α-BBO crystal
High temperature phase of BaB2O4 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 β-BBO crystals are similar to those of α-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. However, the nonlinear optical propertie of α-BBO is vanished due to the centric symmetry with its crystal structure. a-BBO is an excellent crystal to replace Calcite, TiO2, and LiNbO3, etc. in Glan-Taylor and Glan-Thompson polarizers as well as walk-off beam splitters, especially for high power and UV polarizer, due to its unique UV transparency, good mechanical properties and high damage threshold.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Diameter | max. 40~50 |
| Length | max. 25~35 |
| Surface Quality | 2 0/10 |
| Optical Deviation | <1 arc min |
| Optical Axis Orientation | +/-0.5 |
| Flatness [633nm] | <λ/8 |
| Wave Front [633nm] | <λ/8 |
| Coating | According to custmer request |
| Transparency Range | 189-3500 nm |
| Density | 3.85 g/cm3 |
| Therm-Optic Coefficients dnₒ/dT | -9.3X10⁻⁶ |
| Therm-Optic Coefficients dnₑ/dT | -16.63X10⁻⁶ |
| Optical Homogeneity Δn | ≈10⁻⁶ |
| Damage Threshold [1064nm] | 1 GW/cm2 |
| Damage Threshold [532nm; com is the original table's unit spelling] | 500 MW/com² |
| Hygroscopic Susceptibility | Low |
| Thermal Expansion Coefficients aa [25℃-900℃] | 4X10⁻⁶ |
| Thermal Expansion Coefficients ac [25℃-900℃] | 4X10⁻⁶ |
| Linear Absorption Coefficients [300-2300nm] | <0.005 cm⁻¹ |
| Refractive Indices nₑ [1064nm] | 1.58462 |
| Refractive Indices nₒ [1064nm] | 1.65790 |
| Birefringence Δn [1064nm；Δn=nₑ-nₒ] | -0.073282 |
| Walk-Off Angle ρ [1064nm; Original header at 45℃; Final o is an ordinary letter] | -4.9532o |
| Refractive Indices nₑ [532nm] | 1.60206 |
| Refractive Indices nₒ [532nm] | 1.67755 |
| Birefringence Δn [532nm；Δn=nₑ-nₒ] | -0.075491 |
| Walk-Off Angle ρ [532nm; Original header at 45℃; Final o is an ordinary letter] | -5.0407o |
| Refractive Indices nₑ [266nm] | 1.67190 |
| Refractive Indices nₒ [266nm] | 1.76171 |
| Birefringence Δn [266nm；Δn=nₑ-nₒ] | -0.089805 |
| Walk-Off Angle ρ [266nm; Original header at 45℃; Final o is an ordinary letter] | -5.6926o |
Datasheet
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