概述
β phase metabarium metaborate (BBO) crystal can transmit a wide range of wavelengths (190-3500nm), especially the ultraviolet band has good transmission, the disadvantage is that it has a small receiving angle and a large divergence angle, BBO crystal has a high damage domain value, suitable for high power, good optical uniformity, is a highly efficient nonlinear crystal.
It can be widely used in different types of lasers such as dye lasers, ultrafast pulse lasers, titanium sapphire, argon ion lasers and copper vapor lasers, such as 1064nm and 800nm two, third and quadruple frequency, in addition, the OPO and OPA systems of BBO crystals can also be used to produce a wide range of tunable coherent optical output from ultraviolet to infrared, with good electro-optical effect, and are also a kind of electro-optical crystal that is most commonly made into electro-optical Q-modulation and modulation devices.
General parameters
| Form Tolerance(mm) | ±0.1 | Length tolerance(mm) | ±0.2 |
| Effective aperture | >90% | Face | ＜λ/8@633nm |
| Through wavefront distortion | ＜λ/4@633nm | Eccentricity | ＜20〞 |
| Side verticality | ＜5ˊ | Finish | 20/10 |
| Chamfering | Protective＜0.1mm×45° | End face coating | Both end faces are coated with anti-reflection film, and the residual reflectivity on one side is residual R＜0.5%@532&1064nm |
Peculiarity
- Very superior physical and mechanical properties
- Wide band range for phase matching (410-3500nm)
- Wide light transmission range (190-3500nm)
- High frequency doubling conversion efficiency (6 times KDP)
- High damage threshold
- Good optical uniformity
- Wide temperature reception angle (55°)
Physical and optical properties
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Crystal structure |
Trigonal crystal system, space group R3c |
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Lattice parameters |
a=b=12.532Å, c=12.717Å, Z=6 |
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Melting point |
1095±5℃ |
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Curie Point |
925±5℃ |
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Optical uniformity |
10-6/cm |
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Mohs hardness |
4.5 |
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Density |
3.85g/cm3 |
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Linear absorption coefficient |
＜0.1%/cm (at 1064 nm) |
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Deliquescence |
Low | |
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Resistivity |
＞1011 ohm/cm |
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Relative dielectric constant |
eT11/e0: 6.7, eT33/e0: 8.1 |
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Warm light coefficient(25-900℃) |
⊥c, 4 x 10-6/K; ||c, 36 x 10-6/K |
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Thermal conductivity |
⊥c, 1.2 W/m/K; ||c, 1.6 W/m/K |
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Transmission range |
189-3500 nm |
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Thermophotovoltaic coefficient |
dno/dT=-9.3x10-6/0C; dne/dT=-16.6x10-6/0C |
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Nonlinear coefficients |
d11=5.8xd36(KDP) |
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Electro-optical coefficient |
g11=2.7 pm/V, g22, g31<0.1 g11 |
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Half-wave voltage |
48 KV (at 1064nm) |
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Frequency doubling phase matching band |
189-1750nm |
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Damage threshold |
@1.064um |
5 GW/cm2 (10 ns); 10 GW/cm2 (1.3 ns) |
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@0.532um |
1 GW/cm2 (10 ns); 7 GW/cm2 (250 ps) |
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@0.266um |
120 MW/cm2 (8ns) |
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Sellmeier equation (λ in um) |
no2(λ)=2.7359+0.01878/(λ2-0.01822)-0.01354λ2 |
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