BBO 是一种非线性光学晶体，结合了许多独特的特性：宽透明区域、宽相位匹配范围、大非线性系数、高损伤阈值。
参数指标
| Flatness | 入/8 at 633 nm |
| Parallelism | < 20 arcsec |
| Surface quality | 10 - 5 scratch & dig (MIL-PRF-13830B) |
| Perpendicularity | < 5 arcmin |
| Angle tolerance | < 30 arcmin |
| Aperture tolerance | ± 0.1 mm |
| Clear aperture | 90% of full aperture |
