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KTA

Potassium Titanyle Arsenate (KTiOAsO4, or KTA) crystal is an excellent nonlinear optical crystal for Optical Parametric Oscillation (OPO) application. OPO devices based on KTAs are reliable tunable laser sources exhibiting high energy conversion efficiencies above 50%. In addition, KTA has a high damage threshold. KTA crystals feature large non-linear optical and electro-optical coefficients and have significantly reduced absorption in the 3.0 - 4.0 m range. Its low dielectric constants, low loss tangent and ionic conductivities are orders of magnitude less than that of KTP. Keywords: KTA,KTA crystal
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Product description
Potassium Titanyle Arsenate (KTiOAsO4, or KTA) crystal is an excellent nonlinear optical crystal for Optical Parametric Oscillation (OPO) application. OPO devices based on KTAs are reliable tunable laser sources exhibiting high energy conversion efficiencies above 50%. In addition, KTA has a high damage threshold.
 
KTA crystals feature large non-linear optical and electro-optical coefficients and have significantly reduced absorption in the 3.0 - 4.0 m range. Its low dielectric constants, low loss tangent and ionic conductivities are orders of magnitude less than that of KTP.

 


Physical Property:

Crystal Structure Orthorhombic, Point group mm2
Lattice Parameters a=13.125Å ,b=6.5716Å, c=10.786Å; Z=8
Density 3.454 g/cm3
Mohs Hardness ~ 5
Melting Point 1130°C
Curie Point 880°C
Specific Heat 0.687 cal/goC (25oC)
Dielectric Constant eeff =42
Absorption Coefficient <0.05%/cm @1μm and 1.5μm
Electrical Conductivity 0.7-3.4 x10-6s/cm (c-axis, 22oC, 2KHz)
Color Colorless
Hygroscopic Susceptibility No
 
Optical Property:
Transparency Range 0.35μm ~ 5.3μm
Nonlinear Coefficients d31=2.8 pm/V, d32=4.2 pm/V, d33=16.2 pm/V
(@1.064μm) d24=3.2 pm/V, d15=2.3 pm/V
Electro-optical constants r33 r23 r13
(low frequency) 37.5 pm/V 15.4 pm/V 11.5 pm
Sellmeier Equations nx2 = 1.90713+1.23522l2/(λ2-0.19692)-0.01025λ2
(λ in μm) ny2 = 2.15912+1.00099l2/(λ2-0.21844)-0.01096λ2
  nz2 = 2.14768+1.29559l2/(λ2-0.22719)-0.01436λ2
Refractive Indexes (@1.064μm) nx ny nz
1.783 1.7893 1.8679
SHG PM range 1μm ~ 3μm
cut angle for NCPM OPO θ φ  
90 0  
wavelength for NCPM OPO Pump  Signal  Idler 
1064 nm 1533 nm 3475 nm 

 

APPLICATION:
● Optical Parametric Oscillation (OPO)
● Frequency Doubling (SHG @1083nm-3789nm) 
● Sum and Difference Frequency Generation (SFG)/(DFG) 
● Electro-Optical Q-switch and modulation for Optical waveguides
 
ADVANTAGE:
● Large nonlinear optical and electro-optical coefficients
● Wide angular bandwidth and small walk-off angle 
● Broad temperature and spectral bandwidth 
● Low dielectric constants, loss tangent and ionic conductivities (much less than that of KTP) 
● High damage threshold 
● Lower absorption in the 3-4 µm spectrum range than KTP.
● Highly resistant to high intensity laser radiation.
 
Dimension Tolerance
W(+/-0.1)*H(+/-0.1)*L(+0.5/-0.1)mm
Angle Tolerance
+/-0.25°
Perpendicularity
≤10′
Scratch/Dig
20/10
Chamfer
≤0.2mmx45°
Parallelism
≤20″
Chips
≤0.1mm
Flatness
λ/10@633nm
Clear Aperture
≥90%
Wavefront distortion
λ/4@633nm
 
Coatings
C1---AR@1064(R<0.2%)&1533(R<0.5%)&3475(R<10%)
Damage Threshold
500MW/cm² (1064nm, 10ns, 10Hz)

 

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