NLO Crystals

/BBO Nonlinear crystal Beta-Barium Borate Crystal

BBO Nonlinear crystal Beta-Barium Borate Crystal

HGO grows BBO Nonlinear crystals using flux technology. BBO crystal transparency ranges from 188 nm to 5,2 µm, which includes reasonable transparency from 3-5,2 µm for few tens µm thick crystals, while their phase-matchable range spans almost over the entire transparency range. Combined with other magnificent properties of BBO, it is favorable for numerous nonlinear parametric applications. It is worth to mention that BBO crystals have the highest nonlinearity in the UV range out of all common nonlinear crystals.

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  • Shipping Port:

    Fuzhou, China
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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


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


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


Spectral Acceptance


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)


Electro-optic coefficients

γ22 = 2.7 pm/V

Half-wave voltage

7 KV (at 1064 nm,3x3x20mm3)


>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

TrigonalSpace Group R3c

Lattice Parameter


Melting Point

About 1095

Mohs Hardness



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


Tolerance of dimension

Dimension+0/-0.1 mmL±0.1mm


λ/10 @ 632.8nm

Wavefront distortion

λ/8@ 632.8nm

Surface quality

10/5 per MIL-O-13830A





Clear Aperture:

> 90%


< 0.1 mm @ 45°


Upon customer request


AR/PR coating upon customer’s request

Damage Threshold

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.

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