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KTP Crystals

Physical and optical properties

Chemical formula KTiOPO4
Crystal structure Orthorhombic, mm2
Lattice parameters a = 12,814 Å, b = 6,404 Å, c = 10,616 Å
Optical symmetry Positive biaxial (2VZ = 37,4° @0,5461 μm)
Density 2,945 g/cm3
Mohs hardness 5
Transparency range 350 nm - 4,5 μm @"0" transmittance level
Dispersion equations @188 nm - 5.2 µm (λ in µm) nX2 = 3,0067 + 0,0395/(λ2 - 0,04251) - 0,01247 λ2;
nY2 = 3,0319 + 0,04152/(λ2 - 0,04586) - 0,01337 λ2;
nZ2 = 3,3134 + 0,05694/(λ2 - 0,05941) - 0,016713 λ2
Refractive indices @1064 nm nX = 1,7404; nY = 1,7479; nZ = 1,8296

Standard specifications

Orientation accuracy <30 arcmin
Clear aperture >90%
Face dimensions tolerance +0/-0.1 mm
Length tolerance ±0.1 mm
Parallelism error <20 arcsec
Perpendicularity error <5 arcmin
Protective chamfers <0.1 mm at 45˚
Surface quality 10-5 S-D
Wavefront distortion λ/8@632,8 nm
Coatings AR(R<0,25%)@532+1064 nm on both faces
Laser induced damage threshold >500MW/cm2@1064 nm, 10 ps
Mount Unmounted