Iindawo zokusetyenziswa kwee-modulators ze-acousto-optic (i-AOM Modulator)

Iindawo zokusetyenziswa kwee-modulators ze-acousto-optic (i-AOM Modulator)

Umgaqo we-Acousto-optic modulator:

An i-modulator ye-acousto-optic(i-AOM Modulator) idla ngokwenziwa ziikristale ze-acousto-optic, ii-transducer, izixhobo zokufunxa kunye nabaqhubi. Ukuphuma kwesignali eguquliweyo evela kumqhubi kusebenza kwi-transducer ngendlela yesignali yombane kwaye emva koko kuguqulwa kube yi-ultrasound wave etshintshayo ngendlela yesignali yombane. Xa i-ultrasonic wave idlula kwi-acousto-optic medium, ibangela ucinezelo lwendawo kunye nokwandiswa kwe-medium, ivelise uxinzelelo lwe-elastic. Olu hlobo loxinzelelo lutshintsha rhoqo ngexesha nendawo, nto leyo ebangela ukuba i-medium ibonise utshintsho olutshintshanayo lwe-density, olufana ne-phase grating. Xa ukukhanya kudlula kule medium kuphazanyiswa ngamaza e-ultrasonic, kwenzeka into ye-diffraction. Le nto ibizwa ngokuba yi-acousto-optic effect. Phantsi kwesiphumo sesandi nokukhanya, i-optical carrier iyaguquguqulwa kwaye ibe yi-modified wave "ethwala" ulwazi.

Izicelo eziphambili zee-modulators ze-acousto-optic:

Isandi kunye nokukhanya kwe-Q Switch (AOQS)

Iswitshi yokutshintsha i-Q ye-acoutoop (AOQS) isebenza ngaphakathi kwe-laser cavity kwaye ilungiswa ngokusebenzayo

Ixabiso le-Q kwi-cavity lisetyenziselwa ukuvelisa ii-pulsed lasers ezine-pulses ezimfutshane kunye namandla aphezulu. I-AOQS idla ngokusetyenziselwa ukulawula ukulahleka kwe-0-order beam. Xa i-radio frequency driver ye-AOQS ivuliwe, ukukhanya kwe-0-order, ngenxa ye-diffraction, kuthintela i-laser kwi-cavity ukuba ingashukumi, inyuse ukulahleka kwe-cavity kwaye ithintele ukuphuma kwe-laser. Xa i-radio frequency driver icinyiwe okwethutyana, amandla e-optical aqokelelweyo kwi-laser cavity akhutshwa ngendlela ye-pulses, ngaloo ndlela ivelisa i-pulsed laser. Le nkqubo inokuphindwa ngesantya esingaphezulu kwe-100KHz. Xa i-AOQS isebenza kwi-Bragg state, kukho i-diffraction beam enye kuphela.

Kukho imisebe emininzi ye-diffraction xa usebenza kwiphondo laseRaman-Niss.

2. I-Acousto-optic Modulator/Switch (i-AOM Modulator)

Iimodulators ze-Acousto-optic (I-AOM) ngokubanzi zisetyenziswa ngaphandle kwe-laser cavity ukutshintsha i-intenency ye-incident laser (amplitude modulation AM). Oku kungaba yi-ON/OFF modulation elula yokutshintsha ngokukhawuleza okanye i-variable level modulation ukuze kufezekiswe i-intenensity modulation. I-modulation mode imiselwa luhlobo lwe-RF driver kwaye ingaba yi-digital (on/off) okanye i-analog (sine, square wave, linear, random…). Ngokubanzi, i-RF drive ye-AOM isebenzisa i-fixed frequency. I-key parameter yeI-AOM Modulatorlixesha lokunyuka/ukuwa, elichaza "isantya" okanye i-amplitude modulation bandwidth enokufikelelwa yokuguqulwa. Ixesha lokunyuka/ukuwa lilingana nobubanzi bemitha ngaphakathi kwe-modulator. Ke ngoko, ukuze kufunyanwe ixesha lokunyuka ngokukhawuleza, ububanzi be-incident laser beam kufuneka bulawulwe. I-AOM ingasetyenziswa njenge-shutter (ukuvula nokucima ngesantya esimiselweyo) kunye ne-variable attenuator (ukulawula ngamandla amandla okukhanya okudlulisiweyo). I-laser modulation ifezekiswa ngokulawula i-radio frequency ukubangela amaza esandi kwi-acousto-optic crystal.

3. Isixhobo sokunciphisa i-acousto-optic (AODF)

I-acoutooptic deflector (AODF) inokufikelela kwi-excited beam scanning ngokutshintsha i-radio frequency drive frequency. Indawo yokuskena ingaba yindawo engacwangciswanga, i-continuous line scanning kunye ne-sequential point deflection. Ngokusekelwe kwi-crystal, i-wavelength kunye nobukhulu be-beam, ixesha lokuphendula le-0.05 ukuya kwi-15 microseconds kunye nolawulo oluchanekileyo lwendawo ye-nRad lunokufezekiswa.

4. I-Acousto-optic frequency Shifter (AOFS)

Emva kokudlula kuzo zonke izixhobo ze-acousto-optic, umqadi wokukhupha i-diffraction we-laser beam uya kuvelisa i-frequency shift. I-acousto-optic frequency shifter (AOFS) sisixhobo esincinci esenzelwe ngokukodwa ukufezekisa i-frequency shifting. Ngokuxhomekeke kwii-engile ezahlukeneyo zesiganeko ezikhethiweyo, i-AOFS iya kutshintsha i-frequency inyuke okanye ihle nge-frequency yesignali yerediyo esetyenzisiweyo, kwaye izixhobo ezibini okanye ngaphezulu zinokuhlulwa ukuze kufezekiswe i-sum okanye difference frequency combinations. Iimveliso ze-AOFS zisebenzisa ii-engile ze-acoustic absorber ezenzelwe ngokukodwa, ezinokunciphisa i-sound reflection kwaye ziphucule ukusebenza kakuhle kwe-AOFS.

5. Isihluzi esiLungisekayo se-Acousto-optic (AOTF)

Isihluzo se-acousto-optic tunable filter (AOTF) sisihluzo se-optical passband esiqinileyo, esijongwe nge-elektroniki kwaye sifikeleleka ngokungacwangciswanga. Singasetyenziselwa ukukhetha ngokukhawuleza nangokutshintshatshintshayo ii-wavelengths ezithile kwimithombo ye-broadband okanye yemigca emininzi. Ukwahlukana kwenzeka xa iimeko ezithile zokufanisa zihlangatyezwana phakathi kwe-acoustic beams. Ke ngoko, kuba nokwenzeka ukulawula iiparameter zesihluzo nge-elektroniki (ezifana ne-wavelength, ubunzulu be-modulation, kunye ne-bandwidth), ngaloo ndlela kubonelela ngokukhawuleza (ngesiqhelo i-microseconds), i-dynamic, kunye nokufikelela ngokungacwangciswanga kwi-optical filtering.