Get a quote
KTA Crystal

POC-OC-122409-KTA Crystal

  • High nonlinear optical and electro-optical coefficients, with reduced absorption in the 2.0-5.0 µm range.
  • Broad angular and temperature bandwidth for enhanced application flexibility.
  • High damage threshold and low ionic conductivity for superior durability.
  • Crystal dimensions ranging from 0.1 mm to 30 mm, available with AR-coating up to 3300 nm.
  • Re-polishing and re-coating services with fast delivery (15-20 working days for polished/AR-coated products).

Customizable Components Available for This Material to Meet Your Specific Needs!

Click here to Get a Quote

Material General Description of  KTA Crystal

Potassium Titanyl Arsenate (KTiOAsO₄), commonly referred to as KTA Crystal, is a high-performance nonlinear optical material primarily used in Optical Parametric Oscillation (OPO) applications. KTA exhibits superior optical and electro-optical properties, including significantly reduced absorption in the mid-infrared (2.0-5.0 µm) region, broader temperature acceptance, and a lower dielectric constant compared to its counterpart KTP (Potassium Titanyl Phosphate). Its high damage threshold, minimal ionic conductivity, and stable chemical properties make it ideal for demanding applications in laser systems, medical devices, and advanced photonics.

KTA’s transparency range extends from 350 nm to 5300 nm, making it versatile for both visible and infrared applications. The crystal’s low thermal conductivity is compensated by its high optical quality, making it a preferred choice for frequency mixing, parametric generation, and Q-switching.

 

General Applications and Examples

KTA Crystals are widely employed in photonic systems due to their exceptional nonlinear optical properties. Some key applications include:

  1. Optical Parametric Oscillators (OPOs):
    • KTA is extensively used in tunable OPO systems for generating coherent radiation in the mid-infrared (2.0-5.0 µm) range.
    • Example: A KTA-based OPO can provide outputs from 1083 nm to 3789 nm with efficiency exceeding 50%.
  2. Frequency Doubling and Mixing:
    • KTA efficiently converts laser wavelengths into higher harmonics, such as doubling and tripling frequencies of Nd:YAG and other infrared lasers.
    • Example: SHG and SFG in medical and industrial laser systems for specific wavelength outputs.
  3. Q-Switching:
    • KTA’s high damage threshold and reduced absorption are ideal for electro-optical Q-switching in high-power laser systems.
    • Example: Compact Q-switched lasers for LiDAR and material processing.
  4. Advanced Optical Applications:
    • Suitable for applications like difference frequency generation (DFG), sum frequency generation (SFG), and electro-optical modulators.
    • Example: Generating THz radiation in terahertz systems using DFG in a KTA crystal.
  5. Custom Configurations:
    • Customization in dimensions, coatings, and properties ensures adaptability for scientific, industrial, and medical innovations.

Chemical and Structural Properties

Property

Details

Crystal Structure

Orthorhombic, Point group mm2

Lattice Parameters

a = 13.125 Å, b = 6.5716 Å, c = 10.786 Å

Melting Point

1130°C

Mohs Hardness

~5

Density

3.454 g/cm³

Thermal Conductivity

K1: 1.8 W/m·K, K2: 1.9 W/m·K, K3: 2.1 W/m·K

Optical and Nonlinear Optical Properties

Property

Details

Transparency Range

350-5300 nm

Absorption Coefficients

<0.05%/cm @ 1064 nm, 1533 nm

NLO Susceptibilities

d₃₁ = 2.76 pm/V, d₃₂ = 4.74 pm/V, d₃₃ = 18.5 pm/V

Electro-Optical Constants

r₁₃ = 37.5 pm/V, r₃₃ = 15.4 pm/V

SHG Phase Matchable Range

1083-3789 nm

Sellmeier Equations (λ in µm)

n² = A + Bλ²/(λ² – C²) – Dλ²

Constants for Sellmeier Equations:

A = 1.90713, B = 1.23522, C = 0.19692, D = 0.01025

Standard Fabrication Specifications

Specification

Details

Dimension Tolerance

W × H (± 0.1 mm) × L (+0.5/-0.1 mm)

Angle Tolerance

Δθ < 0.25°, Δφ < 0.25°

Parallelism

< 20 arc seconds

Surface Flatness

λ/8 @ 633 nm

Scratch/Dig

10/5

Wavefront Distortion

λ/8 @ 633 nm

Chamfer

0.1 mm @ 45°

Damage Threshold

>0.5 GW/cm² (AR-coated @ 1064 nm)

Spectrum Transmission Curve:

Spectrum transmission data confirms KTA’s high transparency from 350 nm to 5300 nm, ensuring low absorption losses and broad applicability in optical systems.

Coating Specification:

  • Anti-Reflection (AR) Coatings:
    • Visible region (350-700 nm)
    • Near-IR region (700-2500 nm)
    • Broadband AR coatings up to 3300 nm
  • Coating Durability: High resistance to damage and scratches under standard operating conditions.
  • Custom Coating Options: Available upon request.
  • Adhesion Test Compliant with MIL-C-675C military standards, an adhesion test involved applying a tape that meets LT-90 specifications onto the lens film layer. The tape was affixed fully and then removed vertically. This procedure was performed three times, resulting in no blistering or peeling.
  • Temperature Test In line with MIL-C-675C specifications, test pieces were subjected to temperatures of -62±1℃ and 71±1℃. After maintaining them at room temperature (16℃~32℃) for two hours, the adhesion test was repeated, confirming no film detachment.
  • Abrasion Resistance Test Conforming to MIL-C-675C and CCC-C-440 standards, the abrasion resistance test involved a gauze tester applying a minimum force of 1.0 lbs (0.45 kg) to the film. This was repeated 25 times with gauze widths of 1/4 inch (6.4mm) and 3/8 inch (9.5mm), ensuring no damage occurred to the film surface.
  • Humidity Test Under MIL-C-675C criteria, the test piece was placed in a controlled temperature and humidity chamber set to 49 ±2℃ and 95%~100% humidity for 24 hours. The film remained intact, with no peeling, scratches, or other defects.
  • Solvent and Cleaning Testing Following MIL-C-675C specifications, test pieces were exposed to room temperature conditions (16℃~32℃) and tested with acetone and alcohol for at least 10 minutes each. After air drying and subsequent cleaning with a cotton cloth soaked in alcohol, the film surface showed no signs of peeling or scratches.
  • Salt Spray Test After 100 hours in a 35°C environment with a 5% saltwater concentration, the film showed no signs of damage.

 

POC Strength and Capabilities

Photonics On Crystals (POC) leads the industry in advanced LBO crystal fabrication and customization. With a state-of-the-art manufacturing facility and a team of expert engineers, POC delivers products with precise quality control and rapid turnaround. Our capabilities include bespoke crystal dimensions, anti-reflective and DLC coatings, and system integration for a variety of applications. POC is dedicated to providing tailored solutions, meeting the demands of industries ranging from medical diagnostics to aerospace.

Standard Products

Face Dimensions (mm)

Length (mm)

Coating

Application

Price (USD)

3 × 3

5

AR@1064 nm

SHG Type II

$350

5 × 5

10

AR@532 nm

OPO

$480

7 × 7

15

Broadband AR

SFG/DFG

$650

Custom

Custom

Upon Request

Tailored for Applications

Quote Available

POC-OC-122409-KTA Crystal

Related products