A variety types of crystals are available upon your request:
- Crystal boules with inspection polishing
- Crystal blanks with inspection polishing
- Crystals with laser grade polishing
- Crystals with AR coating and Cr-Au electrod
.
Specifications of BBO for EO applications
|
Dimension tolerance
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(W±0.1mm)x(H±0.1mm)x(L+0.5/-0.1mm)
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Cut Angle
|
Z-Cut
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Clear aperture
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central 90% or the diameter
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Scattering of crystals
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No visible scattering paths or centers when inspected by a 50mW green Laser
|
Flatness
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less than λ/8 @ 633nm
|
Transmitting wavefront distortion
|
less than λ/8 @ 633nm
|
Chamfer
|
≤0.2mmx45°
|
Chip
|
≤0.1mm
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Surface Quality
|
better than 10/5 S/D (MIL-PRF-13830B)
|
Parallelism
|
≤20 arc seconds
|
Perpendicularity
|
≤5 arc minutes
|
Angle tolerance
|
≤0.25°
|
Coating
|
AR/AR@1064nm on both end surfaces
Cr-Au electrode on two side surfaces
|
Quality Warranty Period
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one year under proper use
|
Specifications of standard EO crystals
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Crystals
|
Betta BBO
|
Quarter-wave voltage@1064nm
|
~3.4KV (for crystals size: 3x3x20mm)
|
Optical transmission
|
>98% |
Damage Threshold
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>500MW/cm^2 @1064nm, 10nS
|
Wavefront distortion@1064nm
|
<Lambda/8
|
Typical capacitance
|
< 3pf
|
Standard Modules
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Size
|
SHBBO-EO320
|
3x3x20mm
|
SHBBO-EO420
|
4x4x20mm
|
SHBBO-EO425
|
4x4x25mm
|
If you need the BBO crystals of other size, please contact with us.
Calculation of Quarter-wave Voltage
The voltage required to produce a retardance of π radians is called the halfwave voltage or simply Vπ. For an optical input linearly polarized 45o applying a halfwave voltage rotates the polarization by 90o.When the output wave is passed through a linear the resultant can be rapidly modulated from maximum intensity to minimum intensity by rapidly changing the voltage applied to the crystal from 0 volts to Vπ.
The halfwave voltage of BBO is dependent on the optical wavelength and is given by:
Where λ=optical wavelength
d=electrode spacing
L=optical path length
r22=electro-optic coefficients
no=ordinary indices of refraction
EO Q-Switch 1/4Wave Voltage Vs Vavelength (3x3x20mm)
1/4 Wave Voltage @1030nm : Vπ/2 =3388V