BBO or beta-BaB2O4 is a nonlinear optical crystal which combines a number of
unique features. These features include wide transparency and phase matching ranges, large
nonlinear coefficient, high damage threshold and excellent optical
homogeneity. Therefore, BBO provides an attractive solutions for various nonlinear optical
applications.
Application:
- Second, third, fourth and fifth harmonic generation of
Nd:YAG and Nd:YLF laser
- Frequency-doubling, -tripling and -mixing of Dye
lasers
- Second, third and fourth harmonic generation of
Ti:Sapphire and Alexandrite lasers
- Optical parametric amplifier (OPA) and optical
parametric oscillators (OPO)
- Frequency-doubling of Argon ion, Cu-vapor and Ruby
lasers
- Research and development for advanced laser
techniques, including all-solid state wide-tunable lasers, ultrafast
pulse lasers, and DUV lasers.
Features:
- Broad phase-matching range from 409.6 nm to 3500nm
- Wide transmission range from 190 nm to 3500nm
- Large effective second-harmonic-generation
(SHG)
coefficient about 6 times greater than that of KDP crystal
- High damage threshold of 10GW/cm2 for
100ps pulse-width at 1064nm
- High optical homogeneity with δn≈10-6/cm
- Wide temperature-bandwidth of about 55°C
Main Specification
|
|
Aperture |
1x1 ~ 15x15mm |
Length |
0.01 ~
25mm |
Phase
matching angle θ and φ |
Determined
by different kinds of harmonic generation. |
Phase
matching type |
Type I or
Type II |
End
configuration |
Flat or
Brewster or Specified |
Coating |
P-coatings, AR-coatings and mounts |
Angle
tolerance |
Δθ< ±
0.5°; Δφ< ±0.5° |
Dimension
tolerance |
(W ±
0.1mm) x (H ± 0.1mm) x (L + 0.2mm/-0.1mm) |
Flatness |
λ/8 @ 633nm |
Surface
quality |
10/5
scratch/dig per MIL-O-13830A |
Parallelism |
better
than 20 arc seconds |
Perpendicularity |
5 arc
minutes |
Wavefront
distortion |
less than
λ/8 @ 633nm |
Clear
aperture |
> 90%
central area |
|
Notes: To inquiry or order
a finished BBO crystals, please provide specifications as listed in the above.
For nonlinear crystals, the maximum conversion efficiency is mainly determined by three specification: crystals length, phase matching type,
and phase matching angles(θand φ).
Physical Properties
|
|
Crystal
Structure |
Trigonal,
space group R3c |
Cell
Parameters |
a = b =
12.532Ä, c = 12.717Ä, Z = 6 |
Melting
Point |
1095
± 5°C |
Transition
Temperature |
925
± -5°C |
Optical
Homogeneity |
dn ≈10-6/cm |
Hardness |
4.5 Mohs |
Density |
3.85
g/cm3 |
Absorption
Coefficient |
<
0.1%/cm (at 1064 nm) |
Hygroscopic
Susceptibility |
low |
Resistivity |
> 1011
ohm-cm |
Relative
Dielectric Constant |
eT11/e0: 6.7,
eT33/e0: 8.1 Tan d, < 0.001 |
Thermal
Expansion Coefficients
(in the range of 25°C- 900°C) |
a, 4 x
10-6/K c, 36 x 10-6/K |
Thermal
Conductivity |
^c, 1.2 W/m/K; ||c, 1.6 W/m/K |
Linear
Optical Properties |
|
Transparency Range |
189 - 3500
nm |
Refractive
Indices at 1.0642 mm at 0.5321 mm at 0.2660 mm |
ne =
1.5425, no = 1.6551 ne =
1.5555, no = 1.6749 ne = 1.6146,
no = 1.7571 |
Therm-Optic
Coefficients |
dno/dT = - 9.3 x 10-6/°C dne/dT = -16.6 x 10-6/°C |
Sellmeier
Equations: |
no2(l) =
2.7359+0.01878/(l2-0.01822)-0.01354
l2 ne2(l) =
2.3753+0.01224/(l2-0.01667)-0.01516
l2 |
Nonlinear Optical
Properties |
|
Phase-matchable SHG
range |
189 - 1750nm |
NLO
coefficients |
d11 = 5.8
x d36(KDP) d31 =
0.05 x d11
d22<
0.05 x d11 |
Electro-Optic
Coefficients |
g11 = 2.7
pm/V, g22,
g31<
0.1 g11 |
Half-Wave
Voltage |
48 KV (at
1064 nm) |
Damage
Threshold at 1.064 mm at 0.532 mm |
5 GW/cm2 (10 ns); 10 GW/cm2 (1.3 ns)
1 GW/cm2 (10 ns); 7 GW/cm2 (250 ps) |
|
|