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α-BBO Calcite Crystal Birefringence 3500nm Negative Crystal

Categories Laser Crystals
Brand Name: STAR OPTIC
Model Number: α-BBO
Certification: RoHS, ISO9001
Place of Origin: Wuhan, China
MOQ: 1pc
Price: Negotiable
Payment Terms: T/T, Western Union, Paypal
Supply Ability: 50000pcs/Month
Delivery Time: Negotiable
Packaging Details: Safe and dust-free packing
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α-BBO Calcite Crystal Birefringence 3500nm Negative Crystal


Overview:

High temperature form BBO (α-BaB2O4) is an excellent negative uni-axial birefringent crystal. It has large birefringence coefficient and good transmission over a broad range, from 189nm to 3500nm. Unlike ß-BBO, α-BBO is not useful for NLO application due to the centric symmetry with its crystal structure.

α-BBO is excellent crystal in Glan Taylor, Glan Laser and Glan Thompson polarizer as well as walk-off beamsplitters, especially for high power and UV polarizers. This is due to their unique UV transparency, good mechanical properties and high damage threshold. Union Optic manufactures many Glan polarizers and beam displacers from high quality α-BBO crystals for UV and high power operations.


General Specifications Of α-BBO:

Dimension Tolerance±0.1mm
Optical Axis Orientation±0.5deg
Surface Quality20/10 Scratch and Dig
Clear Aperture>90%
Surface Flatness<λ/4@633nm
Wavefront Distortion<λ/2@633nm
Parallelism<15 arc seconds
Beam Deviation<3 arc minutes
AR CoatingUpon Request

Physical and Optical Properties of α-BBO:

Transparency Range189~3500nm
Density3.85g/cm3
Mohs Hardness4.5 glass like
Optical HomogeneityΔn≈10-6/cm
Therm-Optic Coefficientsdno/dT= - 9.3x10-6/°C
dne/dT= - 16.6x10-6/°C
Thermal Expansion Coefficients(25°C~900°C)aa=4x10-6/K
ac=36x10-6/K
Linear Absorption Coefficientsa<0.005cm-1 from 300nm to 2300nm
Damage Threshold1GW/cm2 at 1064nm, 200MW/cm2 at 532nm

Refractive Index

Birefringence (Δn=ne-no)

Walk-Off Angle at 45 deg(ρ)

ne=1.53797, no=1.65790, Δn= - 0.11993, ρ= - 4.9532° at 1064nm
ne=1.55345, no=1.67755, Δn= - 0.12411, ρ= - 5.0407° at 532nm
ne=1.61145, no=1.76171, Δn= - 0.15026, ρ= - 5.6926° at 266nm
Sellmeier Equations (λ in um)no2=2.7471+0.01878/( λ2-0.01822)-0.01354λ2
ne2=2.37153+0.01224/(λ2-0.01667)-0.01516λ2


Quality α-BBO Calcite Crystal Birefringence 3500nm Negative Crystal for sale
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