Product Name: Customized High Quality Bk7 Optical Glasss Window Lens Coating: HC Customized: Customized Lenses Color: Clear Material: Bk7, K9 Shape: Single-lens Transmittance: >95% Type: Flat Lens Usage: Lighting, Medical, Optical, Photography Diameter: 5~300mm Thickness: Bigger Than 0.3mm Surface Quality: 40/20, 60/40, 80/50 Trademark: Realpoo Transport Package: Protective Packing Specification: 16*16*16cm Origin: Cn HS Code: 9001909090 Product Description Opticalwindowsrefertoapieceoftransparentopticalmaterialthatallowslightintoanopticalinstrument.Theyarepiecesofopticalglasseswithgroundandpolishedfacesthatarerelativelyparallel.Opticalwindowsareappliedforprotectingfragileopticalcomponentsinsideanequipment,theyareadoptedtoisolatetwophysicalenvironmentswhileallowinglighttopass.Opticalwindowmaterialscomparison:MaterialPropertiesApplicationsBK7TransmissionRange:330-2100nmRefractiveIndex:1.5164@588nmMostpopularandlowcostVisibleandnearIRspectrumapplicationsFusedSilicaTransmissionRange:185-2500nmRefractiveIndex:1.4858@308nmLowThermalExpansionCoefficient:0.54x10-6KUVtoIRspectrumBestchoiceforthermalresistanceapplication.SapphireTransmissionRange:180-4500nmRefractiveIndex:1.755@1000nmStrongHardnessBestchoiceforscratchresistanceapplicationsThinneropticsWideTransmissionRangeCalciumFluorideTransmissionRange:170-7800nmRefractiveIndex:1.399@5000nmLittleHygroscopicSusceptibilityHighThermalExpansionCoefficient:18.85x10-6KIRlaserapplicationsMgF2TransmissionRange:120-7000nmRefractiveIndex:1.376@700nmUVlaserapplicationsWe will process as the drawings and requirements rigorously.Our engineer will check or design the drawings according to the details.We have some stock lenses offered.