Acousto-optic modulator: Daim ntawv thov hauv cov khoom txias atom

Acousto-optic modulator: Daim ntawv thov hauv cov khoom txias atom

Raws li cov ntsiab lus tseem ceeb ntawm tag nrho-fiber laser txuas nyob rau hauv lub txias atom txee, lubOptical fiber ntau acousto-optic modulatoryuav muab high-power zaus-stabilized laser rau lub txias atom txee. Atoms yuav nqus tau photons nrog lub resonant zaus ntawm v1. Txij li thaum lub zog ntawm photons thiab atoms yog qhov sib txawv, qhov ceev ntawm atoms yuav txo qis tom qab nqus cov photons, yog li ua tiav lub hom phiaj ntawm cov atoms txias. Laser-txias atoms, nrog rau lawv cov zoo xws li ntev probing lub sij hawm, tshem tawm ntawm Doppler zaus hloov thiab zaus hloov los ntawm kev sib tsoo, thiab tsis muaj zog coupling ntawm lub nrhiav pom lub teeb teb, ho txhim kho lub meej ntsuas muaj peev xwm ntawm atomic spectra thiab tau dav siv nyob rau hauv txias atomic moos, txias atomic interferometer, thiab lwm yam.

Sab hauv ntawm ib qho khoom siv kho qhov muag AOM acousto-optic modulator feem ntau muaj cov acousto-optic siv lead ua thiab cov khoom siv kho qhov muag fiber ntau collimator, thiab lwm yam. Cov teeb liab modulated ua rau ntawm piezoelectric transducer nyob rau hauv daim ntawv ntawm hluav taws xob teeb liab (amplitude modulation, theem modulation los yog zaus modulation). Los ntawm kev hloov cov yam ntxwv input xws li zaus thiab amplitude ntawm input modulated teeb liab, zaus thiab amplitude modulation ntawm input laser yog tiav. Lub piezoelectric transducer converts hluav taws xob teeb liab mus rau hauv ultrasonic signals uas txawv nyob rau hauv tib lub qauv vim lub piezoelectric nyhuv thiab propagates lawv nyob rau hauv lub acousto-optic nruab nrab. Tom qab lub refractive index ntawm lub acousto-optic nruab nrab hloov ib ntus, ib tug refractive index grating yog tsim. Thaum lub laser hla los ntawm fiber ntau collimator thiab nkag mus rau hauv nruab nrab acousto-optic, diffraction tshwm sim. Qhov zaus ntawm lub teeb diffracted superimposes ib qho ultrasonic zaus ntawm tus thawj input laser zaus. Kho txoj hauj lwm ntawm optical fiber collimator kom lub optical fiber acoust-optic modulator ua hauj lwm nyob rau hauv lub xeev zoo tshaj plaws. Lub sijhawm no, qhov xwm txheej Lub kaum sab xis ntawm qhov teeb meem teeb pom kev zoo yuav tsum txaus siab rau Bragg diffraction mob, thiab hom diffraction yuav tsum yog Bragg diffraction. Lub sijhawm no, yuav luag tag nrho lub zog ntawm qhov teeb meem teeb pom kev zoo raug xa mus rau thawj qhov kev txiav txim diffraction teeb.

Thawj AOM acouto-optic modulator yog siv nyob rau hauv pem hauv ntej kawg ntawm lub kaw lus kho qhov muag amplifier, modulating lub nruam input lub teeb los ntawm pem hauv ntej kawg nrog optical pulses. Lub modulated optical pulses ces nkag mus rau hauv lub kaw lus optical amplification module rau lub zog amplification. Qhov thib obAOM acouto-optic modulatoryog siv tom qab kawg ntawm qhov kho qhov muag amplifier, thiab nws txoj haujlwm yog cais cov suab nrov ntawm cov teeb liab pulse optical amplified los ntawm lub system. Sab pem hauv ntej thiab sab nraub qaum ntawm lub teeb pulses tso zis los ntawm thawj AOM acouto-optic modulator yog symmetrically faib. Tom qab nkag mus rau hauv lub optical amplifier, vim qhov nce ntawm lub amplifier rau lub mem tes ua ntug yog siab dua li ntawd rau lub pulse trailing ntug, lub amplified lub teeb pulses yuav qhia ib tug waveform distortion phenomenon qhov twg lub zog yog concentrated nyob rau hauv cov ntug, raws li qhia nyob rau hauv daim duab 3. Yuav kom lub kaw lus kom tau optical pulses nrog rau pem hauv ntej-symmetrical faib OM. Modulator yuav tsum tau txais kev hloov kho analog. Lub kaw lus tswj tsev kho qhov nce ntawm ntug ntawm thawj AOM acouto-optic modulator kom nce ntug ntawm cov pulse optical ntawm lub acoust-optic module thiab them nyiaj rau qhov nce tsis sib xws ntawm optical amplifier nyob rau pem hauv ntej thiab nraub qaum ntawm cov mem tes.

Lub optical amplifier ntawm lub system tsis tsuas yog amplifies lub pab tau optical mem tes signals, tab sis kuj amplifies lub hauv paus suab nrov ntawm lub mem tes sib lawv liag. Txhawm rau kom ua tiav qhov system teeb liab-rau-suab nrov piv, lub siab extinction piv feature ntawm optical fiberAOM modulatoryog siv los suppress lub suab nrov nyob rau tom qab kawg ntawm lub amplifier, kom ntseeg tau tias lub kaw lus teeb liab pulses tuaj yeem dhau los ntawm qhov zoo tshaj plaws thaum tiv thaiv lub suab nrov los ntawm kev nkag mus rau lub sij hawm-domain acousto-optic shutter (time-domain pulse gate). Txoj kev hloov kho digital tau txais yuav, thiab TTL theem teeb liab yog siv los tswj lub rau thiab tawm ntawm acoust-optic module los xyuas kom meej tias qhov nce ntawm lub sij hawm-domain mem tes ntawm lub acoust-optic module yog tsim lub sij hawm nce ntawm cov khoom (piv txwv li, qhov tsawg tshaj plaws nce lub sij hawm uas cov khoom yuav tau txais), thiab cov mem tes dav nyob ntawm pulse dav ntawm qhov system TTL.