An investigation on the material removal mechanism of abrasive-free jet polishing for KDP crystal

摘要

Potassium dihydrogen phosphate (KDP) is the irreplaceable nonlinear single crystal as optical frequency conversion andelectro-optical switch in inertial confinement fusion (ICF) laser system. Based on the water solubility characteristics ofKDP crystal, we propose an abrasive-free jet polishing (AFJP) method for KDP crystal with the purpose of improvingsurface quality without the embedding of particles. According to the AFJP experimental results, the jet spot generated byAFJP is of an approximately Gaussian shape. The feasibility of this approach has been studied through spot experiments.And the material removal mechanisms can be divided into contact removal and slipping removal.