Feature KTP crystal is mostly used as nonlinear crystals for frequency doubling of solid-state Nd:YAG crystal or Nd:YVO4 crystal laser, as it has large nonlinear optical coefficients, wide angular bandwidth and small walk-off angle, broad temperature and spectral bandwidth. KTP crystal also has high electro-optic(E-O) coefficient and low dielectric constant, and large figure of merit, these features make it also widely used in electro-optic application. Specification Angle tolerance:A0< ± 0.5° ; A^< ±0.5° Dimensional Tolerance:(W ± 0.1mm) x (H ± 0.1mm) x (L + 0.2mm/-0.1mm) Flatness:<A/8 at 633nm Surface Quality:10/5 Scracth/Dig Parallelism:< 20 arc seconds Perpendicularity:< 5 arc minutes Wavefront Distortion:<A./8 at 632.8nm Clear Aperture:Central 95% Chamfer:0.15x45° Coating: a) * S1,S2: AR @ 1064 nm R<0.1% & 532nm R<0.25% b) * S1:HR @ 1064nm R>99.8% & HT@ 808nm T>95% S2:AR @ 1064 nm R<0.1% & 532nm R<0.25%