Birefringent Crystal

Laser Crystal	YVO4	Calcite	a-BBO

Physical and Optical Properties
Transparency Range	400~5000nm	350~2300nm	189~3500nm
Crystal Structure	trigonal, space group R3c	Trigonal, space group R 3c	trigonal, space group R3c
Crystal Class	Positive uniaxial	Positive uniaxial	Negative Uniaxial
Crystal Cell	a =b= 7.12Å, c= 6.29Å	a =b= 4.621Å, c= 3.053Å	a=b=12.532Å, c=12.717Å
Density	4.22 g/cm3	3.18 g/cm3	3.85g/cm3
Hygroscopic Susceptibility	Low	Low	Low
Mohs Hardness	5	6	4.5
Thermal Expansion Coefficients	aa=4.43x10-6/k ac=11.37x10-6/k	aa=6.23-9.25 x 10-6 /k ac=10.86-14.54 x 10-6 /k	aa=4 x 10-6 /k cc=36 x 10-6 /k
Optical Homogeneity	10-6 /cm	10-6 /cm	10-6/cm
Absorption Coefficient	0.05%/cm-1 @1064nm	0.07@0.2m 0.02@5.0m	0.05%/cm-1 @1064nm
Refractive Index, Birefringence(Δn = ne - no) and Walk-Off Angle at 45 deg(ρ)	ne = 2.2154, no = 1.9929, Δn=0.2251, ρ=6.042°@ 633nm	ne = 1.48520, no = 1.65578 Δn=0.17058, ρ=6.205°@ 633nm	ne = 1.67056, no = 1.54831, Δn=0.1222; ρ=4.345°@ 532nm
Capabilities
Diameter	max. 30~40mm	max. 150	max. 40~50mm

Laser Crystal	LiNbO3	MgF2	Quartz

Physical and Optical Properties
Transparency Range	420 ~ 5200 nm	0.12~8.5nm	200~2300nm
Crystal Structure	Trigonal, space group R 3c	Trigonal, space group R 3c	Trigonal, space group R 3c
Crystal Class	Negative Uniaxial	Positive Uniaxial	Positive Uniaxial
Crystal Cell	a =b= 0.515Å , c= 13.863Å	a = 4.621Å, c= 3.053Å
Density	4.64 g/cm3	3.18 g/cm3	2.65 g/cm3
Hygroscopic Susceptibility	Low	Low	Low
Mohs Hardness	5	6	7
Thermal Expansion Coefficients	aa=2.0 x 10-6 /k @ 25°C cc=2.2 x 10-6 /k @ 25°C	ac= 10.86-14.54x10-6/k aa= 6.23-9.25x10-6/k	aa=6.2x10-6/k ac=10.7x10-6/k
Optical Homogeneity	~ 5 x 10-5 /cm	10-6/cm	10-6/cm
Absorption Coefficient	0.1%/cm @ 1064 nm	0.07 at 0.2 µm;0.02 at 5.0 µm	0.1%/cm @ 1064 nm
Refractive Index, Birefringence(Δn = ne - no) and Walk-Off Angle at 45 deg(ρ)	ne = 2.20263, no = 2.28629 Δn=0.08366, ρ=2.135°@ 633nm	ne = 1.38876, no = 1.37698 Δn=0.01178, ρ=0.488°@ 633nm	ne = 1.55170, no = 1.54265 Δn=0.00905, ρ=0.335°@ 633nm
Capabilities
Diameter	max. 30~40	max. 50mm	max. 100mm
Length	max. 25~35mm	max. 100mm	max. 100mm
Surface Quality	better than 20/10 scratch/dig Per MIL-0-13830A	better than 20/10 scratch/dig Per MIL-0-13830A	better than 20/10 scratch/dig Per MIL-0-13830A
Beam Deviation	<10 arc second	<10 arc second	<10 arc second
Optical Axis Orientation	+/-0.2°	+/-0.2°	+/-0.2°
Flatness	<λ/8 @633nm	<λ/8 @633nm	<λ/8 @633nm
Transmission Wavefront Distortion	<λ/4 @633nm	<λ/4 @633nm	<λ/4 @633nm
Coating	upon specification	upon specification	upon specification

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