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BBO Crytsal

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.

Parameter

Specs

Angle tolerance:

Δθ< ± 0.5°; Δφ< ±0.5°

Dimensional Tolerance:

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

Flatness:

<L/8 at 633nm                

Surface Quality(S/D):

10/5 before coating,  20/10 after coated

Parallelism:

< 20 arc seconds

Perpendicularity:

< 5 arc minutes

Wavefront Distortion:

<L/8 at 632.8nm                

Clear Aperture:

Central 95%

Bevel (leg width):

<0.15mm x 45degree                

Coating:

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

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

Mount:

Black Anodized Aluminium


 Properties of BBO Crystal:

Crystal Structure

trigonal, space group R3c

Cell Parameters

a = b = 12.5322Ä, c = 12.7172Ä, 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
at 1.064 mm
at 0.532 mm

5 GW/cm2 (10 ns);
10 GW/cm2 (1.3 ns)1 GW/cm2 (10 ns);
7 GW/cm2 (250 ps)

Transparency Range

189 - 3500 nm

Refractive Indices
at 1.0642 mm
at 0.5321 mm
at 0.2660 mm

ne = 1.5425, no = 1.6551
ne = 1.5555, no = 1.6749
ne = 1.6146, no = 1.7571

Therm-Optic Coefficients

dno/dT = - 9.3 x 10-6/℃
dne/dT = -16.6 x 10-6/℃


 Sellmeier Equations:

no2(λ) = 2.7359+0.01878/(λ2-0.01822)-0.01354 λ2

 

ne2(λ) = 2.3753+0.01224/(λ2-0.01667)-0.01516 λ2

 

BBO optical properties

 

Transparence range

 189-3500nm

Second harmonic generation (SHG) range

 410-2400nm

Type I phase matching plane

 X-Z plane, φ=0°

Type I phase matching plane

 X-Z plane, φ=30°


 The crystals with different angle cut for various applications are listed as follows:
 1) Harmonic generations of Nd:YAG lasers:

1064nm SHG --> 532nm

 4x4x7mm Type I , θ=22.8°, φ=0°;

1064nm THG --> 355nm

 4x4x7mm Type I, θ=31.3°, φ=0°; Type II q=38.6°, φ=30°

1064nm 4HG --> 266nm

 4x4x7mm Type I, θ=47.6°, φ=0°;

1064nm 5HG --> 213nm

 4x4x7mm Type I, θ=51.1°, φ=0°;

2) OPO and OPA pumped by harmonics of Nd

YAG lasers

532nm Pump --> 680-2600nm

 8x6x12mm Type I, θ=21°, φ=0°;

355nm Pump --> 410-2600nm

 8x6x12mm Type I, θ=30°, φ=0°; Type II, q=37°, φ=30°;

266nm Pump --> 295-2600nm

 8x6x12mm Type I, θ=39°, φ=0°;

 

3) Frequency doubling of dye lasers

670-530nm SHG --> 335-260nm

 8x4x7mm Type I, θ=40°, φ=0°;

600-440nm SHG --> 300-220nm

 8x4x7mm Type I, θ=55°, φ=0°;

444-410nm SHG --> 222-205nm

 8x4x7mm Type I, θ=80°, φ=0°;

 

 4) Harmonic generations of Ti:Sapphire lasers

700-1000nm SHG --> 350-500nm

 5x5x0.2mm Type I, θ=28°, φ=0°;

700-1000nm THG --> 240-330nm

 5x5x0.2mm Type I, θ=42°, φ=0°;

700-1000nm FHG --> 210-240nm

 5x5x0.2mm Type I, θ=66°, φ=0°;


 5) Frequency doubling and tripling of alexandrite lasers

720-800nm SHG --> 360-400nm

 6x4x7mm Type I, θ=31°, φ=0°;

720-800nm THG --> 240-265nm

 6x4x7mm Type I, θ=48°, φ=0°;


 6) Intracavity SHG of Ar+ laser with brewster angle cut BBO Crystal

514nm SHG --> 257nm

 4x4x7mm Type I, θ=51°, φ=0°, B-cut;

488nm SHG --> 244nm

 4x4x7mm Type I, θ=55°, φ=0°, B-cut;


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

Part No.

Size(mm)

Type

θ

φ

Coating

BBO001

4x4x7

I

22.8°

AR/AR@1064&532nm

BBO002

4x4x7

I

47.6°

AR/AR@532&266nm

BBO003

4x4x10

I

22.8°

AR/AR@1064&532nm

BBO004

4x4x10

I

47.6°

AR/AR@532&266nm

BBO005

5x5x2

I

29.2°

AR/AR@800&400nm

BBO006

5x5x1

I

29.2°

AR/AR@800&400nm

BBO007

5x5x0.3-0.5

I

29.2°

AR/AR@800&400nm

BBO008

5x5x0.1

I

29.2°

AR/AR@800&400nm

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Inspection

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