BBO


 BBO (beta-BaB 2 O 4 ) is a nonlinear optical crystal with combination of number of unique features. Wide transparency and phase matching ranges, large nonlinear coefficient, high damage threshold and excellent optical homogeneity provide attractive possibilities for various nonlinear optical online_orderings.

 Capabilities: 


1) Aperture: 1x1 ~ 12x12mm 
2) Length: 0.02 ~ 25mm 
3) Phase matching angle θ and φ: Determined by different kinds of homonic generartion. 
4) Phase matching type: Type I or Type II 
5) End configuration: Flat or Brewster or Specified 
 
Typical Specification and Tolerance: 
1) Angle tolerance: Δθ< ± 0.2°; Δφ< ±0.2° 
2) Dimension tolerance: (W ± 0.1mm) x (H ± 0.1mm) x (L + 0.2mm/-0.1mm) 
3) Flatness: <λ /8 @ 633nm 
4) Scratch/Dig code:better than 10/5 Scracth/dig per MIL-O-13830A 
5) Parallelism: < 20 arc seconds 
6) Perpendicularity: <5 arc minutes 
7) Wavefront distortion: <λ/8 @ 633nm 
8) Clear aperture: > 90% central area 
9) Coating:Protective Coating or Anti-Reflection 
Physical and Optical Properties
Crystal Structure trigonal,space group R3c
Cell Parameters A=b=12.532Å,c=12.717Å,Z=6
Melting Point 1095+/-5°C
Transition Temperature 925+/-5 °C
Optical Homogeneity Δn  10  /cm
Mohs Hardness 4.5
Density 3.85 g/cm
Absorption Coefficient <0.1%/cm  (at 1064nm)
Hygroscopic Susceptibility low
Resistivity >10   ohm-cm
Relative Dielectric Constant ε  11/ε0:6.7, ε  33/ε0:8.1
Tanδ < 0.001
Thermal Expansion Coefficients a,   4x10  /K
(in the range of 25°C-900°C c,   36x10   /K
Thermal Conductivity    ⊥c, 1.2 W/m/K ;    ||c,   1.6W/m/K

 

 

As a result of large thermal acceptance bandwidth, high damage threshold and small absorption BBO well suits for frequency conversion of high peak or average power laser radiation.The large spectral transmission range as well as phase matchability, especially in UV range, makes BBO perfectly suitable for frequency doubling of Dye, Ar+-ion and Copper vapour laser radiation, effective cascade harmonic generation of wide spread Nd:YAG as well as of Ti:Sapphire and Alexandrite laser radiation. Both angle tuned Type 1 (oo-e) and Type 2 (eo-e) of phase matching can be obtained increasing a number of advantages for different online_orderings.SHG phase matching angle dependence on input radiation wavelength is shown in Fig. 1.

Both Type 1 and Type 2 phase matching are used in OPO devices based on BBO crystals and designed for pump at different harmonics (up to fifth) of Nd:YAG lasers. Type 1 of interaction gives a larger tuning range and higher parametric amplification rate comparing to type 2 of interaction, while using type 2 interaction you are obtaining narrower bandwidth of output as shown in Fig.2. Parametric gain in BBO is about10 times higher then in KDP in case of 355 nm pump for type 1 interaction. Up to 30% energy conversion efficiency has been obtained using BBO crystal of 12 mm length in OPO device synchronously pumped at 532 nm, which outputs at 640-3170 nm. Because of small acceptance angle and?large walk off, the use of input laser radiation with good beam quality and low divergence is required for efficient conversion.

Standard BBo for SHG
Part No.
Size(mm)
q
f
Coating
BBO001
4x4x7
22.8°
AR/AR@1064&532nm
BBO002
4x4x7
47.6°
AR/AR@532&266nm
BBO003
4x4x10
22.8°
AR/AR@1064&532nm
BBO004
4x4x10
47.6°
AR/AR@532&266nm
BBO005
5x5x2
29.2°
AR/AR@800&400nm
BBO006
5x5x1
29.2°
AR/AR@800&400nm
BBO007
5x5x0.3-0.5
29.2°
AR/AR@800&400nm
BBO008
5x5x0.1
29.2°
AR/AR@800&400nm

 


 

 

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