KTiOPO4 (KTP) is an excellent nonlinear optical material and has been extensively used in frequency doubling of IR lasers. . It has high nonlinear coefficient and stable physical property. Its most popular application is as a frequency doubler utilizing the 1064nm output of a Nd:YAG laser and to generate 532nm laser. KTP’s properties also make it superior for electro-optic modulation, optical parametric generation.