KTA Crystals

KTA Crystals
KTA Crystals KTA Crystals KTA Crystals

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 wide applications in second harmonic generation (SHG), sum and difference frequency generation (SFG)/(DFG), optical parametric oscillation/ amplification (OPO/OPA), and electro-optical Q-switching involving MIR wavelengths.

Application examples:

55 ps pulse @2.95 μm from a KTA OPA for selective cutting of biological tissues
High average power ns OPO @ 1535 nm with NCPM KTA
Noncollinear OPCPA in KTA produces intense 160 fs pulses @1550 nm
KTA OPA pumped by 120 fs amplified pulses to generate intense 3-5 μm pulses

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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 Å, b=6.5716 Å, c=10.786 Å, Z=8

Melting Point  

1130 oC

Curie Point  

880 oC

Mohs Hardness  

 ~ 5


3.45 g/cm3



Hygroscopic Susceptibility


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, 1 KHz)

Linear Optical Properties:

Transmitting Range     350 - 5000 nm      
Refractive Indices:
               1064 nm
               532 nm
    nx             ny            nz
 1.7818      1.7866      1.8680
 1.8264      1.8331      1.9310
Sellmeier Equations
λ in μm)  
nx2=1.90713+1.23522λ2 /(λ2-0.19692)-0.01025λ2
ny2=2.15912+1.00099λ2 /(λ2-0.21844)-0.01096λ2
Thermo-optic Coefficients   dnx/dT=1.1x10-5 /oC, dny/dT=1.3x10-5 /oC
-5 /oC   
Absorption Coefficient    α < 1% cm-1 @1064nm and 532nm   

Nonlinear Optical Properties:

Phasematchable SHG Range 542 - 1800 nm  
Nonlinear Optical Coefficients d31=2.8 pm/v, d32=4.2 pm/v,
33=16.2 pm/v,d24=3.2 pm/v,
15=2.3 pm/v
Effective Nonlinearity Expressions  deff(II)= (d24-d15)sin2φsin2θ-(d15sin2φ+d24cos2φ)sinθ
Electro-optic Coefficients
( Low frequency )
 γ13= 11.5 pm/V, γ23=15.4 pm/V, γ33=37.5 pm/V
Dielectric Constant εeff=42  

NCPM Tuning Curve for 1064nm pumped OPO/OPA

With its excellent transmission at the MIR and the possibility to achieve NCPM when pumped with the common Nd lasers at ~ 1 μm, KTA is the crystal of choice for the effective generation of 3-5 μm through OPO/OPA.  The NCPM OPO/A can be temperature tuned by placing an x-cut crystal in an oven. The tuning curve is as follows,



Specifications for finished KTA:

Wavefront distortion: less than λ/6 @ 633 nm
Dimension tolerance: (W +/-0.1 mm) x (H +/-0.1 mm) x (L + 0.2/-0.1 mm)
Clear aperture: > 90% central area
Flatness: λ/8 @ 633 nm
Scratch/Dig: 20/10 to MIL-O-13830A
Parallelism: better than 20 arc seconds
Perpendicularity: 5 arc minutes
Angle tolerance:   Δθ < +/-0.25o, Δφ < +/-0.25o




Standard coatings are dual band anti-reflection (DBAR) coatings at 1064/1535 nm, 1064/3480 nm,  1064/1650 nm, 1064/3000nm, or 1320/660 nm.  Coatings for other specific applications are available upon request.


For customer convenience and protection of crystals,  crystals with T≤ 3.0 mm can be
mounted in a 1" anodized aluminum holder.

Thicker crystals are typically supplied unmounted, but water-cooled or uncooled mounts can be offered upon request.

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