NLO Crystals
  LBO
  BIBO
  KTP
  GTR-KTP
  RTP
  KTA
  BBO
Laser Crystals
Electro-optics crystals
Optical Components

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Beta-Barium Borate (β-BaB2O4,BBO) 
BBO is a negative uniaxial crystal, with ordinary refractive-index (no larger than extraordinary refractive-index (ne).Both type I and type II phase-matching can be reached by angle-tuning.
Properties

Crystal Structure

Trigonal, space group R3c

Lattices Parameters

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 Match Range

409.6-3500nm(Type I); 525-3500nm(Type II)

Thermal-optical Coefficients(/K)

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)-0.01516λ2

Electro-optic coefficients

r22=2.7pm/V

Half-wave voltage

7KV(at 1064nm,3x3x20mm3)

Resistivity

>1011ohm-cm

Relative Dielectric Constant

εs11/εo:6.7;εs33/εo:8.1; Tanδ<0.001

Applications

  • Second, third, fourth and fifth harmonic generation of Nd doping lasers;
  • Second harmonic generation to generate wavelengths as short as 204.8 nm
  • Shorter wavelengths (193nm) can be generated by sum frequency mixing
  • Frequency-doubling, -tripling and -mixing of Dye lasers;
  • Second, third and fourth harmonic generation of Ti:Sapphire lasers;
  • Optical parametric amplifier (OPA) and optical parametric oscillators (OPO);
  • Frequency-doubling of Argon ion, Cu-vapor and Ruby lasers.
  • Transverse field Pockel cells made from BBO useful when high average powers or short wavelengths used.

Specifications

  • Dimension tolerance:W±0.1mm)x(H±0.1mm)x(L+0.5/-0.1mm 
  • Clear aperture  :central 90% or the diameter  
  • No visible scattering paths or centers when inspected by a 50mW green Laser
  •  Flatness: less than λ/8 @ 633nm
  • Wave-front distortion: less than   λ/8 @ 633nm
  • Chamfer: ≤0.2mmx45°
  • Chip:  ≤0.1mm
  • Scratch/Dig code: better than 10/5 to MIL-PRF-13830B
  • Parallelism: ≤20 arc seconds
  • Perpendicularity:≤5 arc minutes
  • Angle tolerance:≤0.25°
  • Damage threshold[GW/cm2]:
    >1 for 1064nm,TEM00,10ns,10Hz  (polished  only),
    >0.5 for 1064nm,TEM00,10ns,10Hz(AR-coated) ;
    >0.3 for 532nm,TEM00,10ns,10Hz(AR-coated) 
  • Quality Warranty Period: one year under proper use.

Notes

  • BBO has a low susceptibility to the moisture. The user is advised to provide dry conditions for both the use and preservation 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.