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          KTA (Potassium Titanyl Arsenate, KTiOAsO4 )

 

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

  • Large nonlinear optical coefficients

  • Wide angular bandwidth and small walk-off angle

  • Broad temperature and spectral bandwidth

  • Large electro-optic coefficients

  • Lower absorption in the 3-4 μm range than KTP.

  • Nonhydroscopic, chemically and mechanically stable

  • High thermal conductivity

  • High damage threshold

  •  

    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  

     

    Specifications for finished KTA
    Wavefront distortion: less than l/4 @ 633 nm
    Dimension tolerance: (W +/- 0.1 mm) x (H +/- 0.1 mm) x (L + 0.2 mm/-0.1mm)
    Clear aperture: > 90% central area
    Flatness: l/8 @ 633 nm
    Scratch/dig: 10/5 to MIL-O-13830A
    Parallelism: better than 20 arc seconds
    Perpendicularity: 5 arc minutes
    Angle tolerance: Dq< +/-0.25o, Df< +/-0.25o

     

    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.

     

    Nd:YAG rod     Nd:YVO4     KTA     Er:YAG      (Nd, Ce):YAG      Yb:YAG     Cr4+:YAG      KTP    LBO      BBO   Nd:GGG

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