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KTA Crystal
KTA - Potassium Titanyle Arsenate(KTiOAsO4)- is an excellent NLO crystal for Optical Parametric Oscillation (OPO) application. KTA crystal has better non-linear optical and electro-optical coefficients, significantly reduced absorption in the 2.0-5.0 µm region, broad angular and temperature bandwidth, low dielectric constants. KTA crystal's low ionic conductivities result in higher damage threshold compared with KTP.
KTA Crystal Basic Properties
Crystal Structure: Orthorhombic, point group mm2
Lattice parameter: a=13.125Å, b=6.5716Å, c=10.786Å
Melting point: 1130 °C
Mohs Hardness: near 5
Density: 3.454g/cm³
Thermal conductivity: K1: 1.8W/m/K; K2: 1.9W/m/K; K3: 2.1W/m/K
KTA Crystal Optical and NLO Properties
Transparency Range: 350-5300 nm
Absorption Coefficients: <0.05 %/cm @1064 nm, <0.05 %/cm @ 1533 nm, <5%/cm @ 3475 nm
NLO susceptibilities(pm/V):
d31 = 2.76, d32 = 4.74, d33 = 18.5 , d15 = 2.3, d15 = 3.2
Sellmeier Equation:
Ni2=Ai+Bi*λ2/(λ2-Ci)-Di*λ2 (λ in µm)
Nx: A=1.90713, B=1.23522, C=0.19692, D=0.01025
Ny: A=2.15912, B=1.00099, C=0.21844, D=0.01096
Nz: A=2.14768, B=1.29559, C=0.22719, D=0.01436
Electro-Optical Constants(pm/V)
(low frequency): r33=37.5, r23=15.4, r13=11.5
SHG Phase Matchable Range: 1083-3789 nm
KTA Crystal Specifications
Dimension Tolerance: +0/-0.1mm(WxH) and+0.1/-0.2mm thickness
Surface Quality: 10-5 Scratch-dig
Flatness: <λ/8 @633nm
Chamfer: 0.1mm@45deg.
Clear Aperture: Central 90% of Diameter
Parallelism: <10 arc seconds
Perpendicular: <10 arc minutes
Orientation Angle: +/-0.25deg.
AR coating: R<0.2%