Compared with the traditional KD*P electro-optic modulation crystals, BBO (β-BaB2O4) crystal has the advantages of low absorption coefficient, weak piezoelectric ringing effect, and a wider spectral transmission range (210-2000nm). Compared with RTP electro-optic crystals, BBO crystals have higher extinction ratio, damage threshold and temperature coefficient of refractive index, which are beneficial to improving the stability of laser output power. Therefore, the electro- Q-switches made of BBO crystals are often used in high repetition frequency (up to 800KHz), high power (up to 900) electro-optic Q-switched lasers, cavity-dumped Q-switched lasers and all-solid-state picosecond, femtosecond regenerative amplification systems.
Parameter indicators:
| Aperture | Max. φ 12mm, Min. φ 2mm |
| Size tolerance | ± 0.mm |
| Parallelism | ≤20 arc seconds |
| Perpendicularity | ≤5 arc minutes |
| Surface finish | 20-10 |
| Flatness | λ/10 @ 633 nm |
| Angle tolerance | Δθ ≤0.25°, Δφ ≤0.25° |
| amfer | ≤0.2mmx45° |
| Crack | ≤0.1mm |
| Damage threshold | > 800MW/cm at 10Hz |
| Wavelength range | 200-2000nm |
| Extinction ratio | >2000:1 |
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