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α-BBO

 

Description:

High temperature phase of α-BBO Crystal (BaB2O4) is one of the excellent birefringent crystals. It is characterized by large birefringent coefficient and wide transmission window ranged from 189nm to 3500nm. Due to its high chemical stability and medium hardness, α-BBO is fabricated easily into many kinds of optical components.

 

Physical and optical properties:

Transparency range 189-3500nm
Density3.85g/cm3
Thermo-optic coefficientsdno / dT = -9.3 X 10-6/℃, dne / dT = -16.6.3 X 10-6 /℃
Optical homogeneityΔn≈10-6/cm
Damage threshold1 GW/cm2@1064nm; 500 MW/cm2@532nm
Hygroscopic susceptibilityLow
Thermal expansion coefficientsaa = 4 X 10-6 / K, ac = 4 X 10-6 / K
(25ºC-900ºC)
Linear absorption coefficientsα<0.005cm-1 from 300nm to 2300nm
Refractive indices, birefringencene=1.58462, no=1.65790,Δn=-0.073282; ρ=-4.9532º @1064nm
(Δn=ne-no) and walk-off angle at 45ºne=1.60206,no=1.67755,Δn=-0.075491; ρ=-5.0407º @ 532nm
ne=1.67190,no=1.76171,Δn=-0.089805; ρ=-5.6926º @ 266nm

 

Specifications:

Diameter40~50mm
Length25~35mm
Surface Quality20/10 Scratch/Dig
Beam deviation< 3 arc min
Optical axis orientation+/-0.5º
FlatnessBetter than λ/8 @633nm
Transmission wave front distortion<λ/4 @633nm
Coatingupon customer's request