High Quality for Ln - KTA Crystal – WISOPTIC

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High Quality for Ln - KTA Crystal – WISOPTIC Detail:

KTA (Potassium Titanyle Arsenate, KTiOAsO₄ ) is a nonlinear optical crystal similar to KTP in which atom P is replaced by As. It has good non-linear optical and electro-optical properties, e.g. significantly reduced absorption in band range of 2.0-5.0 µm, broad angular and temperature bandwidth, low dielectric constants.

Compared with KTP, the main advantages of KTA include: higher second-order nonlinear coefficient, longer IR cut-off wavelength, and less absorption at 3.5 µm. KTA also has lower ionic conductivity than that of KTP, which results in a higher laser induced damage threshold.

KTA is very popularly used for Optical Parametric Oscillation (OPO) application which gives high energy conversion efficiency (above 50%) of tunable laser radiation in solid lasers.

Contact us for the best solution for your application of KTA crystals.

WISOPTIC Advantages - KTA

• High homogeneity, excellent internal quality

• Top quality of surface polishing

• Large block for various size (e.g. 10x10x30mm³, 5x5x35mm³)

• Large nonlinear coefficient, high conversion efficiency

• Broad transparency range, large temperature matching width

• AR coatings for wave range from visual light to 3300 nm

• Very competitive price, quick delivery

WISOPTIC Standard Specifications^* - KTA

Dimension Tolerance	± 0.1 mm
Cutting Angle Tolerance	< ± 0.25°
Flatness	< λ/8 @ 632.8 nm
Surface Quality	< 10/5 [S/D]
Parallelism	< 20”
Perpendicularity	≤ 5′
Chamfer	≤ 0.2mm @ 45°
Transmitted Wavefront Distortion	< λ/8 @ 632.8 nm
Clear Aperture	> 90% central area
Coating	AR@1064nm(R<0.2%) & 1533nm(R<0.5%) & 3475nm(R<9%) or upon request
Laser Damage Threshold	500 MW/cm² for 1064nm, 10ns, 10Hz (AR-coated)
* Products with special requirement upon request.

kta
KTA-2
KTA-1

DOWNLOAD Technical Data – KTA

Main Features - KTA

• High nonlinear coefficient, high electro-optical coefficient

• Wide acceptance angle, small wall-off angle

• Broad transparency range, large temperature matching width

• Small dielectric constant, low ionic conductivity

• Lower absorption in 3-4 µm spectrum range than that of KTP

• High laser damage threshold

Primary Applications – KTA

• OPO for mid IR generation – up to 4 µm

• Sum and Difference Frequency Generation in mid IR range

• Electro-optical modulation and Q-switching

• Frequency doubling (SHG @1083nm-3789nm).

Physical Properties – KTA

Chemical formula	KTiOAsO₄
Crystal structure	Orthorhombic
Point group	mm2
Space group	Pna2₁
Lattice constants	a=13.103 Å, b=6.558 Å, c=10.746 Å
Density	3.454 g/cm³
Melting point	1130 °C
Curie temperature	881 °C
Mohs hardness	5
Thermal conductivity	k₁=1.8 W/(m·K), k₂=1.9 W/(m·K), k₃=2.1 W/(m·K)
Hygroscopicity	non-hygroscopic

Optical Properties- KTA

Transparency region (at “0” transmittance level)	350-5300 nm
Refractive indices (@632.8 nm)	n_x	n_y	n_z
Refractive indices (@632.8 nm)	1.8083	1.8142	1.9048
Linear absorption coefficients (@532 nm)	α = 0.005/cm
NLO coefficients (@1064 nm)	d₁₅=2.3 pm/V, d₂₄=3.64 pm/V, d₃₁=2.5 pm/V, d₃₂=4.2 pm/V, d₃₃=16.2 pm/V
Electro-optic coefficients (@632.8nm; T=293K, low frequency)	r₁₃	r₂₃	r₃₃
	11.5 ± 1.2 pm/V	15.4 ± 1.5 pm/V	37.5 ± 3.8 pm/V

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