Rather, he needs super-sized, optically clear crystals of potassium dihydrogen phosphate, or KDP, which are useful as frequency doublers for lasers.

Potassium dihydrogen phosphate (KH 2 PO 4) is an inorganic salt with multiple uses. It is also known as monopotassium phosphate, potassium phosphate monobasic, potassium biphosphate, and potassium ...

Letter Published: 06 March 1954 Ferroelectric Structure of Potassium Dihydrogen Phosphate R. S. PEASE & G. E. BACON Nature 173, 443–444 (1954) Cite this article ...