Kugawa ndi kusintha kwa dongosolo la laser modulator

Kugawa ndi kusintha kwa dongosolo la laser modulator

Chowongolera cha laserndi mtundu wa zigawo zowongolera laser, sizili zosavuta monga makhiristo, magalasi ndi zigawo zina, komanso sizili zophatikizika kwambiri ngati ma laser,zida za laser, ndi kuchuluka kwa kuphatikiza, mitundu ndi ntchito za zinthu za gulu la chipangizo. Kuchokera ku mawonekedwe ovuta a mafunde a kuwala, zitha kuwoneka kuti zinthu zomwe zimakhudza mafunde a kuwala ndi mphamvu A(r), gawo Φ(r), pafupipafupi ω ndi mbali zinayi za njira yofalitsira, powongolera zinthuzi zimatha kusintha momwe mafunde a kuwala alili, modulator yogwirizana ya laser ndiyomodulator ya mphamvu, gawo modulator, frequency shifter ndi deflector.

1. Modulator ya mphamvu: imagwiritsidwa ntchito kusintha mphamvu kapena kukula kwa laser, yomwe ma attenuator optical, ma optical gets ndi omwe amayimira kwambiri, komanso zida ndi zida zophatikizika monga zogawa nthawi, zokhazikika mphamvu, ndi zochepetsera phokoso.

2. Gawo lowongolera: amagwiritsidwa ntchito polamulira gawo la beam, kuwonjezeka kwa gawo kumatchedwa lag, kuchepa kwa gawo kumatchedwa lead. Pali mitundu yambiri ya ma modulators a gawo, ndipo mfundo zawo zogwirira ntchito ndizosiyana kwambiri, monga ma modulators a photoelastic, ma modulators a LN high-speed electro-optical phase modulators, ma liquid crystal variable phase delay sheets, ndi zina zotero, zonsezi ndi ma modulators a gawo kutengera mfundo zosiyanasiyana zogwirira ntchito.

3. Chosinthira ma frequency: chimagwiritsidwa ntchito kusintha ma frequency a mafunde a kuwala, chimagwiritsidwa ntchito kwambiri mu makina apamwamba a laser kapena zida zamapu, ndi chosinthira ma frequency acousto-optical ngati choyimira wamba.

4. Deflector: imagwiritsidwa ntchito kusintha njira yofalitsira beam, njira yachikhalidwe ya galvanometer ndi imodzi mwa izo, kuwonjezera pa galvanometer ya mems yofulumira, deflector ya electro-optical ndi deflector ya acousto-optical.

Tili ndi lingaliro lalikulu la laser modulator, ndiko kuti, zigawo zomwe zimatha kuwongolera ndikusintha mawonekedwe ena a laser, koma tikufuna kuyambitsa kwathunthu zinthu zenizeni za laser modulator, nkhani imodzi yokha ndi yokwanira. Chifukwa chake, choyamba, yang'anani pa intensity modulator. Intensity modulator monga mtundu wa modulator yomwe imagwiritsidwa ntchito kwambiri mumitundu yonse yamakina owonera, mitundu yake, magwiridwe antchito osiyanasiyana amatha kufotokozedwa ngati ovuta, lero tikukupatsani njira zinayi zodziwika bwino za intensity modulator: mechanical scheme, electro-optic scheme, acousto-optic scheme ndi liquid crystal scheme.

1. Ndondomeko ya makina: makina oyendetsera mphamvu ya makina ndiye makina oyendetsera mphamvu oyamba komanso ogwiritsidwa ntchito kwambiri. Mfundo yake ndikusintha chiŵerengero cha kuwala kwa s ndi kuwala kwa p mu kuwala kozungulira pozungulira mbale ya theka la mafunde, ndikugawa kuwala ndi polarizer. Kuyambira kusintha koyamba kwa manja mpaka makina odziyimira okha komanso olondola kwambiri masiku ano, mitundu ya zinthu zake ndi chitukuko cha mapulogalamu ake zakhala zokhwima kwambiri.

2. Dongosolo la Electro-optical: electro-optical intensity modulator imatha kusintha mphamvu kapena kukula kwa kuwala kozungulira, mfundoyi imachokera ku Pockels effect ya makristalo a electro-optical. Mkhalidwe wa polarization wa kuwala kozungulira umasintha pambuyo poti electro-optic crystal yokhala ndi magetsi yagwiritsidwa ntchito, kenako polarization imagawidwa mosankha ndi polarizer. Mphamvu ya kuwala komwe kumatulutsa imatha kulamulidwa mwa kusintha mphamvu ya magetsi, ndipo m'mphepete mwa kukula kwa ns mungathe kufika.

3. Chiwembu cha Acousto-optic: acousto-optic modulator ingagwiritsidwenso ntchito ngati modulator ya mphamvu. Mwa kusintha mphamvu ya diffraction, mphamvu ya kuwala 0 ndi kuwala 1 zitha kulamulidwa kuti zikwaniritse cholinga chosintha mphamvu ya kuwala. Chipata cha Acoustooptic (optical attenuator) chili ndi mawonekedwe a liwiro la modulation mwachangu komanso malire owononga kwambiri.

4 Yankho la kristalo lamadzimadzi: Chipangizo cha kristalo lamadzimadzi nthawi zambiri chimagwiritsidwa ntchito ngati mbale yosinthira mafunde kapena fyuluta yosinthika, poyika magetsi oyendetsera mbali zonse ziwiri za bokosi la kristalo lamadzimadzi kuti liwonjezere chinthu cholondola cha polarization, chingapangidwe kukhala chotseka cha kristalo lamadzimadzi kapena chosinthira chosinthika, chinthucho chili ndi malo otseguka kwambiri kudzera mu kuwala, mawonekedwe odalirika kwambiri.