BIBO - BiB3O6 Crystal
BiB3O6 (BIBO) crystal is a new type of nonlinear laser crystal, which has the advantages of wide transparency range (from 286nm to 2500nm), high damage threshold, large nonlinear coefficient and non-wetting. At present, as a kind of excellent nonlinear second harmonic crystal, it can be used to produce high efficiency crystal of green or blue laser.
Compared with other nonlinear crystals used for the second harmonic (SHG), BIBO crystals have many advantages.
Since the second harmonic (SHG) can be widely used to generate coherent visible light and ultraviolet radiation, people pay attention to it, but the traditional nonlinear crystals such as KDP, LBO, KTP, B-BBO also have many shortcomings. BIBO crystal is a new type of nonlinear crystal. Compared with KDP crystal, it makes up for the disadvantage that KDP crystal can grow in large size but dissolve in water. Although the nonlinear coefficient of KTP crystal is large, the laser damage threshold is low, which will cause problems such as refractive index change and transmission loss. BIBO crystal has higher laser damage threshold and higher second harmonic conversion efficiency. Although LBO and B-BBO are the most practical, they are small in size and have certain hygroscopicity, while BIBO crystals are non-wet and can grow to large size. These advantages enable BIBO crystals to be widely used.
Parameter
| Chemical Formula | BiB3O6 |
| Crystal Structure | Monoclinic, point group 2 |
| lattice Parameters | a = 7.116 Ä, b = 4.993Ä, |
| c = 6.508Ä, Z = 105.62° | |
| Melting Point | 726°C |
| Specific Heat | 0.5 J/g-K at 330 K |
| Mohs Hardness | 5 – 5.5 |
| Density | 5.033 g/cm3 |
| Thermal Expansion Coefficients | //a, 4.8 x 10-5/K , //b, 4.4 x 10-6/K, |
| //c, -2.69 x 10-5/K |
| NLO coefficients (pm/V） | d11 = 2.53, d12 = d14 = 2.3 |
| d13 = -1.3,d25 = d36 = 2.4 | |
| d26 = 2.8, d35= -0.9 | |
| Phase matching angle | 168.9° from z axis in YZ plane |
| Deff（Pm/V） | 3.0+/-0.1 |
| Angular acceptance（arad-cm） | 2.32 |
| Walk-off angle(°) | 25.6 |
| temperature acceptance(℃·cm) | 2.17 |
| Transparency Range | 286-2500nm |
| Absorption Coefficient | <0.1%/cm at 1064nm |
| Sellmeier coefficients: | n1: A=3.6545 B=0.0511 C=0.0371 D=0.0226 |
| ni2(λ)=A+B/(λ2-C)-Dλ2 | n2: A=3.0740 B=0.0323 C=0.0316 D=0.01337 |
| (λ in um) | n3: A=3.1685 B=0.0373 C=0.0346 D=0.01750 |
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| BIBO Corresponding magnitude of effective nonlinear coefficient for type-I SHG as a function of the fundamental wavelength | BIBO-Phase-matching angle for type I SHG as a function of the fundamental wavelength |
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| BIBO-Transmittance spectrum | Intracavity SHG power as a function of incident pump power for BIBO crystal |
Feature
- Broad transparency range from 286nm to 2500nm
- High optical homogeneity (dn»10-6/cm) and being free of inclusion
- Large effective SHG coefficient (about 9 times that of KDP)
- High damage threshold
- Wide temperature-bandwidth
- Inertness with respect to moisture
Application
- SHG and THG for middle and high power Nd: lasers at 1064nm
- SHG and THG of high power Nd: lasers at 1342nm & 1319nm for red and blue laser
- SHG for the Nd: Lasers at 914nm & 946nm for blue laser
- Optical Parametric Amplifiers (OPA) and Oscillators (OPO) application
Reference
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| [29] F.-f.Chen,F.-p.Yu,W.-y.Bai,L.Xiong,G.J.Diebold and X.Zhao, “High Performance Piezoelectric Crystal Alpha-Bibo for Photoacoustic Gas Detection,” 2019 13th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA), Harbin, China, 2019,pp.1-4, doi: 10.1109/SPAWDA.2019.8681840. |
| [30] J. Kroupa , D. Kasprowicz , A. Majchrowski , E. Michalski & M. Drozdowski,Optical Properties of Bismuth Triborate (BIBO) Single Crystals,Ferroelectrics,Volume 318,2005-Issue 1,Published Online: 09 Mar 2011 |
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