomu ozizira. Laser-utakhazikika maatomu, ndi ubwino wake monga nthawi yaitali kufufuza, kuchotsa Doppler pafupipafupi kusuntha ndi kusuntha pafupipafupi chifukwa kugunda, ndi ofooka lumikiza wa kudziwika kuwala munda, bwino kwambiri muyeso yeniyeni mphamvu ya sipekitiramu atomiki ndipo angagwiritsidwe ntchito mofala mu ozizira mawotchi atomiki, ozizira atomiki interferometers, ndi kuzizira kumadera ena atomu navigation.

Mkati mwa kuwala kwa fiber AOM acousto-optic modulator makamaka imakhala ndi acousto-optic crystal ndi optical fiber collimator, ndi zina zotero. Mwa kusintha athandizira makhalidwe monga pafupipafupi ndi matalikidwe a athandizira modulated siginecha, pafupipafupi ndi matalikidwe kusinthasintha kwa laser athandizira zimatheka. Transducer ya piezoelectric imasintha ma siginecha amagetsi kukhala ma ultrasonic sign omwe amasiyana munjira yomweyo chifukwa cha mphamvu ya piezoelectric ndikumafalitsa mu acousto-optic medium. Pambuyo pakusintha kwa refractive index of acousto-optic sing'anga nthawi ndi nthawi, refractive index grating imapangidwa. Pamene laser imadutsa mu fiber collimator ndikulowa mu acousto-optic sing'anga, diffraction imachitika. Mafupipafupi a diffracted kuwala superimpose ndi akupanga pafupipafupi pa choyambirira athandizira laser pafupipafupi. Sinthani malo a optical fiber collimator kuti optical fiber acoust-optic modulator igwire ntchito bwino kwambiri. Panthawiyi, Ngongole ya chochitikacho iyenera kukwaniritsa mawonekedwe a Bragg diffraction, ndipo diffraction mode iyenera kukhala Bragg diffraction. Panthawiyi, pafupifupi mphamvu zonse za kuwala kwa chochitikacho zimasamutsidwa ku kuwala koyambira koyamba.

Woyamba wa AOM acouto-optic modulator amagwiritsidwa ntchito kumapeto kwa makina amplifier opangira makina, kusinthira kuwala kopitilira kutsogolo kuchokera kumapeto ndi ma pulses owoneka. Ma modulated optical pulses ndiye amalowetsa gawo la optical amplification la system kuti likulitse mphamvu. ChachiwiriAOM acouto-optic modulatorimagwiritsidwa ntchito kumapeto kwa amplifier optical, ndipo ntchito yake ndikulekanitsa phokoso lapansi la chizindikiro cha optical pulse chokulitsidwa ndi dongosolo. Mphepete zakutsogolo ndi zakumbuyo za ma pulses owunikira omwe amapangidwa ndi AOM acouto-optic modulator yoyamba amagawidwa molingana. Pambuyo polowa mu amplifier optical, chifukwa cha kupindula kwa amplifier kwa pulse kutsogolera m'mphepete kukhala wapamwamba kusiyana ndi pulse trailing m'mphepete, kuwala kowonjezereka kumawonetsa zochitika zowonongeka za waveform pamene mphamvu imayikidwa pamphepete mwa kutsogolera, monga momwe tawonetsera pa Chithunzi 3. Kuti dongosololi lipeze mawotchi opsymmetric kutsogolo ndi kumbuyo kwa AOM pulses kutsogolo ndi kumbuyo kwa AOM pulse ma acouto-optic modulator amayenera kutengera kusintha kwa analogi. Dongosolo loyang'anira kachitidwe kameneka limasintha kukwera kwa gawo loyamba la AOM acouto-optic modulator kuti liwonjeze kukwera m'mphepete mwa kugunda kwa ma acoust-optic module ndikulipiritsa kupindula kosafanana kwa amplifier optical kutsogolo ndi kumbuyo m'mphepete mwa kugunda.

Optical amplifier of the system sikuti amangokulitsa ma signature optical pulse, komanso amakulitsa phokoso loyambira la pulse sequence. Kuti mukwaniritse chiŵerengero chapamwamba cha signal-to-phokoso, chiŵerengero chapamwamba cha kutha kwa kuwala kwa fiberAOM moduleimagwiritsidwa ntchito kupondereza phokoso lakumbuyo kwa amplifier, kuwonetsetsa kuti ma pompopompo azizindikiro amatha kudutsa bwino kwambiri ndikuletsa phokoso loyambira kuti lisalowe pachitseko cha nthawi-domain acousto-optic shutter (time-domain pulse gate). Njira yosinthira digito imatengedwa, ndipo siginecha ya mulingo wa TTL imagwiritsidwa ntchito kuwongolera kutulutsa ndi kutuluka kwa gawo la acoust-optic kuwonetsetsa kuti kukwera m'mphepete kwa gawo la nthawi ya gawo la acoust-optic module ndi nthawi yokwera ya chinthucho (ie, nthawi yocheperako yomwe chinthucho chingapeze), ndipo m'lifupi mwake kumatengera kuchuluka kwa mawonekedwe amtundu wa TTL.