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Crystal
BIREFRIGENT CRYSTAL
PARAMETER

Physical and Optical Properties


Transparency Range500-4000nm350-2300nm190-3500nm
Crystal StructureTrigonalTrigonalTrigonal,Space Group R3c
Crystal ClassPositive UniaxialPositive UniaxialNegative Uniaxial
Crystal Cella=b=7.12 Å,c=6.29 Åa=6.37 Åa=b=12.532 Å,c=12.717 Å
Density4.22g/cm32.7g/cm33.85g/cm3
Hygroscopic SusceptibilityHighLowLow
Mohs Hardness534.5
Thermal Expansion Coefficientsaa=4.43*10﹣6/k

ac=11.37*10﹣6/k

aa=24.39*10﹣5/k

ac=5.68*10﹣5/k

Aa=4*10﹣6/k

Ac=36*10﹣6/k

Optical Homogeneity10﹣6/cm10﹣6/cm10﹣6/cm
Absorption Coefficient<0.1%@1064nm< td=""><0.1%@1064nm< td=""><0.1%@1064nm< td="">

Refractive Index,

Birefringence(△n=ne-no)

Walk-Off Angle@45°(ρ)

ne=2.2154,No=1.9929

△n=0.2251

ρ=6.042°@633nm

ne=1.48520,no=1.6557△n=0.1705

ρ=6.20°@633nm

ne=1.54381,no=1.67056

△n=0.1222

ρ=4.345°@532nm


Capabilities


DiameterMax.30-40mmMax.150mmMax.40-50mm
LengthMax.25-35mmMax.100mmMax.25-35mm
Surface QualityBetter than 20/10 Scratch/Dig Per MIL-0-13830A
Beam Deviation<10arc seconds
Optical Axis Orientation+/-0.2°
Flatness<λ/8@633nm
Transmission Wavefront Distortion<λ/4@633nm
Coating Upon Specification


BIREFRIGENT CRYSTAL


Transparency Range420-5200nm120-8500nm200-2300nm
Crystal StructureTrigonal,Space Group R3cTrigonal,Space Group R3cTrigonal,Space Group R3c
Crystal ClassPositive UniaxialPositive UniaxialNegative Uniaxial
Crystal Cella=5.14Åa=b=4.621 Å,c=3.053 Å
Density4.64g/cm33.18g/cm32.65g/cm3
Hygroscopic SusceptibilityLowLowLow
Mohs Hardness567
Thermal Expansion Coefficients

aa=2.0*10﹣6/k@25℃

ac=2.2*10﹣6/k@25℃


aa=6.23-9.25*10﹣6/k

ac=10.86-14.54*10﹣6/k

aa=6.2*10﹣6/k

ac=10.7*10﹣6/k


Optical Homogeneity5*10﹣5/cm10﹣6/cm10﹣6/cm
Absorption Coefficient<0.1%@1064nm< td=""><0.1%@1064nm< td=""><0.1%@1064nm< td="">

Refractive Index,

Birefringence(△n=ne-no)

Walk-Off Angle@45°(ρ)

ne=2.20263,no=2.28629

△n=0.08366

ρ=2.135°@633nm

ne=1.38876,No=1.37698

△n=0.01178

ρ=0.488°@633nm

ne=1.55170,No=1.54265

△n=0.00905

ρ=0.335°@532nm


Capabilities


DiameterMax.30-40mmMax.50mmMax.100mm
LengthMax.25-35mmMax.100mmMax.100mm
Surface QualityBetter than 20/10 Scratch/Dig Per MIL-0-13830A
Beam Deviation<10arc seconds
Optical Axis Orientation+/-0.2°
Flatness<λ/8@633nm
Transmission Wavefront Distortion<λ/4@633nm
Coating Upon Specification