Potassium Titanyle Arsenate (KTiOAsO4), or KTA crystal, is an excellent nonlinear optical crystal for Optical Parametric Oscillation (OPO) application. It 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. And its low ionic conductivities result in higher damage threshold compared with KTP .
KTA is often used as an OPO / OPA gain medium for emission in the 3µm range as well as an OPO crystal for eye-safe emission at high average power.
Feature:
Transparent between 0.5µm and 3.5µm
High non-linear optical efficiency
Large temperature acceptance
Lower birefringence than KTP resulting in a smaller walk-off
Excellent optical and non-linear optical homogeneity
High damage threshold of AR-coatings: >10J/cm² at 1064nm for 10ns pulses
AR-Coatings with low absorption at 3µm available
Qualified for space projects
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 |
Optical and Nonlinear Optical Properties | |
Transparency Range | 350-5300nm |
Absorption Coefficients | @ 1064 nm<0.05%/cm |
@ 1533 nm<0.05%/cm | |
@ 3475 nm<5%/cm | |
NLO Susceptibilities (pm/V) | d31 = 2.76, d32 = 4.74, d33 = 18.5 , d15 = 2.3, d24 = 3.2 |
Electro-optical constants (pm/V)(low frequency) | r33=37.5; r23=15.4; r13=11.5 |
SHG Phase Matchable Range | 1083-3789nm |