Fabrication of KDP crystal prisms for second harmonic generation

Single KDP crystals were grown from an aqueous solution by the slow cooling method. They were cut into triangular prism-shaped blocks whose angles were determined by type II phase-matching condition for the second harmonic generation (SHG). The 1064 nm laser was shone into the KDP crystals and was partially converted to the 532 nm light. The power of remaining 1064 nm beam was much higher than that of 532 nm SHG beam. Total internal reflection occurred inside the KDP crystals for the 1064 nm beam. The 532 nm beam passed through the crystals and was recorded by a detector. The KDP crystal prisms have two functions: help to measure the output 532 nm radiation accurately, and adjust the power of 532 nm beam by changing the point of incidence of the 1064 nm beam, which improves convenience of the frequency doubler in optical devices.