Structural and Physical Properties
| Crystal Structure | Trigonal, space group R |
| Cell Parameters | a = b = 12.532 Å, c = 12.717Å, Z = 6 |
| Melting point | 1095+ 5°C |
| Transition temperature | 925+ |
| Optical homogeneity | dn » 10-6/cm |
| Mohs hardness | 4 |
| Density | 3.85 g/cm3 |
| Absorption coefficient | < 0.1%/cm (at 1064nm) |
| Specific heat | 1.91J/cm3xK |
| Hygroscopic susceptibility | Low |
| Thermal expansion coefficients | 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 |
Linear Optical Properties
| Transparency range | |
| Sellmeier equations ( l in m m) | no2 =2.7359+0.01878/( l 2 -0.01822)-0.01354l2 ne2 =2.3753+0.01224/( l 2 -0.01667)-0.01516l2 |
| Refractive indices at 1064 nm at 532 nm at 266 nm |
ne = 1.5425, no = 1.6551 ne = 1.5555, no = 1.6749 ne = 1.6146, no = 1.7571 |
| Therm-optic coefficients | dne/dT = -16.6 x 10-6/ã¡C |
Nonlinear Optical Properties
| Phase-matchable output wavelengths | |
| NLO coefficients | d11 = 5.8 x d36(KDP) d31 = 0.05 x d11 d22 < 0.05 x d11 |
| Effective nonlinearity expressions | dooe= d31 sinq +(d11 cos3f - d22 sin3f) cosq deoe= (d11 sin3f + d22 cos3f) cos2q |
| Electro-optic coefficients | |
| Half-wave voltage | 48 KV (at 1064 nm) |
| Damage threshold at 1064nm at 532nm |
5 GW/cm2 (10 ns); 10 GW/cm2 (1.3 ns) 1 GW/cm2 (10 ns); 7 GW/cm2 (250 ps) |
Application
BBO is of particular importance in the visible and far UV. A wide variety of phase-matching applications are possible, including the following: Second, third, fourth and fifth harmonic generation of Nd doping lasers Second harmonic generation to generate wavelengths as short as 204.8nm Shorter wavelengths (193nm) can be generated by sum frequency mixing Second, third and fourth harmonic generation of Ti:Sapphire lasers Optical parametric amplifier (OPA) and optical parametric oscillators (OPO) Frequency-doubling of Argon ion, Cu-vapor and Ruby lasers Transverse field Pockel cells made from BBO useful when high average powers or short wavelengths used |
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| SHG and SFG Because of a small acceptance angle and large walk-off, good laser beam quality (small divergence, good mode condition, etc.) is the key for BBO to obtain high conversion efficiency. Tight focus of laser beam is not recommended. BBO is the only NLO material which can be used to produce the fifth harmonic generation (5HG) of Nd:YAG lasers at 213 nm. |
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| Ultrafast Pulse (Ti:sapphire) Laser Frequency-doubling and -tripling of ultrashort-pulse lasers are the applications in which BBO shows superior properties to KDP and ADP crystals. As thin as 0.02mm BBO for this purpose is available.. A laser pulse as short as 10 fs can be efficiently frequency-doubled with a thin BBO, in terms of both phase-velocity and group-velocity matching. |
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| BBO's OPO and OPA The OPO and OPA of BBO are powerful tools for generating a widely tunable coherent radiation from the UV to IR. The tuning angles of type I and type II BBO OPO and OPA have been calculated, with the results shown in folowing, respectively. |
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BBO's Specifications
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Coatings
| 1.P-Coating: The protective dielectric coating protects the BBO polished surfaces from fogging due to ambient moisture. The protective coating also reduces reflection from the polished surface and improves transmission for all wavelengths that are used. |
| 2. Anti-reflective coatings (AR-coating): Single-band, dual-band AR-coating and broad-band AR Coating on BBO surface are available from CRYSTECH. |
Note
| 1. BBO has a low susceptibility to the moisture. The user is advised to provide dry conditions for both the use and preservation of BBO. |
| 2. BBO is relatively soft and therefore requires precautions to protect its polished surfaces. |
| 3. When angle adjusting is necessary, keep in mind that the acceptance angle of BBO is small. |
Standard Product
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