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  • Name: KTA
  • No.: 113
  • Update: 2014-05-21
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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, solid state, tunable laser radiation exhibiting energy conversion efficiencies above 50%. In addition, KTA has a very high damage threshold.

In comparison to KTP, KTA crystals feature large non-linear optical and electro-optical coefficients and have significantly reduced absorption in the 2.0 - 5.0 m range. Its low dielectric constants, low loss tangent and ionic conductivities are orders of magnitude less than that of KTP.

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)

 

 

 

P/N

Type

Size(mm)

Coatings

KTA-O-4420-C1/C1

OPO

4x4x20

AR/AR@1064&1540&3442nm

KTA-O-5520-C1/C1

OPO

5x5x20

AR/AR@1064&1540&3442nm

KTA-O-6620-C1/C1

OPO

6x6x20

AR/AR@1064&1540&3442nm

KTA-O-7720-C1/C1

OPO

7x7x20

AR/AR@1064&1540&3442nm

KTA-O-8820-C1/C1

OPO

8x8x20

AR/AR@1064&1540&3442nm

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