Welcome to Crystech, your trusted provider of high-quality optical crystals. One of our flagship products is the BBO (β-BaB2O4), a beta-barium borate crystal renowned for its exceptional optical properties. Grown using the flux method, BBO is a negative uniaxial crystal with a unique refractive index characteristic, where the ordinary refractive index (no) is larger than the extraordinary refractive index (ne). This distinctive feature allows for both Type I and Type II phase-matching through angle-tuning, making BBO particularly significant in the visible and far UV range.

Our BBO crystals are meticulously engineered to meet the highest standards of optical performance. With a broad phase-matchable range from 409.6 nm to 3500 nm, and a wide transmission region spanning 190 nm to 3500 nm, BBO crystals are versatile and adaptable for various optical applications. Additionally, they boast a high damage threshold and superior optical homogeneity, ensuring reliable performance in demanding environments.

At Crystech, we take pride in the physical and optical properties of our BBO crystals. These crystals have a trigonal crystal structure with space group R3c, and lattice parameters of a = b = 12.532 Å, c = 12.717 Å, with Z = 6. They have a melting point of approximately 1095°C, a Mohs hardness of 4, and a density of 3.85 g/cm3. Furthermore, the thermal conductivity coefficients are ⊥c: 1.2 W/m/K and //c: 1.6 W/m/K, while the thermal expansion coefficients are α11 = 4x10-6/K and α33 = 36x10-6/K.

Our BBO crystals are processed with precision to ensure optimal performance. They have size tolerances of W±0.1mm × H±0.1mm × L+0.5/-0.1mm (L≥2.5mm), a clear aperture of ≥90%, and a surface quality of 10/5 according to MIL-PRF-13830B. The flatness is ≤λ/10@633nm, wavefront distortion is ≤λ/8@633nm, and parallelism is 10". The perpendicularity is ≤10', angle tolerance is ≤0.25°, and chamfer is ≤0.2mm@45°. Additionally, they have a laser-induced damage threshold (LIDT) of >1GW/cm²@1064nm, 10ns, 10Hz with AR coating.