Beta-Barium Borate (β-BaB2O4,BBO)
*Second, third, fourth and fifth harmonic generation
*Frequency double, tripling and mixing of Dye and Ti :Sapphire lasers
*Optical Parametric amplifiers(OPA) and optical parametric oscillators(OPO)
Advantages:
*Broad phase-matching wavelength range from 409.6 nm to 3500 nm
*Wide transmission region from 190 nm to 3500 nm
*Large effective SHG coefficient about 6 times greater than that of KDP crystal
*High damage threshold of 10 GW/cm2 for 100 ps pulse-width at 1064 nm
*High optical homogeneity with Δn ~ 10-6/cm
*Wide temperature-bandwidth of about 55°C(for type I SHG 1064nm)
*Good Mechanical and physical properties
|
Crystal Structure: |
Trigonal, space group R3c |
|
Lattics Parameters: |
a=b=12.532Å, c=12.717Å, Z=6 |
|
Melting point |
About 1095℃ |
|
Mohs Hardness |
4 |
|
Density |
3.85g/cm3 |
|
Thermal Conductivity |
1.2W/m/K(┴c): 1.6W/m/K(//c) |
|
Thermal Expansion Coefficients |
a11=4x10-6/K; a33=36x10-6/K |
|
Transparency Range: |
190-3500nm |
|
SHG Phase Matchable Range |
409.6-3500nm(Type I) 525-3500nm(Type II) |
|
Therm-optic Coefficients(/℃) |
dno/dT=-16.6X10-6 |
|
dne/dT=-9.3X10-6 |
|
Absorption Coefficients |
<0.1%/cm at 1064nm <1%/cm at 532nm |
|
Angle Acceptance |
0.8mrad-cm (θ, Type I,1064 SHG) |
|
1.27mrad-cm (θ, Type II,1064 SHG) |
|
Temperature Acceptance |
55℃-cm |
|
Spectral Acceptance |
1.1nm-cm |
|
Walk-off Angle |
2.7° (Type I 1064 SHG) |
|
3.2° (Type II 1064 SHG) |
|
NLO Coefficients |
deff (I)=d31sinθ+(d11cosΦ-d22sin3Φ)cosθ |
|
deff (II)=(d11sin3Φ+d22cos3Φ)cos2θ |
|
Non-vanished NLO susceptibilities |
d11=5.8xd36(KDP) |
|
d31=0.05xd11 |
|
d22<0.05xd11 |
|
Sellmeier Equations(λ in μm ) |
no2=2.7359+0.01878 / (λ2-0.01822) -0.01354 λ2 |
|
ne2=2.3753+0.01224 / (λ2-0.01667) -0.01516 λ2 |
|
Electro-optic coefficients: |
r22=2.7pm/V |
|
Half-wave voltage: |
7KV (at 1064nm,3*3*20mm3) |
|
Resistivity: |
>1011 ohm-cm |
|
Relative Dielectric Constant: |
εs11/εo:6.7 |
|
εs33/εo:8.1 |
|
Tan δ<0.001 |
Specifications
|
Dimension tolerance: |
±0.1mm |
|
Flatness: |
l/8 @633nm |
|
Surface quality: Scratch/Dig |
10/5 |
|
Parallelism: |
better than 20 arc sec. |
|
Perpendicularity: |
better than 15 arc min |
|
Angle tolerance: |
< +/-0.5° |
|
AR coating: |
P-coating, AR or BBAR coatings |
|
Residual reflectivity: |
R1064<0.2% ,R532<0.5%,R355<0.5%,R266<0.5% |
|
Clear aperture: |
>90% central area |
|
Transmitting wavefront distortion: |
less than l/8 @ 633nm |
Standard products
|
Part No |
Sizes |
Application |
Coating |
|
BOH4407 |
4*4*7mm |
S/T/FHG@1064nm, |
AR/AR |
|
BOS8407 |
8*4*7mm |
SHG for Dye laser |
P-Coating |
|
BOS5501 |
5*5*1mm |
SHG@800nm |
P-Coating |
|
BOS5500 |
5*5*0.5mm |
SHG@800nm |
p-Coating |
|
BOO4415 |
4*4*12mm |
OPO |
AR/AR |
|
