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KTA Crystals & Applications

Potassium Titanyle Arsenate(KTiOAsO4, KTA)- is an excellent NLO crystal, particularly suited for Optical Parametric Oscillation or Amplifier (OPO/OPA) application at generating high power mid-infrared (MIR 3-5µm) laser. KTA crystal exhibits enhanced non-linear optical and electro-optical coefficients, significantly reduced absorption in the 2.0-5.0 µm region, broad angular and temperature acceptance, low dielectric constants. Furthermore, the low ionic conductivities of KTA crystals contribute to a higher damage threshold when compared to KTP.

High power 2.0-5.0 µm mid-infrared laser source has recently achieved significant applications in biological tissuses study, security and defense devices. By using a 1064nm Nd:YAG or a 1030nm Yb:YAG pump, an x-cut KTA crystal can be temperature-tuned to generate 2-5 µm mid-infrared laser.

Properties of KTA Crystal

Crystal Structure:

Orthorhombic, space group Pna21, point group mm2

Lattice parameter:

a=13.125Å, b=6.5716Å, c=10.786Å

Melting point:

1130 °C

Curie Point:

880 °C

Mohs Hardness:

Hygroscopic Susceptibility:

Density:

3.454g/cm³

Specific Heat:

0.687 J/g/K

Thermal conductivity:

K1: 1.8W/m/K; K2: 1.9W/m/K; K3: 2.1W/m/K

Electrical Conductivity:

0.7-3.4 x10^-6 s/cm (c-axis @ 22°C, 1 KHz)

Transparency Range:

350-5300 nm

Sellmeier Equation(λ in μm):

nx²=1.90713+1.23522λ²/(λ²-0.19692)-0.01025λ²
ny²=2.15912+1.00099λ²/(λ²-0.21844)-0.01096λ²
nz²=2.14768+1.29559λ²/(λ²-0.22719)-0.01436λ²

Refractive Indices:	nx	ny	nz
532nm	1.8264	1.8331	1.9310
1064nm	1.7818	1.7866	1.8680
1535nm	1.7717	1.7763	1.8544
3480nm	1.7385	1.7411	1.8098

Thermo-optic Coefficients:

dnx/dT=1.1x10^-5 /°C, dny/dT=1.3x10^-5 /°C dnz/dT=1.6x10^-5 /°C

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

SHG Phase Matchable Range:

1083-3789 nm

Effective Nonlinearity Expressions:

deff(II)= (d24-d15)sin(2φ)sin(2θ)-(d15sin²φ+d24cos²φ)sinθ

Electro-Optical Constants(pm/V)(low frequency):

r33=37.5, r23=15.4, r13=11.5

Dielectric Constant:

ε_eff=42

General Specifications of KTA Crystal

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%/0.5% Dualband AR or Broadband AR coating R<1%

i. KTA Crystal

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