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The BBO Crystal is an efficient NLO crystal for the second, third and fourth harmonic generation of Nd:YAG lasers, and the best NLO crystal for the fifth harmonic generation at 213 nm. Conversion efficiencies of more than 70% for SHG, 60% for THG and 50% for 4HG, and 200 mW output at 213 nm (5HG) have been obtained, respectively. BBO Crystal has the following.
Advantages of BBO Crystal
Broad phase-matching range from 409.6 nm to 3500 nm
Wide optical transmission from 190 nm to 3500 nm
Large effective second-harmonic-generation (SHG) coefficient
High damage threshold of 10 GW/cm2 for 100 ps pulse-width at 1064 nm
Wide temperature-bandwidth of about 55℃
Good mechinical and physical properties


                   

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20 years experience
                   
                   

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High quality
                   
                   

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Competitive price
                   
                   

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7days delivery
                   
                   

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Japanese coating machine.
                   



PRODUCT PARAMETERS


Specifications of BBO Crystal


Angle tolerance:

Δθ< ± 0.5°; Δφ< ±0.5°

Dimensional Tolerance:

(W ± 0.1mm) x (H ± 0.1mm) x (L + 0.2mm/-0.1mm)

Flatness:

<λ/8 at 633nm

Surface Quality:

10/5 S/D

Parallelism:

< 20 arc seconds

Perpendicularity:

< 5 arc minutes

Wavefront Distortion:

<λ/8 at 632.8nm

Clear Aperture:

Central 95%

Chamfer:

0.15x45°

Coating:

* Protective coating is required to prevent polished surfaces from fogging.

* Anti-reflective coating should be considered if low reflectivity is required.



Properties of BBO Crystal:

Crystal Structure

trigonal, space group R3c

Cell Parameters

a = b = 12.532Ä, c = 12.717Ä, Z = 6

Melting Point

1095 +/-5°C

Transition Temperature

925 +/-5°C

Optical Homogeneity

Dn ≈10-6/cm

Mohs Hardness

4.5

Density

3.85 g/cm3

Absorption Coefficient

< 0.1%/cm (at 1064 nm)

Hygroscopic Susceptibility

low

Resistivity

> 1011 ohm-cm

Relative Dielectric Constant

εT11/ε0: 6.7, εT33/ε0: 8.1 

Tan δ, < 0.001

Thermal Expansion Coefficients(in the range of 25℃- 900℃)

a, 4 x 10-6/K 

c, 36 x 10-6/K

Thermal Conductivity

^c, 1.2 W/m/K; ||c, 1.6 W/m/K



Phase-matchable SHG range

205nm-1750nm

NLO coefficients

d11 = 5.8 x d36(KDP)

d11 = 0.05 x d11, d22< 0.05 x d11

Electro-Optic Coefficients

g11 = 2.7 pm/V, g22, g31< 0.1 g11

Half-Wave Voltage

48 KV (at 1064 nm)

Damage Threshold

5 GW/cm2 (10 ns); 

at 1.064 mm 

10 GW/cm2 (1.3 ns)1 GW/cm2 (10 ns);

at 0.532 mm

7 GW/cm2 (250 ps)

Transparency Range

189 - 3500 nm

Refractive Indices 


at 1.0642 mm 

ne = 1.5425, no = 1.6551

at 0.5321 mm 

ne = 1.5555, no = 1.6749

at 0.2660 mm

ne = 1.6146, no = 1.7571

Therm-Optic Coefficients

dno/dT = - 9.3 x 10-6/℃

dne/dT = -16.6 x 10-6/℃


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