CaF2

Calciumfluoridecrystalisakindoffluoridecrystals.Theadvantageofthismaterialisthewideapplicationbandwidth,whichcanbeusedin155nm-7000nm.Italsoshowshighlaserdamagethreshold,lowstressbirefringenceandhighrefractiveindex.Thedefectisthesofthardnessanditisnottemperatureresistant.Itcanbeusedinthefieldsoflaser（especiallydeepUVexcimerlaserlithography）,infrared,UVoptics,highenergydetection,asthebestmaterialformakingopticalelementssuchasopticalprisms,lensesandwindowsinopticalsystems. Transmission 氟化钙晶体性能IndicatornameNumericalvaluepurity%99.999densityg/cm33.18Thermalexpansioncoefficient1/℃1.89×10-5Refractiveindex5mm1.39908ThermalconductivityJ/k.m.s9.71Dielectricconstant1KHZ6.76HeatcapacityJ/g.K0.854Kjeldahlhardnesskg/mm2158.3Young'smodulusGPa75.8Meltingpoint℃1360Poisson'sratio0.26

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Category：Optic quartz

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　　Calcium fluoride crystal is a kind of fluoride crystals. The advantage of this material is the wide application band width, which can be used in 155nm - 7000nm. It also shows high laser damage threshold, low stress birefringence and high refractive index. The defect is the soft hardness and it is not temperature resistant. It can be used in the fields of laser（especially deep UV excimer laser lithography）, infrared, UV optics, high energy detection, as the best material for making optical elements such as optical prisms, lenses and windows in optical systems.

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氟化钙晶体性能

Indicator name	Numerical value	purity %	99.999
density g/cm³	3.18	Thermal expansion coefficient 1/℃	1.89×10^-5
Refractive index 5mm	1.39908	Thermal conductivity J/k.m.s	9.71
Dielectric constant 1KHZ	6.76	Heat capacity J/g.K	0.854
Kjeldahl hardness kg/mm²	158.3	Young's modulus GPa	75.8
Melting point ℃	1360	Poisson's ratio	0.26