KD~*p晶体(磷酸二氘钾)属于四方晶系的阴离子单轴晶体。其点群42m,居里温度213K,密度2.238g/cm,莫氏硬度约2.5,无色透明。由于KD~*P在可见和近红外波段(0.3～1.5μm)有良好的透过性,具有较高的抗破坏阈值(达800MW/cm~2)能承受强光,且光学均匀性好,消光比高,半波电压低,因而不仅在光学仪器中,而且在激光技术中都有广泛的 KD ~ * p crystal (dideuterium potassium phosphate) belongs to the tetragonal anionic uniaxial crystal. The point group 42m, Curie temperature 213K, density 2.238g / cm, Mohs hardness of about 2.5, colorless and transparent. Since KD ~ * P has good permeability in the visible and near-infrared (0.3 ~ 1.5μm) bands, it has high anti-damage threshold (up to 800MW / cm ~ 2) and can withstand strong light with good optical uniformity. High extinction ratio, low half-wave voltage, and therefore not only in optical instruments, but also in laser technology has a wide range of