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Applications: |
◆Second, third, fourth and fifth harmonic generation of Nd:YAG and Nd:YLF laser |
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◆Frequency-doubling, -tripling and -mixing of Dye lasers |
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◆Second, third and fourth harmonic generation of Ti:Sapphire and Alexandrite lasers |
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◆Optical parametric amplifier (OPA) and optical parametric oscillators (OPO) |
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◆Frequency-doubling of Argon ion, Cu-vapor and Ruby lasers |
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◆Research and development for advanced laser techniques, including all-solid state wide-tunable lasers, ultrafast pulse lasers, and DUV lasers. |
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Features: |
◇Broad phase-matching range from 409.6 nm to 3500nm |
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◇Wide transmission range from 190 nm to 3500nm |
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◇Large effective second-harmonic-generation (SHG) coefficient about 6 times greater than that of KDP crystal |
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◇High damage threshold of 10GW/cm2 for 100ps pulse-width at 1064nm |
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◇High optical homogeneity with δn≈10-6/cm |
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◇Wide temperature-bandwidth of about 55°C |
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Main Specification |
Material |
β-BaB2O4 |
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Length/Thickness |
0.01 ~ 25mm |
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Phase matching angle θ and φ |
Determined by different kinds of harmonic generation. |
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Phase matching type |
Type I or Type II |
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Coating |
P-coatings, AR-coatings and mounts |
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Angle tolerance |
Δθ< ± 0.5°; Δφ< ±0.5° |
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Dimension tolerance |
(W ± 0.1mm) × (H ± 0.1mm) × (L + 0.2mm/-0.1mm) |
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Flatness |
λ/8 @ 633nm |
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Surface quality |
10/5 scratch/dig per MIL-O-13830A |
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Parallelism |
<20 arc sec |
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Perpendicularity |
5 arc min |
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Wavefront distortion |
< λ/8 @ 633nm |
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Clear aperture |
> 90% central area |
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Physical Properties |
Crystal Structure |
Trigonal, space group R3c |
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Cell Parameters |
a = b = 12.532Ä, c = 12.717Ä, Z = 6 |
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Melting Point |
1095 ± 5°C |
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Transition Temperature |
925 ± -5°C |
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Optical Homogeneity |
dn ≈10-6/cm |
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Hardness |
4.5 Mohs |
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Density |
3.85 g/cm3 |
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Specific heat |
490 J/kg/°C |
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Absorption Coefficient |
< 0.1%/cm (at 1064 nm) |
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Hygroscopic Susceptibility |
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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Tan d, < 0.001 |
Thermal Expansion Coefficients |
a, 4 x 10-6/K |
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(in the range of 25°C- 900°C) |
c, 36 x 10-6/K |
Thermal Conductivity |
^c, 1.2 W/m/K; ||c, 1.6 W/m/K |
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Thermal conductivity coefficients |
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Linear Optical Properties |
Transparency Range |
189 - 3500 nm |
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Refractive Indices |
ne = 1.5425, no = 1.6551 @ 1064 nm |
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ne = 1.5555, no = 1.6749 @ 532 nm |
ne = 1.6146, no = 1.7571 @ 266 nm |
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Therm-Optic Coefficients |
dno/dT = - 9.3 x 10-6/°C |
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dne/dT = -16.6 x 10-6/°C |
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Sellmeier Equations:/(λ in μm) |
no2(l) = 2.7359+0.01878/(l2-0.01822)-0.01354 l2 |
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ne2(l) = 2.3753+0.01224/(l2-0.01667)-0.01516 l2 |
Nonlinear Optical Properties |
Phase-matchable SHG range |
189 - 1750nm |
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NLO coefficients |
d11 = 5.8 x d36(KDP) |
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d31 = 0.05 x d11 |
d22< 0.05 x d11 |
Electro-Optic Coefficients |
a1 = 11 x 10-6 °C-1 |
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a2 = 9 x 10-6 °C-1 |
a3 = 0.6 x 10-6 °C-1 |
Half-Wave Voltage |
48 KV (at 1064 nm) |
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Damage Threshold |
5 GW/cm2 (10 ns) @1064nm |
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10 GW/cm2 (1.3 ns) @ 1064 nm |
1 GW/cm2 (10 ns) @532 nm |
7 GW/cm2 (250 ps) @ 532 nm |
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Notice |
★BBO is hygroscopic. In application, protective coating or AR coating or crystal housing is usually recommended. |
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★Engineers can select and design the best solution for you, if the main parameters of your laser are provided, such as energy per pulse, pulse width and repetition rate for a pulsed laser, power for a cw laser, laser beam diameter, mode condition, divergence, wavelength tuning range, etc. |
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