摘要
Nonlinear optical(NLO)crystals are core materials in laser frequency-conversion technique,and the requirement on the laser wavelength varies from one application to another.Now,the commercial NLO crystals,e.g.,KDP,LBO,BBO,KTP,AgGaS_(2),ZnGeP_(2),et al.,have prevailed in ultraviolet(UV)/visible and near-/mid-infrared region for decades.
