BBO晶体是一种新型的紫外倍频晶体,具有较大的相位匹配范围以及较宽的透过波段,其倍频转换效率比较高,并具有很高的激光损伤阈值。应用:激光倍频、光参量放大、电光调Q等。由于BBO具有较低的潮解性,我们使用了一种有效的保护镀膜(P-coating)来防止晶体受潮。
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:
Aperture: | 2x2 ~ 25x25mm |
Lenght: | 0.01 - 25mm |
Cutting Angle of BBO Crystals And: | Determined by different kinds of homonic generartion |
Phase matching type: | Type I or Type II |
End Configuration: | Plano/Plano or Brewst/Brewst or Specified |
Specifications of BBO Crystals
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. |
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.
Part No. | Size(mm) | Type | Θ | Φ | Coating |
BBO001 | 4x4x7 | I | 22.8° | 0° | AR/AR@1064&532nm |
BBO002 | 4x4x7 | I | 47.6° | 0° | AR/AR@532&266nm |
BBO003 | 4x4x10 | I | 22.8° | 0° | AR/AR@1064&532nm |
BBO004 | 4x4x10 | I | 47.6° | 0° | AR/AR@532&266nm |
BBO005 | 5x5x2 | I | 29.2° | 0° | AR/AR@800&400nm |
BBO006 | 5x5x1 | I | 29.2° | 0° | AR/AR@800&400nm |
BBO007 | 5x5x0.3-0.5 | I | 29.2° | 0° | AR/AR@800&400nm |
BBO008 | 5x5x0.1 | I | 29.2° | 0° | AR/AR@800&400nm |
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 | T11/ 0: 6.7, T33/ 0: 8.1 |
Thermal Expansion Coefficients(in the range of 25℃- 900℃) | a, 4 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) |
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); |
Transparency Range | 189 - 3500 nm |
Refractive Indices |
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Therm-Optic Coefficients | dno/dT = - 9.3 x 10-6/℃ dne/dT = -16.6 x 10-6/℃ |