Izinkambu zokusetshenziswa kwama-modulators e-acousto-optic (i-AOM Modulator)

Izinkambu zokusetshenziswa kwama-modulators e-acousto-optic (i-AOM Modulator)

Isimiso se-modulator ye-Acousto-optic:

An i-modulator ye-acousto-optic(i-AOM Modulator) ngokuvamile yakhiwa amakristalu e-acousto-optic, ama-transducer, amadivayisi okumunca kanye nabashayeli. Ukukhishwa kwesignali okuguquliwe okuvela kumshayeli kusebenza ku-transducer ngesimo sesignali kagesi bese kuguqulwa kube yigagasi le-ultrasonic elihlukahluka ngesimo sesignali kagesi. Lapho igagasi le-ultrasonic lidlula ku-acousto-optic medium, libangela ukucindezela kwendawo kanye nokwelulwa kwe-medium, okukhiqiza ukucindezeleka okunwebekayo. Lokhu kucindezeleka kushintsha njalo ngesikhathi nendawo, okwenza i-medium ibonise isenzakalo sokuguquguquka kobuningi, esifana ne-phase grating. Lapho ukukhanya kudlula kule medium kuphazanyiswa amagagasi e-ultrasonic, kwenzeka isenzakalo sokusabalalisa. Lesi simo sibizwa ngokuthi umphumela we-acousto-optic. Ngaphansi komphumela womsindo nokukhanya, isithwali se-optical siyaguquliwe futhi sibe yigagasi eliguquliwe "elithwala" ulwazi.

Izicelo eziyinhloko zama-modulators e-acousto-optic:

I-Sound and light Q Switch (AOQS)

Iswishi yokushintsha i-Q (AOQS) esebenza ngaphakathi kwe-laser cavity futhi ilungiswa ngenkuthalo

Inani le-Q emgodini lisetshenziselwa ukukhiqiza ama-laser aqhutshwayo anama-pulse amafushane namandla aphezulu. I-AOQS ivame ukusetshenziselwa ukulawula ukulahleka komsebe we-0-oda. Lapho umshayeli wemvamisa yomsakazo we-AOQS evuliwe, ukukhanya kwe-0-oda, ngenxa yokuphazamiseka, kuvimbela i-laser engaphakathi emgodini ukuthi ingashintshi, kwandisa ukulahleka komsebe futhi kuvimbele ukuphuma kwe-laser. Lapho umshayeli wemvamisa yomsakazo ecinyiwe isikhashana, amandla okukhanya aqongelelwe emgodini we-laser akhishwa ngesimo sama-pulse, ngaleyo ndlela akhiqize i-pulsed laser. Le nqubo ingaphindwa ngesivinini esingaphezu kwe-100KHz. Lapho i-AOQS isebenza esifundazweni saseBragg, kunomsebe owodwa kuphela we-diffraction.

Kunemisebe eminingi yokusabalalisa lapho kusebenza esifundazweni saseRaman-Niss.

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

Ama-modulators e-Acousto-optic (I-AOM) ngokuvamile zisetshenziswa ngaphandle kwe-laser cavity ukushintsha ubukhali be-incident laser (amplitude modulation AM). Lokhu kungaba i-ON/OFF modulation elula yokushintsha okusheshayo noma i-variable level modulation ukuze kufezwe i-intensity modulation. Imodi ye-modulation inqunywa uhlobo lomshayeli we-RF futhi ingaba yedijithali (ivuliwe/ivaliwe) noma i-analog (sine, square wave, linear, random…). Ngokuvamile, i-RF drive ye-AOM isebenzisa imvamisa ehleliwe. Ipharamitha eyinhloko yeI-AOM Modulatorisikhathi sokukhuphuka/sokuwa, esichaza “isivinini” noma i-bandwidth yokuguquguquka kwe-amplitude. Isikhathi sokukhuphuka/sokuwa silingana nobubanzi be-beam ngaphakathi kwe-modulator. Ngakho-ke, ukuze kutholakale isikhathi sokukhuphuka okusheshayo, ububanzi be-laser beam yesigameko kumele bulawulwe. I-AOM ingasetshenziswa njenge-shutter (ukuvula nokuvala nge-frequency ehleliwe) kanye ne-variable attenuator (elawula ngamandla ukuqina kokukhanya okudlulisiwe). Ukuguquguquka kwe-laser kufezwa ngokulawula imvamisa yomsakazo ukuze kubangele amaza omsindo ku-acousto-optic crystal.

3. I-Acousto-optic deflector (AODF)

I-acoutooptic deflector (AODF) ingafinyelela ukuskena kwe-excited beam ngokushintsha imvamisa yokushayela imvamisa yomsakazo. Indawo yokuskena ingaba yindawo engahleliwe, ukuskena komugqa oqhubekayo kanye nokuphambuka kwamaphuzu okulandelanayo. Ngokusekelwe ku-crystal, ubude be-wavelength kanye nosayizi we-beam, isikhathi sokuphendula sama-microsecond angu-0.05 kuya kwangu-15 kanye nokulawulwa kwesikhundla okunembile kwe-nRad kungafinyelelwa.

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

Ngemva kokudlula kuwo wonke amadivayisi e-acousto-optic, umsebe wokukhipha i-diffraction womsebe we-laser uzokhiqiza ukushintsha kwemvamisa. I-acousto-optic frequency shifter (AOFS) iyidivayisi encane eyenzelwe ngqo ukufeza ukushintsha kwemvamisa. Kuye ngama-engeli ahlukene akhethiwe esigameko, i-AOFS izoshintsha imvamisa iye phezulu noma yehle ngemvamisa yesignali yemvamisa yomsakazo esetshenzisiwe, futhi amadivayisi amabili noma ngaphezulu angahlukaniswa ukuze kufezwe inhlanganisela yemvamisa yesamba noma umehluko. Imikhiqizo ye-AOFS isebenzisa ama-engeli e-acoustic absorber aklanywe ngokukhethekile, anganciphisa ukubonakaliswa komsindo futhi athuthukise ukusebenza kahle kwe-AOFS.

5. Isihlungi Esilungisekayo Se-Acousto-optic (AOTF)

Isihlungi se-acousto-optic esilungisekayo (i-AOTF) siyi-solid-state, esiqondiswa ngogesi futhi esifinyelelwa ngokungahleliwe. Singasetshenziswa ukukhetha ngokushesha nangokuguquguqukayo ubude be-wavelength obuthile kusuka emithonjeni ye-broadband noma yemigqa eminingi. Ukwehluka kwenzeka lapho izimo ezithile zokufanisa zihlangatshezwana phakathi kwemisebe ye-acoustic. Ngakho-ke, kuba nokwenzeka ukulawula amapharamitha esihlungi ngogesi (njengobude be-wavelength, ukujula kokuguquguquka, kanye ne-bandwidth), ngaleyo ndlela kuhlinzeke ukufinyelela okusheshayo (ngokuvamile ama-microsecond), okuguquguqukayo, kanye nokungahleliwe ekuhlungeni okubonakalayo.