KTA Crystal

  • Update:Jun 13, 2017
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KTA crystal features large non-linear optical and electro-optical coefficients in comparison to KTP and has the added benefit of significantly reduced absorption in the 2 to 5 m region.

Product Introduction

KTA crystal features large non-linear optical and electro-optical coefficients in comparison to KTP and has the added benefit of significantly reduced absorption in the 2 to 5 μm region. It has found more and more applications in second harmonic generation (SHG), sum and difference frequency generation (SFG)/(DFG), optical parametric oscillation/ amplification (OPO/OPA), and electro-optical Q-switching.

KTA features

KTA is a positive biaxial crystal, with the principal axes X, Y, and Z ( nz>ny>nx ) parallel to the crystallographic axes a, b, and c, respectively.

Structural and Physical Properties

Crystal Structure   Orthorhombic, space group Pna21, point group mm2
Cell Parameters   a=13.125?, b=6.5716?, c=10.786 ?, Z=8
Melting Point   1130oC
Curie Point   880oC
Mohs Hardness    ~ 5
Density   3.45 g/cm3
Color   colorless
Hygroscopic Susceptibility No
Specific Heat   0.687 J/g/K
Thermal Conductivity   1.8 W/m/K
Electrical Conductivity   0.7-3.4 x10-6 s/cm (c-axis, @22 oC, 1KHz)

  Linear Optical Properties:

Transmitting Range     350 nm - 5500 nm      
Refractive Indices:                1064nm                 532nm        nx             ny            nz 1.7818      1.7866      1.8680 1.8264      1.8331      1.9310
Sellmeier Equations  (l in μm)   nx2=1.90713+1.23522l2 /(l2-0.19692)-0.01025l2 ny2=2.15912+1.00099l2 /(l2-0.21844)-0.01096l2 nz2=2.14768+1.29559l2/(l2-0.22719)-0.01436l2
Thermo-optic Coefficients   dnx/dT=1.1x10-5/oC, dny/dT=1.3x10-5/oC dnz/dT=1.6x10-5/oC   
Absorption Coefficient    a < 1% cm-1 @1064nm and 532nm   

  Nonlinear Optical Properties:

Phasematchable SHG Range 542 - 1800nm  
Nonlinear Optical Coefficients d31=2.8pm/v, d32=4.2pm/v,  d33=16.2pm/v,d24=3.2pm/v, d15=2.3pm/v
Effective Nonlinearity Expressions  deff(II)= (d24-d15)sin2fsin2q-(d15sin2f+d24cos2f)sinq
Electro-optic Coefficients ( Low frequency )  r13= 11.5pm/V,   r23=15.4pm/V, r33=37.5pm/V
Dielectric Constant eeff=42  

Coating and Mount

Standard dual band anti-reflection (DBAR) coatings at 1064nm/1530 nm, 1064/3200nm, or 1320nm/660nm are available. Other coatings are also available upon request. Mounts may be provided free of charge. 

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