Magawo ogwiritsira ntchito ma modulators a acousto-optic (AOM Modulator)

Magawo ogwiritsira ntchito ma modulators a acousto-optic (AOM Modulator)

Mfundo yaikulu ya modulator ya Acousto-optic:

An modulator ya acousto-optic(AOM Modulator) nthawi zambiri imakhala ndi makhiristo a acousto-optic, ma transducer, zida zoyamwitsa ndi ma driver. Chizindikiro chosinthidwa kuchokera ku dalaivala chimagwira ntchito pa transducer mu mawonekedwe a chizindikiro chamagetsi kenako chimasanduka mafunde a ultrasonic omwe amasinthasintha mu mawonekedwe a chizindikiro chamagetsi. Pamene mafunde a ultrasonic amadutsa mu acousto-optic medium, amachititsa kuti cholumikiziracho chikhale cholimba komanso chotalikirapo, zomwe zimapangitsa kuti cholumikiziracho chikhale ndi vuto losinthasintha, lofanana ndi phase grating. Pamene kuwala kumadutsa mu cholumikizirachi chosokonezedwa ndi mafunde a ultrasonic, pamakhala vuto la diffraction. Vutoli limatchedwa acousto-optic effect. Pansi pa mphamvu ya mawu ndi kuwala, chonyamulira cha optical chimasinthidwa ndipo chimakhala mafunde osinthidwa omwe "amanyamula" chidziwitso.

Ntchito zazikulu za ma modulators a acousto-optic:

Chosinthira cha Q (AOQS) cha Phokoso ndi Kuwala

Chosinthira cha acoutoop Q (AOQS) chimagwira ntchito mkati mwa laser cavity ndipo chimasinthidwa mwachangu

Mtengo wa Q mu cavity umagwiritsidwa ntchito popanga ma laser oyendetsedwa ndi ma pulse afupi komanso mphamvu yayikulu. AOQS nthawi zambiri imagwiritsidwa ntchito kusintha kutayika kwa kuwala kwa 0-order. Pamene choyendetsa ma radio frequency cha AOQS chayatsidwa, kuwala kwa 0-order, chifukwa cha diffraction, kumalepheretsa laser mu cavity kuti isasunthike, ndikuwonjezera kutayika kwa cavity ndikuletsa kutulutsa kwa laser. Pamene choyendetsa ma radio frequency chazimitsidwa kwakanthawi, mphamvu yowunikira yomwe yasonkhanitsidwa mu cavity ya laser imatulutsidwa mu mawonekedwe a ma pulse, motero imapanga pulsed laser. Njirayi ikhoza kubwerezedwa pa liwiro loposa 100KHz. Pamene AOQS ikugwira ntchito mu Bragg state, pali diffraction beam imodzi yokha.

Pali ma diffraction beams angapo pamene akugwira ntchito ku Raman - Niss state.

2. Chosinthira/Chosinthira cha Acousto-optic (AOM Modulator)

Ma modulators a acousto-optic (AOM) nthawi zambiri amagwiritsidwa ntchito kunja kwa laser cavity kusintha mphamvu ya incident laser (amplitude modulation AM). Iyi ikhoza kukhala ON/OFF modulation yosavuta yosinthira mwachangu kapena variable level modulation kuti ikwaniritse intensity modulation. Modulation mode imatsimikiziridwa ndi mtundu wa RF driver ndipo ikhoza kukhala ya digito (on/off) kapena analog (sine, square wave, linear, random…). Kawirikawiri, RF drive ya AOM imagwiritsa ntchito frequency yokhazikika. Gawo lofunika laAOM ModulatorNdi nthawi yokwera/kugwa, yomwe imafotokoza "liwiro" lomwe lingatheke kapena kuchuluka kwa ma modulation. Nthawi yokwera/kugwa imagwirizana ndi kukula kwa beam mkati mwa modulator. Chifukwa chake, kuti mupeze nthawi yokwera mwachangu, kukula kwa beam ya laser yochitika kuyenera kulamulidwa. AOM ingagwiritsidwe ntchito ngati shutter (kuyendetsa ndi kuzima pafupipafupi) komanso ngati chochepetsera mphamvu ya kuwala kotumizidwa. Kusinthasintha kwa laser kumachitika powongolera ma frequency a wailesi kuti apangitse mafunde amawu mu acousto-optic crystal.

3. Cholepheretsa ma acousto-optic (AODF)

Chotsukira cha acoutooptic (AODF) chimatha kupanga scan yosangalatsa ya beam posintha ma frequency drive frequency. Malo osanthula akhoza kukhala malo osasinthika, kusanthula mzere mosalekeza komanso kusokoneza mfundo motsatizana. Kutengera ndi kristalo, kutalika kwa mafunde ndi kukula kwa beam, nthawi yoyankha ya 0.05 mpaka 15 microseconds ndi kuwongolera bwino malo a nRad zitha kuchitika.

4. Chisinthiko cha pafupipafupi cha Acousto-optic (AOFS)

Pambuyo podutsa mu zipangizo zonse za acousto-optic, kuwala kotulutsa kuwala kwa laser kudzapanga kusintha kwa ma frequency. Chosinthira ma frequency cha acousto-optic (AOFS) ndi chipangizo chopangidwa mwapadera kuti chisinthe ma frequency. Kutengera ma angles osiyanasiyana osankhidwa, AOFS idzasuntha ma frequency mmwamba kapena pansi potengera ma frequency a radio frequency signal, ndipo zipangizo ziwiri kapena zingapo zitha kusinthidwa kuti zigwirizane ndi ma frequency okwana kapena osiyana. Zogulitsa za AOFS zimagwiritsa ntchito ma angles opangidwa mwapadera a acoustic absorber, omwe angachepetse kuwunikira kwa mawu ndikuwonjezera magwiridwe antchito a AOFS.

5. Chosefera Chosinthika cha Acousto-optic (AOTF)

Fyuluta yosinthika ya acousto-optic (AOTF) ndi fyuluta yosinthika, yolumikizidwa pakompyuta komanso yofikira mwachisawawa. Itha kugwiritsidwa ntchito kusankha mwachangu komanso mosinthasintha ma wavelength enaake kuchokera ku magwero a broadband kapena magwero a mizere yambiri. Kusinthasintha kumachitika pamene zinthu zinazake zofanana zakwaniritsidwa pakati pa ma acoustic beams. Chifukwa chake, zimakhala zotheka kuwongolera magawo a fyuluta pakompyuta (monga wavelength, modulation depth, komanso bandwidth), motero imapereka mwayi wofulumira (nthawi zambiri microseconds), dynamic, komanso mwachisawawa wofikira ku optical filtering.