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α-BBO Calcite Crystal Birefringence 3500nm Negative Crystal

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

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Product Details
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Α-BBO Calcite Crystal Birefringence

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Negative Crystal Α-BBO

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3500nm Negative Crystal
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Product Description

 

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 Quality 20/10 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 Coating Upon Request

 

 

 

Physical and Optical Properties of α-BBO:

Transparency Range 189~3500nm
Density 3.85g/cm3
Mohs Hardness 4.5 glass like
Optical Homogeneity Δn≈10-6/cm
Therm-Optic Coefficients dno/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 Coefficients a<0.005cm-1 from 300nm to 2300nm
Damage Threshold 1GW/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

 

 

 

 

 

Tags:

BBO Nonlinear Crystal

Nd Yag Laser Rods

Negative Uniaxial Crystal