α-BBO

High temperature phase of BaB 2 O 4 is an excellent birefringent crystal; it is characterized by large birefringent coefficient and wide transmission window from 189nm to 3500nm, particularly it is suitable to make the high power UV polarizer, due to its unique UV transparency and good mechanical properties.

The physical, chemical, thermal and optical properties of a -BBO crystals are similar to those of b -BBO, for instant high optical homogeneity(better than 1x10-6/cm), extremely low absorption in the UV to IR range (<0.5% from 300-2300nm), low hygroscopic susceptibility, high damage threshold.

Capabilities:

1)	Diameter : max 40~50mm
2)	Length: max 25~35mm
3)	Surface Quality: better than 20/10 scratch/dig Per MIL-0-13830A
4)	Beam Deviation: <3 arc min
5)	Optical Axis Orientation: +/-0.5°
6)	Flatness: < l/4 @633nm
7)	Transimission Wavfront Distortion: <l/2 @633nm
8)	Coating: upon customer's specification

Physical and Optical Properties:

Transparency Range	189~3500nm
Density	3.85g/cm
Therm-Optic Coefficients	dn_o/dT= - 9.3x10 /°C
dn_e/dT= - 16.6x10 /°C
Optical Homogeneity	Δn ≈ 10^-6 /cm
Mohs Hardness	4.5 glass like
Damage Threshold	1GW/cm² at 1064nm
200MW/cm² at 532nm
Thermal Expansion Coefficients	αa=4x10^-6 /K
(25°C~900°C)	αc=36x10^-6 /K
Linear Absorption Coefficients	a<0.005cm^-1 from 300nm to 2300nm
Refractive Indices	ne=1.53797, no=1.65790,Δn= - 0.11993, ρ= - 4.9532°,at 1064nm
Birefringence(Δn=n_e - n_o)	ne=1.55345, no=1.67755,Δn= - 0.12411, ρ= - 5.0407°,at 532nm
and Walk-Off angle at 45°C(ρ)	ne=1.61145, no=1.76171,Δn= - 0.15026, ρ= - 5.6926°,at 266nm
Sellmeier equation (λ in μm)	n^_o2= 2.7471+0.01878/(λ² -0.01822)-0.01354λ²
Sellmeier equation (λ in μm)	n_e ²= 2.37153+0.01224/(λ² -0.01667)-0.01516λ²

YVO4 Calcite

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