Descriptions:
HGO grows BBO Nonlinear crystals . BBO crystal transparency ranges from
188 nm to 5,2 µm, its phase-matchable
range spans almost over the entire transparency range. BBO crystals have the
highest nonlinearity in the UV range out of all common nonlinear crystals.
lMain
applications:
1） Harmonic
generation (up to fifth) of pulsed Nd-doped crystal-based lasers.
2） Frequency
doubling, a tripling of pulsed Ti:sapphire, Yb-doped, dye lasers.
3） Characterization
of ultrashort laser pulses by FROG, XFROG, SPIDER, dispersion scan, chirp scan methods.
4） OPA and OPO.
5） Pockels' Cell
Advantages:
1) Broad phase
match range from 409.6 nm to 3500 nm;
2) Wide
transmission region from 190 nm to 3500 nm;
3) Large
effective second-harmonic-generation (SHG) coefficient;
4) High damage
threshold;
5) High
optical homogeneity with δn ≈10-6/cm;
6) Wide
temperature-bandwidth of about 55℃.
Optical and
Nonlinear properties of BBO crystal
|
Transparency Range
|
190-3500nm
|
|
SHG Phase Matchable Range
|
409.6-3500nm (Type
I) 525-3500nm (Type II)
|
|
Therm-optic Coefficient (/℃, λ in μm)
|
dno/dT=-16.6x 10-6/℃
dne/dT=-9.3x 10-6/℃
|
|
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+(d11cos3Φ- d22 sin3Φ) cosθq
deff (II)= (d11 sin3Φ + d22 cos3Φ) cos2θ
|
|
Non-vanished NLO susceptibilities
|
d11 = 5.8 x d36(KDP)
d31 = 0.05 x d11
d22 < 0.05 x d11
|
|
Sellmeier Equations (λ in μm)
|
no2=2.7359+0.01878/(λ2-0.01822)-0.01354λ2
ne2=2.3753+0.01224/(λ2-0.01667)-0.01516λ2
|
|
Electro-optic coefficients
|
γ22 = 2.7 pm/V
|
|
Half-wave voltage
|
7 KV (at 1064 nm,3x3x20mm3)
|
|
Resistivity
|
>1011 ohm·cm
|
|
Relative Dielectric Constant
|
εs11 / εo : 6.7
εs33 / εo : 8.1
Tanδ<0.001< span="">
|
Physical
properties of BBO crystal
|
Crystal Structure
|
Trigonal，Space Group R3c
|
|
Lattice Parameter
|
a=b=12.532Å,c=12.717Å,Z=6
|
|
Melting Point
|
About 1095℃
|
|
Mohs Hardness
|
4
|
|
Density
|
3.85 g/cm3
|
|
Refractive indices
|
no = 1,6551; ne = 1,5426
|
|
Thermal Conductivity
|
⊥c: 1.2W/m/K; //c: 1.6W/m/K
|
|
Thermal Expansion Coefficients
|
α11=4 x 10-6/K; α33=36x 10-6/K
|
HGO offers BBO specifications:
|
Tolerance of cutting angle
|
△θ≤±0.25°,△φ≤±0.25°
|
|
Tolerance of dimension
|
Dimension+0/-0.1 mm，L：±0.1mm
|
|
Flatness
|
λ/10 @ 632.8nm
|
|
Wavefront distortion
|
λ/8@ 632.8nm
|
|
Surface quality
|
10/5 per MIL-O-13830A
|
|
Parallelism
|
20″
|
|
Perpendicularity
|
5′
|
|
Clear Aperture:
|
> 90%
|
|
Chamfer:
|
< 0.1 mm @ 45°
|
|
Size
|
Upon customer request
|
|
Coating
|
AR/PR coating upon customer’s request
|
|
Damage Threshold
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750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz
|
|
Quality Warranty Period
|
One
year under proper use
|
Why
Choose HGO ?
HGO grows BBO
crystals(Beta-Barium Borate Crystal) in house using Flux growth technology.
High quality of starting material is used for crystal growth and strict quality
control is applied to our BBO’s absorption ,scattering loss, bulk
loss ,wavefront distortion ,inclusions and all the other required processing
specs which assures that each crystal from HGO will comply with will comply
with customer’s specification and perform well in
laser system.
HGO can supply
size of BBO up to 15mm*15mm*15mm and length from 0.05mm up to 25mm. We have
over 13 years crystals growth experiences and HGO’s BBO has been well recognized for its
high quality and low price by our customers from all over the world.
