Modulator yeAcousto-optic: Kushandiswa mumakabati eatomu anotonhora
Sechinhu chikuru chekubatanidza kwelaser ye-fiber yese mukabati reatomu inotonhora, iyomodulator ye optical fiber acousto-opticichapa laser ine simba guru rema frequency-stabilized yekabati remaatomu anotonhora. Maatomu achatora ma photon ne resonant frequency ye v1. Sezvo simba rema photon nemaatomu rakasiyana, kumhanya kwemaatomu kuchaderera mushure mekutora ma photon, nokudaro zvichizadzisa chinangwa chekutonhodza maatomu. Maatomu anotonhodzwa ne laser, ane zvakanakira zvakaita senguva refu yekuongorora, kubvisa Doppler frequency shift uye frequency shift inokonzerwa nekukonana, uye kusabatana kwesimba rekuona chiedza, zvinovandudza zvakanyanya kugona kwakakodzera kwekuyera kweatomu spectra uye zvinogona kushandiswa zvakanyanya mumawachi eatomu anotonhora, ma interferometer eatomu anotonhora, uye cold atomic navigation, pakati pezvimwe zvinhu.
Mukati me optical fiber AOM acousto-optic modulator inonyanya kuve ne acousto-optic crystal uye optical fiber collimator, nezvimwewo. Chiratidzo chakagadziriswa chinoshanda pa piezoelectric transducer muchimiro che electrical signal (amplitude modulation, phase modulation kana frequency modulation). Nekuchinja maitiro ekupinda akadai se frequency uye amplitude ye input modulated signal, frequency uye amplitude modulation ye input laser zvinowanikwa. Piezoelectric transducer inoshandura ma electrical signals kuita ma ultrasonic signals anosiyana mu pattern imwechete nekuda kwe piezoelectric effect uye anoaparadzira mu acousto-optic medium. Mushure mekunge refractive index ye acousto-optic medium ichichinja nguva nenguva, refractive index grating inoumbwa. Kana laser inopfuura nepakati pe fiber collimator yopinda mu acousto-optic medium, diffraction inoitika. Frequency ye diffracted light inoisa ultrasonic frequency pane original input laser frequency. Gadzirisa nzvimbo ye optical fiber collimator kuti optical fiber acoust-optic modulator ishande zvakanaka. Panguva ino, Angle yechiedza chechiitiko inofanira kugutsa mamiriro eBragg diffraction, uye nzira ye diffraction inofanira kunge iri Bragg diffraction. Panguva ino, simba rese rechiedza chechiitiko rinotamisirwa kuchiedza che diffraction chekutanga.
Modulator yekutanga yeAOM acouto-optic inoshandiswa kumberi kwe optical amplifier yesystem, ichichinja chiedza chinopinda chinoenderera mberi kubva kumberi ne optical pulses. Modified optical pulses inobva yapinda mu optical amplification module yesystem kuti iwedzere simba. YechipiriAOM acouto-optic modulatorInoshandiswa kumagumo ekumashure kwe optical amplifier, uye basa rayo nderekuparadzanisa ruzha rwepasi rwe optical pulse signal inowedzerwa nesystem. Mipendero yekumberi neyekumashure ye light pulses inoburitswa neAOM acouto-optic modulator yekutanga inogoverwa zvakaenzana. Mushure mekupinda mu optical amplifier, nekuda kwekuti gain ye amplifier ye pulse leading edge yakakwira kupfuura iyo ye pulse trailing edge, amplified light pulses icharatidza waveform distortion phenomenon apo simba rinoiswa pa leading edge, sezvakaratidzwa muMufananidzo 3. Kuti system ikwanise kuwana optical pulses ine symmetrical distribution kumberi nekumashure, AOM acouto-optic modulator yekutanga inofanirwa kushandisa analog modulation. Iyo system control unit inogadzirisa rising edge yeAOM acouto-optic modulator yekutanga kuti iwedzere rising edge ye optical pulse ye acoust-optic module uye kutsiva gain non-uniformity ye optical amplifier kumberi nekumashure kwe pulse.
Optical amplifier yesystem haingowedzere chete masaini ekushanda kwe optical pulse, asiwo inowedzera ruzha rwekutanga rwe pulse sequence. Kuti uwane chiyero chepamusoro chesignal-to-noise system, chiyero chepamusoro che extinction ratio ye optical fiber.modulator yeAOMInoshandiswa kudzvinyirira ruzha rwebase kumucheto wekumashure kweamplifier, ichiva nechokwadi chekuti ma signal signal pulses esystem anogona kupfuura nepakati zvakanaka kusvika pamwero mukuru uku ichidzivirira ruzha rwebase kuti rusapinde mu time-domain acousto-optic shutter (time-domain pulse gate). Nzira ye digital modulation inoshandiswa, uye TTL level signal inoshandiswa kudzora on and off ye acoust-optic module kuona kuti rising edge ye time-domain pulse ye acoust-optic module ndiyo yakagadzirirwa rising time yechigadzirwa (kureva, nguva shoma yekukwira iyo chigadzirwa chinogona kuwana), uye pulse width inoenderana ne pulse width ye system TTL level signal.
Nguva yekutumira: Chikunguru-01-2025