Kev faib tawm thiab kev hloov kho ntawm laser modulator

Kev faib tawm thiab kev hloov kho ntawm laser modulator

Lub tshuab hloov kho laseryog ib hom kev tswj hwm laser Cheebtsam, nws tsis yog qhov yooj yim li cov siv lead ua, lens thiab lwm yam khoom, thiab tsis yog kev sib xyaw ua ke zoo li lasers,cov khoom siv laser, yog qib siab ntawm kev koom ua ke, hom thiab kev ua haujlwm ntawm cov khoom siv hauv chav kawm. Los ntawm qhov kev qhia nyuaj ntawm lub teeb nthwv dej, nws tuaj yeem pom tias cov yam tseem ceeb cuam tshuam rau lub teeb nthwv dej yog qhov muaj zog A (r), theem Φ (r), zaus ω thiab plaub yam ntawm kev taw qhia kev nthuav dav, los ntawm kev tswj cov yam no tuaj yeem hloov pauv lub xeev ntawm lub teeb nthwv dej, lub laser modulator sib xws yoglub zog modulator, theem modulator, zaus shifter thiab deflector.

1. Intensity modulator: siv los hloov qhov muaj zog lossis qhov loj ntawm lub laser, uas cov attenuators optical, optical gates yog cov sawv cev tshaj plaws, nrog rau cov khoom siv thiab cov khoom siv sib xyaw xws li lub sijhawm faib, lub zog stabilizers, suab nrov attenuators.

2. Theem modulator: siv los tswj cov theem ntawm lub beam, qhov nce theem hu ua lag, qhov txo qis theem hu ua lead. Muaj ntau hom theem modulators, thiab lawv cov hauv paus ntsiab lus ua haujlwm sib txawv heev, xws li photoelastic modulators, LN high-speed electro-optical theem modulators, kua siv lead ua kua hloov pauv theem qeeb, thiab lwm yam, yog txhua theem modulators raws li cov hauv paus ntsiab lus ua haujlwm sib txawv.

3. Zaus hloov pauv: siv los hloov zaus ntawm lub teeb nthwv dej, siv dav hauv cov tshuab laser siab lossis cov khoom siv mapping, nrog rau acousto-optical zaus hloov pauv ua tus sawv cev ib txwm muaj.

4. Deflector: siv los hloov qhov kev taw qhia ntawm lub teeb kis mus, lub kaw lus galvanometer ib txwm muaj yog ib qho ntawm lawv, ntxiv rau cov mems galvanometer sai dua, electro-optical deflector thiab acousto-optical deflector.

Peb muaj lub tswv yim dav dav ntawm lub laser modulator, uas yog, cov khoom uas tuaj yeem tswj hwm thiab hloov pauv qee yam khoom ntawm lub laser, tab sis xav qhia tag nrho cov khoom tshwj xeeb ntawm lub laser modulator, tsuas yog ib tsab xov xwm tsis txaus. Yog li, ua ntej tshaj plaws, tsom mus rau qhov modulator zog. Intensity modulator ua ib hom modulator siv dav hauv txhua hom optical systems, nws ntau yam, qhov kev ua tau zoo sib txawv tuaj yeem piav qhia tias nyuaj, hnub no los qhia koj plaub qhov kev siv zog modulator: mechanical scheme, electro-optic scheme, acousto-optic scheme thiab kua siv lead ua kua.

1. Txoj kev npaj kho tshuab: lub zog kho tshuab modulator yog qhov pib thiab siv dav tshaj plaws. Lub hauv paus ntsiab lus yog hloov qhov sib piv ntawm s lub teeb thiab p lub teeb hauv lub teeb polarized los ntawm kev tig lub phaj ib nrab nthwv dej, thiab faib lub teeb los ntawm polarizer. Txij li thaum pib kho phau ntawv mus rau niaj hnub no qhov kev siv tshuab siab thiab siab, nws cov khoom lag luam thiab kev txhim kho daim ntawv thov tau paub tab heev.

2. Txoj kev npaj electro-optical: electro-optical intensity modulator tuaj yeem hloov qhov intensity lossis amplitude ntawm polarized light, lub hauv paus ntsiab lus yog raws li Pockels effect ntawm electro-optical crystals. Lub xeev polarization ntawm polarized beam hloov tom qab electro-optic crystal nrog lub teb hluav taws xob tau siv, thiab tom qab ntawd polarization yog xaiv faib los ntawm polarizer. Qhov intensity ntawm lub teeb emitted tuaj yeem tswj tau los ntawm kev hloov qhov intensity ntawm lub teb hluav taws xob, thiab qhov nce / poob ntug ntawm ns magnitude tuaj yeem ncav cuag.

3. Txoj kev npaj Acousto-optic: acousto-optic modulator kuj tseem siv tau ua lub zog modulator. Los ntawm kev hloov pauv qhov ua tau zoo ntawm diffraction, lub zog ntawm 0 lub teeb thiab 1 lub teeb tuaj yeem tswj tau kom ua tiav lub hom phiaj ntawm kev kho qhov muaj zog ntawm lub teeb. Acoustooptic rooj vag (optical attenuator) muaj cov yam ntxwv ntawm kev hloov kho ceev ceev thiab qhov ua rau puas tsuaj siab.

4 Cov kua siv lead ua kua: cov khoom siv siv lead ua kua feem ntau siv ua lub phaj nthwv dej lossis cov lim dej tunable, los ntawm kev siv lub zog tsav ntawm ob qho kawg ntawm lub thawv siv lead ua kua kom ntxiv cov khoom polarization precision, tuaj yeem ua rau hauv lub qhov kaw siv lead ua kua lossis lub attenuator hloov pauv, cov khoom muaj lub qhov loj los ntawm lub teeb, cov yam ntxwv kev ntseeg siab siab.