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BBO
Affiliate classification
NLO Crystal
Product description
BBO (BetaBarium Borate or βBaB2O4)is an outstanding nonlinear optical crystal which has the obvious and unique advantages on frequency conversions of high peak power laser radiation from UV to VIS.
BBO is grown with the flux method. It is a negative uniaxial crystal, with ordinary refractiveindex (no) larger than extraordinary refractiveindex (ne). Both type I and type II phasematching can be reached by angletuning.
BBO is of particular importance in the visible and far UV. A wide variety of phasematching applications are possible,
BBO has susceptibility to moisture. The user is advised to provide dry conditions for both working and storage of BBO.
BBO is relatively soft and therefore requires precautions to protect its polished surfaces.
When angle adjusting is necessary, keep in mind that the acceptance angle of BBO is small.
Main Applications:
SHG, THG, 4HG, 5HG of Nd lasers
SHG, THG, 4HG of Ti:Al2O3 and Alexandrite lasers
SHG, THG and Frequencymixing of Dye lasers
SHG of Argon ion, Cuvapor and Ruby lasers
OPA and OPO
ElectroOptical application (Pockels Cell)
SHG and SFG
Because of a small acceptance angle and large walkoff, good laser beam quality (small divergence, good mode condition, etc.) is the key for BBO to obtain high conversion efficiency. Tight focus of laser beam is not recommended. BBO is the only NLO material which can be used to produce the fifth harmonic generation (5HG) of Nd:YAG lasers at 213 nm.
Relevant NLO properties for type I BBO crystal  
Fundamental wavelength: 1064nm  SHG  THG  FHG  5HG 
Effective NLO Coefficient (d36(KDP))  5.3  4.9  3.8  3.4 
Acceptance Angle (mradcm)  1.0  0.5  0.3  0.2 
Walkoff Angle (°)  3.2  4.1  4.9  5.5 
BBO is a negative uniaxial crystal with ordinary refractiveindex(no) larger than extraordinary refractiveindex(ne). Both type I and type II phasematching can be reached by angletuning. The phase matching angles of frequency doubling are shown in following figure.
Ultrafast Pulse (Ti:sapphire) Laser
Frequencydoubling and tripling of ultrashortpulse lasers are the applications in which BBO shows superior properties. As thin as 0.02mm BBO for this purpose is available.. A laser pulse as short as 10 fs can be efficiently frequencydoubled with a thin BBO, in terms of both phasevelocity and groupvelocity matching.
BBO's OPO and OPA
The OPO and OPA of BBO are powerful tools for generating a widely tunable coherent radiation from the UV to IR. The tuning angles of type I and type II BBO OPO and OPA are shown in following figure, respectively.
BBO——s EO Applications
BBO can also be used for EO applications. It has wide transmission range from UV to about 3500nm and it has much higher damage threshold than KD*P and LiNbO3. It has many advantages, including a very short pulse, good beam quality and compact size. Although it has a relative small electrooptic coefficient, the Halfwave voltage is high (7KV at 1064nm,3*3*20mm3), long and thin BBO can reduce the voltage requirements. CRYSTECH can supply 25mm long high quality BBO crystal with Zcut, ARcoated and Gold plated on the side faces.
Main Features:
Wide transmission region
Broad PM SHG range
Large effective SHG coefficient
High damage threshold
Wide temperaturebandwidth
High optical homogeneity
Dimension Tolerance  W(+/0.1)*H(+/0.1)*L(+0.5/0.1)mm  
Angle Tolerance  +/0.25°  Perpendicularity  ≤ 10’ 
Scratch/Dig  20/10  Chamfer  ≤ 0.2mm x 45° 
Parallelism  ≤10″  Chips  ≤ 0.1mm 
Flatness  λ/10@633nm  Clear Aperture  ≥ 90% 
Wavefront distortion  λ/8@633nm  
Coatings  C1 AR/AR@532(R<0.2%)&266(R<0.5%) C2 AR/AR@1064(R<0.2%)&532(R<0.5%)&355(R<0.5%) C3 Pcoating/Pcoating  
Damage Threshold  1GW/cm² (1064nm, 10ns, 10Hz) 
P/N

Cut Angle

Size(mm)

Coating

Application

BBOX447C1

Θ=47.7°φ=0°

4x4x7

AR/AR@532&266nm

SHG@532nm

BBOX557C1

Θ=47.7°φ=0°

5x5x7

AR/AR@532&266nm

SHG@532nm

BBOX667C1

Θ=47.7°φ=0°

6x6x7

AR/AR@532&266nm

SHG@532nm

BBOY447C2

Θ=31.3°φ=0°

4x4x7

AR/AR@1064&532&355nm

THG@1064nm

BBOY557C2

Θ=31.3°φ=0°

5x5x7

AR/AR@1064&532&355nm

THG@1064nm

BBOY667C2

Θ=31.3°φ=0°

6x6x7

AR/AR@1064&532&355nm

THG@1064nm

BBOZ55005C3

Θ=29.2°φ=0°

5x5x0.05

Pcoating/Pcoating

SHG@800nm

BBOZ5505C3

Θ=29.2°φ=0°

5x5x0.5

Pcoating/Pcoating

SHG@800nm

BBOZ551C3

Θ=29.2°φ=0°

5x5x1

Pcoating/Pcoating

SHG@800nm

BBOZ66005C3

Θ=29.2°φ=0°

6x6x0.05

Pcoating/Pcoating

SHG@800nm

BBOZ6605C3

Θ=29.2°φ=0°

6x6x0.5

Pcoating/Pcoating

SHG@800nm

BBOZ661C3

Θ=29.2°φ=0°

6x6x1

Pcoating/Pcoating

SHG@800nm

BBOZ1010005C3

Θ=29.2°φ=0°

10x10x0.05

Pcoating/Pcoating

SHG@800nm

BBOZ101005C3

Θ=29.2°φ=0°

10x10x0.5

Pcoating/Pcoating

SHG@800nm

BBOZ10101C3

Θ=29.2°φ=0°

10x10x1

Pcoating/Pcoating

SHG@800nm

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  11=4x106/K; 33=36x106/K 
Optical Properties:
Transparency Range:  1903500nm 
SHG Phase Matchable Range  409.63500nm(Type I) 5253500nm(Type II) 
thermoptic Coefficients(/℃)  dno/dT=16.6x106 dne/dT=9.3x106 
Absorption Coefficients  <0.1%/cm at 1064nm <1%/cm at 532nm 
Angle Acceptance 
0.8mradcm (θ, Type I,1064 SHG) 1.27mradcm (θ, Type II,1064 SHG) 
Temperature Acceptance  55℃cm 
Spectral Acceptance  1.1nmcm 
Walkoff Angle 
2.7° (Type I 1064 SHG) 3.2° (Type II 1064 SHG) 
NLO Coefficients 
deff (I)=d31sinθ+(d11cosΦd22sin3Φ)cosθ deff (II)=(d11sin3Φ+d22cos3Φ)cos2θ 
Nonvanished NLO susceptibilities 
d11=5.8xd36(KDP) d31=0.05xd11 d22<0.05xd11 
sellmeier Equations(λ in μm ) 
no2=2.7359+0.01878 / (λ20.01822) 0.01354 λ2 ne2=2.3753+0.01224 / (λ20.01667) 0.01516 λ2 
Electrooptic coefficients:  r22=2.7pm/V 
Halfwave voltage:  7KV (at 1064nm,3*3*20mm3) 
Resistivity:  >1011 ohmcm 
Relative Dielectric Constant: 
εs11/εo:6.7 εs33/εo:8.1 Tan δ<0.001 