磷酸二氢钾(KDP)，磷酸二氘钾(DKDP)，被广泛地应用在多种工业用途。这两种晶体通常被用于做Nd:YAG激光器的二、三、四倍频器件（室温条件下）。此外，它们也是优良的电光晶体，具有很高的电光系数，广泛应用于电光调制器、Q开关、普克尔斯盒等。
Potassium Dihydrogen Phosphate(KDP)and Potassium Deuterium Phosphate(KD*P)are among the most widely-used commercial NLO materials.They are commonly used for doubling,tripling and quadrupling of Nd:YAG laser at the room temperature. In addition, they are also excellent electro-optic crystals with high electro-optic coefficients, widely used as electro- optical modulators, Q-switches, and Pockels Cells,etc.
