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FreeSpaceIsolators

时间:2020-01-08作者:uedbet官网手机版已浏览: 137次

uedbet官网手机版CASTECH'sFreeSpaceIsolatorscouldmaintainthelight'slinearpolarization,throughrotatingtheplaneofpolarizedlight45°intheforwarddirectionandanadditional45°ofnon-reciprocalrotationinthereversedirection.CASTECHfreespaceisolatorseriesinclude2types:PolarizationandPolarizationIndepent.Meanwhile,freespaceisolatorsincludefixedwavelengthisolatorsandwavelengthadjustableisolators.

CASTECH'sFreeSpaceIsolatorscouldmaintainthelight'slinearpolarization,throughrotatingtheplaneofpolarizedlight45°intheforwarddirectionandanadditional45°ofnon-reciprocalrotationinthereversedirection.CASTECHfreespaceisolatorseriesinclude2types:PolarizationandPolarizationIndepent.Meanwhile,freespaceisolatorsincludefixedwavelengthisolatorsandwavelengthadjustableisolators.

ThemaincomponentoftheopticalisolatoristheFaradayrotator.ThemagneticfieldB,appliedtotheFaradayrotatorcausesarotationinthepolarizationofthelightduetotheFaradayeffect.Theangleofrotationθisgivenbyθ=vBL,wherevistheVerdetconstantofthemagneto-opticmaterial,andListhelengthofthemagneto-opticmaterial.Specificallyforanopticalisolator,thevaluesarechosentogivearotationof45°.

Faradayrotatorisanimportantopticalelementinanisolator.ThecharacteristicsofaFaradayrotatorincludeahighVerdetconstant,lowabsorptioncoefficient,lownon-linearrefractiveindexandhighdamagethreshold.Thetwomostcommonlyusedmaterialsforthe700–1100nmrangeareterbiumdopedborosilicateglassandterbiumgalliumgarnetcrystal(TGG).Forinfraredwavelengthrange,typicallyforthe1300-4000nm,yttriumirongarnetcrystalsareused(YIG).

Opticalisolatoraccordingtoitsphysicalprinciplescanbedividedintopolarizationdependentisolatorandpolarizationindependentisolator.Thepolarizationdependentisolator,orFaradayisolator,ismadeofthreeparts,aninputpolarizer(polarizedvertically),aFaradayrotator,andanoutputpolarizer,calledananalyser(polarizedat45°).

Polarizationdependentisolatorsaretypicallyusedinfreespaceopticalsystems.Thisisbecausethepolarizationofthesourceistypicallymaintainedbythesystem.Inopticalfibresystems,thepolarizationdirectionistypicallydispersedinnonpolarizationmaintainingsystems.Hencetheangleofpolarizationwillleadtoaloss.



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