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偏硼酸鋇(α-BBO)

 

偏硼酸鋇(α-BBO)晶體是一種優異的雙折射材料,具有非常良好的光學性能,在紫外到中紅外都具有很好的透過。α-BBO晶體內部質量良好,吸收小,并且由于具有良好的紫外透過,被廣泛應用于高消光比、深紫外激光系統中,主要加工成格蘭偏振棱鏡和偏振分束器、補償器等等..

應用:格蘭棱鏡、偏振分束器、補償器等等..


 

Specifications:

Diameter:
Max 50m
Length:
Max 35mm
Surface Quality:
better than 20/10 scratch/dig
Beam Deviation:
< 3 arc min
Optical Axis Orientation:
+/-0.2deg
Flatness:
< λ/4 @632.8nm
Wavefront Distortion:
< λ/2 @632.8nm
Coating:
Coating upon Request

Properties:

Transmitting range
189nm~3500nm
Density
3.85g/cm3
Therm-Optic Coefficients
dno/dT=-9.3 x 10-6/ °C
dno/dT=-16.6x10-6/ °C
Optical Homogeneity
Δn≈10-6/cm
Mohs Hardness
4.5
Damage Threshold
1GW/cm2 at 1064nm
500MW/cm2 at 532nm
Hygroscopic Susceptibility
Low
Thermal Expansion Coefficients
αa=4x10-6
(25 °C - 900 °C)
αa=4x10-6
Linear Absorption Coefficients
a<0.005cm-1 from 300nm to 2300nm
Refractive Indices,
Birefringence(△n=ne-no)
and wal-off Angle at 45 °C(ρ)
ne=1.58462,no=1.65790,?n=-0.073282;ρ=-4.9532° at 1064nm
ne=1.60206,no=1.67755,?n=-0.075491;ρ=-5.0407° at 532nm
ne=1.67190,no=1.76171,?n=-0.089805;ρ=-5.6926° at 266nm
Sellmeier equation(l in μm)
no2=2.7471+0.01878/( λ2-0.01822)-0.01354 λ2
ne2=2.3174+0.01224/( λ2-0.01667)-0.01516 λ2

 

Note: Kinds of sizes, cut angle, coating are available upon request.


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