简介：Aneworganic-inorganichybridmaterial,whichshowsphoto-inducedreductionofrefractiveindexaswellasvolumecontraction,ispreparedusingasol-gelmethod.ThismaterialiscoatedonaSisubstratebyspin-coatingtomanufacturefilm.Afterirradiatedbyultraviolet(UV)lightwithadeuteriumlampfor5h,thethicknessoffilmdecreaseslargelyby55%,andtherefractiveindexoffilmchangesfrom1.484to1.445at550nm.Thefilm'sopticalthicknessexhibitsanexponentialchangewiththeincreasingirradiationtime.Futhermore.thephoto-patternningoftheorganic-inorganichybridfilmwithoutanyfurtherprocess(wetetchingandthermalcuring)isperformedutilizingthevolumecontractiononUV-lightirradiation.Thisfilmhaspotentialapplicationsforfabricationofpatternedfilterarrayandapodizingfilterbydirectlightwriting,andalsodemonstratesgoodtemperaturestabilityandimmunitytovisiblelightexposure.

简介：HighorderBraggscattering(M=2andM=3)operationsofthedistributedfeedbackdyedopedsol-gelsilicalasersareachievedusingthesecondharmonicoutputofaNd:YAGlaserasthepump.Laserlinewidthoflessthan0.06nmandconversionefficiencyof0.7%forM=3and11%forM=2aremeasured.Wavelengthtuningofabout15nmaroundtheemissioncenterhasbeenrealizedbyvaryingtheintersectionangle.

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