NLO Crystals
  LBO
  BIBO
  KTP
  GTR-KTP
  RTP
  KTA
  BBO
Laser Crystals
Electro-optics crystals
Optical Components

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

KTA
Potassium Titanyle Arsenate(KTiOAsO4), or KTA ）crystal, is an excellent nonlinear optical crystal for Optical Parametric Oscillation (OPO) Application.  OPO devices based on KTA are reliable, solid state sources of 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.
Properties

Formulation 

KTiOAsO4 

Crystal structure

Orthorhombic 

Lattice parameters

Point group

mm2

Hardness (Mohs) 

near 5

Hygroscopic susceptibility

none 

Chemically 

stable 

Melting Point

1130±5°C

Ferroelectric transition temperature

880°C

Density 

3.454 g/cm3 

Hygroscopic susceptibility

No

Dielectric constant

ε33=42

Thermal conductivity(mW/cm·k)

K1=18；K2=19； K3=21

Ionic conductivity (20℃, 10kHz)

0.7 - 3.4.10-6S/cm 

Absorption

@ 1064 nm <0.05 %/cm ; @ 1533 nm <0.05 %/ cm ; @ 3475 nm <5%/cm 

Transmitting range

0.35-5.3um

Refractive indices@ 1064 nm

nx=1.782; ny=1.790; nz=1.868

Sellmeier equations
Ni2=Ai+Biλ/(λ2-Ci2)-Diλ2

index

A

B

C

D

Nx

1.90713

1.23522

0.19692

0.01025

Ny

2.15912

1.00099

0.21844

0.01096

Nz

2.14768

1.29559

0.22719

0.01436

Phase matching range(nm)

1075-1134nm

Nonlinear Coefficients(pm/v)

d15=2.3, d24=3.2, d31=2.8, d32=4.2, d33=16.2

damage threshold(10 ns pulse)

15J/cm2@1064 nm

NCPM Angle

Theta:90°; phi:0

Wavelength

Pump:1064 nm; Signal:1533 nm; Idler:3475 nm 

E-O constants(low frequency)

r33:37.5 pm/V; r23:15.4pm/V; r13:11.5pm/V

Advantages

  1. Large nonlinear optical and electro-optical coefficients
  2. Wide angular bandwidth and small walk-off angle
  3. Broad temperature and spectral bandwidth
  4. Low dielectric constants, loss tangent and ionic conductivities (much less than that of KTP)
  5. High damage threshold

Specification of Sino-crystal's KTA crystal