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
Part No. | Description | Application | Thickness | Price | Availability | Add to Cart |
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 |
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 @ 22oC, 1 KHz) |
Linear Optical Properties:
Transmitting Range | 350 - 5000 nm |
Refractive Indices: |
nx ny nz |
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 nz2=2.14768+1.29559λ2/(λ2-0.22719)-0.01436λ2 |
Thermo-optic Coefficients | dnx/dT=1.1x10-5 /oC, dny/dT=1.3x10-5 /oC dnz/dT=1.6x10-5 /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, d33=16.2 pm/V,d24=3.2 pm/V, d15=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 1064 nm, KTA is the crystal of choice for the effective generation of 3-5 μm through OPO/OPA. The NCPM OPO/OPA 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 |
Coatings:
Common dualband 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.
Mount:
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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