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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Model	Name	application	thickness	Price	Availability	Action
KTA5150-OPO1535(II)-AR	KTA crystal, size 5x5x15mm, X-cut for 1064nm pumped NCPM OPO/A to generate 1535nm @ ~ 20 degC, both faces AR@1064/1535nm	1064nm OPO/A	15.0 mm	Ask	Out Of Stock
KTA5200-OPO1535(II)-AR	KTA crystal, size 5x5x20mm, X-cut for 1064nm pumped NCPM OPO/A to generate 1535nm @ ~ 20 degC, both faces AR@1064/1535nm	1064nm OPO/A	20.0 mm	Ask	Out Of Stock
KTA7200-OPO1535(II)-AR	KTA crystal, size 7x7x20mm, X-cut for 1064nm pumped NCPM OPO/A to generate 1535nm @ ~ 20 degC, both faces AR@1064/1535nm	1064nm OPO/A	20.0 mm	Ask	Out Of Stock
KTA8200-OPO1535(II)-AR	KTA crystal, size 8x8x20mm, X-cut for 1064nm pumped NCPM OPO/A to generate 1535nm @ ~ 20 degC, both faces AR@1064/1535nm	1064nm OPO/A	20.0 mm	Ask	Out Of Stock
KTA7200-OPO3480(II)-AR	KTA crystal, size 7x7x20mm, X-cut for 1064nm pumped NCPM OPO/A to generate 3480nm @ ~ 20 degC, both faces AR@1064/3480nm	1064nm OPO/A	20.0 mm	Ask	Out Of Stock
KTA4200-OPO1650(II)-AR	KTA crystal, size 4x4x20mm for 1064nm pumped OPO/A to generate 1650 and 3000nm @ ~ 20 degC, both faces AR@1064/1650nm	1064nm OPO/A	20.0 mm	Ask	Out Of Stock

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KTA is a positive biaxial crystal, with the principal axes X, Y, and Z ( n_z>n_y>n_x) 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: 532 nm 1064 nm 1535 nm 3480 nm	nx ny nz 1.8264 1.8331 1.9310 1.7818 1.7866 1.8680 1.7717 1.7763 1.8544 1.7385 1.7411 1.8098
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	dn_x/dT=1.1x10-5 /oC, dn_y/dT=1.3x10-5 /oC dn_z/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.