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- BBO（β相偏硼酸鋇晶體)
BBO（β相偏硼酸鋇晶體)
Advantages of BBO Crystals
- 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
Capabilities:
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Aperture:
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2x2 ~ 25x25mm
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Lenght:
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0.01 - 25mm
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Cutting Angle of BBO Crystals
And:
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Determined by different kinds of homonic generartion
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Phase matching type:
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Type I or Type II
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End Configuration:
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Plano/Plano or Brewst/Brewst or Specified
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Specifications of BBO Crystals
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Angle tolerance:
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Δθ< ± 0.5°; Δφ< ±0.5°
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Dimensional Tolerance:
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(W ± 0.1mm) x (H ± 0.1mm) x (L + 0.2mm/-0.1mm)
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Flatness:
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<λ/8 at 633nm
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Surface Quality:
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10/5 S/D
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Parallelism:
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< 20 arc seconds
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Perpendicularity:
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< 5 arc minutes
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Wavefront Distortion:
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<λ/8 at 632.8nm
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Clear Aperture:
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Central 95%
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Chamfer:
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0.15x45°
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Coating:
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* 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:
Sellmeier Equations:
no2(l) = 2.7359+0.01878/(l2-0.01822)-0.01354 l2
ne2(l) = 2.3753+0.01224/(l2-0.01667)-0.01516 l2
BBO optical properties:
Transparence range: 189-3500nm
Second harmonic generation (SHG) range: 410-2400nm
Type I phase matching plane: X-Z plane, f=0o
Type I phase matching plane: X-Z plane, f=30o
The c, , , , , rystals , , , , , , , with different angle cut for various applications are listed as follows:
1) Harmonic generations of Nd:YAG lasers:
1064nm SHG --> 532nm: 4x4x7mm Type I , q=22.8??, f=0o;
1064nm THG --> 355nm: 4x4x7mm Type I, q=31.3o, f=0o; Type II q=38.6o, f=30o
1064nm 4HG --> 266nm: 4x4x7mm Type I, q=47.6o, f=0o;
1064nm 5HG --> 213nm: 4x4x7mm Type I, q=51.1o, f=0o;
2) OPO and OPA pumped by harmonics of Nd:YAG lasers
532nm Pump --> 680-2600nm: 8x6x12mm Type I, q=21o, f=0o;
355nm Pump --> 410-2600nm: 8x6x12mm Type I, q=30o, f=0o; Type II, q=37o, f=30o;
266nm Pump --> 295-2600nm: 8x6x12mm Type I, q=39o, f=0o;
3) Frequency doubling of dye lasers
670-530nm SHG --> 335-260nm: 8x4x7mm Type I, q=40o, f=0o;
600-440nm SHG --> 300-220nm: 8x4x7mm Type I, q=55o, f=0o;
444-410nm SHG --> 222-205nm: 8x4x7mm Type I, q=80o, f=0o;
4) Harmonic generations of Ti:Sapphire lasers
700-1000nm SHG --> 350-500nm: 5x5x0.2mm Type I, q=28o, f=0o;
700-1000nm THG --> 240-330nm: 5x5x0.2mm Type I, q=42o, f=0o;
700-1000nm FHG --> 210-240nm: 5x5x0.2mm Type I, q=66o, f=0o;
5) Frequency doubling and tripling of alexandrite lasers
720-800nm SHG --> 360-400nm: 6x4x7mm Type I, q=31o, f=0o;
720-800nm THG --> 240-265nm: 6x4x7mm Type I, q=48o, f=0o;
6) Intracavity SHG of Ar+ laser with brewster angle cut BBO
514nm SHG --> 257nm: 4x4x7mm Type I, q=51o, f=0o, B-cut;
488nm SHG --> 244nm: 4x4x7mm Type I, q=55o, f=0o, B-cut;
Mounting: In order to prevent crystals from damaging or to be easily operated, MT-Optics provide three kinds of mount of holder to install different dimension crystals. Please contact our sales for more information.
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Part No.
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Size(mm)
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Type
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Θ
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Φ
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Coating
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BBO001
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4x4x7
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I
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22.8°
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0°
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AR/AR@1064&532nm
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BBO002
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4x4x7
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I
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47.6°
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0°
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AR/AR@532&266nm
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BBO003
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4x4x10
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I
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22.8°
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0°
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AR/AR@1064&532nm
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BBO004
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4x4x10
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I
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47.6°
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0°
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AR/AR@532&266nm
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BBO005
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5x5x2
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I
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29.2°
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0°
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AR/AR@800&400nm
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BBO006
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5x5x1
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I
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29.2°
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0°
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AR/AR@800&400nm
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BBO007
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5x5x0.3-0.5
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I
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29.2°
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0°
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AR/AR@800&400nm
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BBO008
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5x5x0.1
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I
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29.2°
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0°
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AR/AR@800&400nm
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Crystal Structure
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trigonal, space group R3c
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Cell Parameters
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a = b = 12.532?, c = 12.717?, Z = 6
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Melting Point
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1095 +/-5°C
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Transition Temperature
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925 +/-5°C
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Optical Homogeneity
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Dn≈10-6/cm
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Mohs Hardness
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4.5
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Density
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3.85 g/cm3
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Absorption Coefficient
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< 0.1%/cm (at 1064 nm)
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Hygroscopic Susceptibility
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low
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Resistivity
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> 1011 ohm-cm
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Relative Dielectric Constant
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T11/ 0: 6.7, T33/ 0: 8.1
Tan ?, < 0.001 |
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Thermal Expansion Coefficients(in the range of 25℃- 900℃)
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a, 4 x 10-6/K
c, 36 x 10-6/K |
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Thermal Conductivity
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^c, 1.2 W/m/K; ||c, 1.6 W/m/K
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Phase-matchable SHG range
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205nm-1750nm
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NLO coefficients
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d11 = 5.8 x d36(KDP)
d11 = 0.05 x d11, d22< 0.05 x d11 |
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Electro-Optic Coefficients
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g11 = 2.7 pm/V, g22, g31< 0.1 g11
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Half-Wave Voltage
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48 KV (at 1064 nm)
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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) |
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Transparency Range
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189 - 3500 nm
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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 |
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Therm-Optic Coefficients
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dno/dT = - 9.3 x 10-6/℃
dne/dT = -16.6 x 10-6/℃
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Note: Other sizes, cut angle, coating are available upon request.
