Optics Material
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Optics Material
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Optical Crystal Sapphire Crystal Undoped YAG Crystal CaF2
Basic Properties
Crystal structure Hexagonal System Cubic cubic
Lattice Constant a=4.75;c=12.97   a=5.462
Density 3.98g/cm3 4.5g/cm3 3.18 g/cm3
Transmission Range 150~5500nm 250~5000nm 170 nm~7800 nm
Melting Point 2030? 1970 °C 1360 °C
Specific Heat 0.418 W.s/g/K 0.59 W.s/g/K  
Thermal Conductivity 25.12 W/m/K 14 W/m/K 9.71W/m/K
Thermal Shock Resistance 790 W/m 790 W/m  
Thermal Expansion Coefficient 5.8x10-6 /K 6.9x10-6 /K 18.85X10-6 /K
dn/dt, @633nm 13x10-6 /K 7.3x10-6 /K -1  
Mohs Hardness 9 8.5 6
Refractive Index 1.83 @0.26 mm, 1.76 @0.63 mm,1.58 @5.57 mm 1.8245 @0.8 mm 1.8197 @1.0 mm 1.8121 @1.4 mm 1.6921mm - 1.3161mm
Specifications of Windows and Mirrors
Diameter +/-0.0, -0.1mm +/-0.1mm +/-0.0, -0.1mm
Thickness +/-0.2mm +/-0.2mm +/-0.2mm
Flatness better than ? per 25 @633nm better than ?/8@633nm better than ? per 25 @633nm
Parallelism better than 3' better than 30'' better than 3'
Perpendicularity better than 5' better than 5' better than 5'
Scratch-Dig 80-50 per MIL-O-13830A 10-5 per MIL-O-1383A 80-50 per MIL-O-13830A
Wavefront Distortion less than l /2 per inch @1064nm better than l /2 per inch@1064nm less than l /2 per inch @1064nm

Days Optics offers a wide variety of quality optics from conventional optical components like optical crystals and crystal optics. We provide high quality optical components, including crystals and optics for a wide range of optical crystal requirements. Manufacture Crystal Optical Components such as Optical Windows, Lenses, BeamSplitters for Lasers and as per customer's specifications.