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  • Products Name: BBO Nonlinear Crystals
  • Products Number: J007
  • Published: 2017-03-08
  • Inventory:
  • Views : 5

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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.


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

Phase-Matchable SHG Range

NLO Coefficients       d11=5.8 x d36(KDP)
d31=0.05 x d11,  d22 < 0.05 xd11
Electro-Optic Coefficients  γ11=2.7 pm/V ,   γ22,γ31 < 0.1γ11
Half-Wave Voltage  48 KV (at 1064 nm)
Damage Threshold   
at 1.064 μm  5 GW/cm  (10 ns);   10 GW/cm   (1.3ns)
at 0.532 μm  1 GW/cm  (10 ns);   7 GW/cm   (250ps)
Transparency Range  189-3500 nm
Refractive Indices   
at 1.0642 μm  ne=1.5425,   no=1.6551
at 0.5321 μm  ne=1.5555,   no=1.6749
at 0.2660 μm  ne=1.6146,   no=1.7571
Therm-Optic Coefficients   dno/dT=-9.3 x 10  /°C
dne/dT=-16.6 x 10  /°C
Sellmeier Equations  no 2(λ)=2.7359 + 0.01878/(λ  -0.01822)-0.01354λ
ne2  (λ)=2.3753 + 0.01224/(λ  -0.01667)-0.01516λ


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/[email protected]&532nm
BBO002 4x4x7 47.6° AR/[email protected]&266nm
BBO003 4x4x10 22.8° AR/[email protected]&532nm
BBO004 4x4x10 47.6° AR/[email protected]&266nm
BBO005 5x5x2 29.2° AR/[email protected]&400nm
BBO006 5x5x1 29.2° AR/[email protected]&400nm
BBO007 5x5x0.3-0.5 29.2° AR/[email protected]&400nm
BBO008 5x5x0.1 29.2° AR/[email protected]&400nm



In order to prevent crystals from damaging or to be easily operated, FOCtek provide four kinds of mount of holder to install different dimension crystals. Please contact our sales for more information.


Part No. F C(mm) T(mm) Crystal Aperture (mm) Crystal Length (mm) Unit Price
BH2001 25.4 5.0 4x4-10x10 0.1-2 $10.0
BH2002 25.4 9.5 4x4-10x10 4-10 $10.0
BH2003 25.4 9.5 8x8-10x10 3-6 $10.0
BH2004 25.4 13.5 4x4-10x10 6-10 $10.0







1.To inquiry or order a finished BBO crystals, please specify the specifications listed above. For the nonlinear crystals, the maximum conversion efficiency is mostly determined by three specification crystals length, phase matching type, and phase matching angles(θand φ). 
2.For information related to the handling and mark of BBO Crystals.