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KYW Crystal

POC-OC-122470-KYW Crystal

  • Wide transparency range from 350 nm to 5.5 µm.
  • Two prominent Raman shifts at 765 cm⁻¹ and 905 cm⁻¹.
  • High optical damage threshold for advanced laser applications.
  • Excellent thermal conductivity for efficient energy transfer.
  • Customizable dimensions, orientation, and coatings available upon request.

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

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KYW Crystal Material General Description

Potassium Yttrium Tungstate (KYWO₄₂) is a high-performance Raman crystal used extensively in advanced laser systems. KYW crystals exhibit broad transparency, ranging from 350 nm to 5.5 µm, making them suitable for various laser-based applications. Their high thermal conductivity, which is approximately three times higher than barium nitrate, ensures efficient heat dissipation during high-power operations.

KYW are specifically designed for Raman frequency shifting, featuring two large Raman modes at 765 cm⁻¹ and 905 cm⁻¹. The crystals offer good mechanical properties, high optical damage thresholds, and superior radiation frequency tuning capabilities. These properties make KYW  ideal for high-intensity laser applications.

Photonics On Crystals (POC) ensures consistent quality, competitive pricing, and customizable options tailored to specific requirements.

KYW Crystal General Applications and Examples

KYW crystals are widely utilized in:

  • Raman Lasers: Used for achieving precise wavelength conversion and enhanced laser output power. KYW’s dual Raman shifts make it ideal for high-performance Raman generators.
  • Radiation Frequency Tuning: The crystal’s broad transparency range facilitates the tuning of frequencies for scientific and industrial applications.
  • Medical Lasers: Due to their high thermal conductivity and broad transparency, KYW  are used in advanced medical lasers for precise surgical procedures.
  • Defense and Research: KYW are integral in high-energy laser systems for defense, spectroscopy, and research applications, where precision and durability are critical.

Chemical and Structural Properties

Property

Value

Chemical Formula

K(YWO₄)₂

Crystal Structure

Monoclinic, C2/c

Lattice Parameters

a = 10.64 Å, b = 10.32 Å, c = 7.55 Å

Density

6.61 g/cm³

Mohs Hardness

4–5

Transparency Range

0.35 µm – 5.5 µm

Thermal Conductivity (average)

3.3 W/m·K

dn/dT (Refractive Index Temperature Coefficient)

dn/dTₓ = -1.4 × 10⁻⁴ K⁻¹
dn/dTᵧ = -8.9 × 10⁻⁵ K⁻¹
dn/dT𝓏 = -1.2 × 10⁻⁴ K⁻¹

Refractive Indices (1064 nm)

nₓ = 1.9868, nᵧ = 2.0055, n𝓏 = 2.0367

Optical, Laser and Nonlinear Optical Properties

Optical Property

Value

Raman Frequency Shifts

765 cm⁻¹ (E

Raman Linewidth

5.4 cm⁻¹ (polarization E

Raman Gain Coefficient

3.6 cm/GW (steady-state regime at 1064 nm)

Standard Fabrication Specifications

Specification

Value

Orientation

b-cut

Clear Aperture

>90%

Face Dimensions Tolerance

+0/-0.1 mm

Length Tolerance

±0.1 mm

Parallelism Error

<20 arcsec

Perpendicularity Error

<10 arcmin

Surface Flatness

<λ/8 @ 632.8 nm

Surface Quality

10-5 S-D

Wavefront Distortion

<λ/8 @ 632.8 nm

Spectrum Transmission Curve:

The transmission spectrum of KYW crystals spans from 350 nm to 5.5 µm, offering high transparency across a broad wavelength range, crucial for Raman laser operations. Additional data or graphs available upon request.

Coating Specification:

 

  • AR Coating: Available for the 450–800 nm or 450–850 nm ranges. Custom coatings available on demand.
  • Reflectance: <0.2% at specific wavelengths.
  • High-durability coatings designed for high-power applications.
  • 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) leverages cutting-edge manufacturing technologies to deliver high-quality KYW crystals. Our expertise includes:

  • Customizable sizes, orientations, and coatings to meet specific application needs.
  • Competitive pricing with rigorous quality assurance for consistent performance.
  • Technical support and consultation for optimizing laser system performance.
  • Fast delivery for both standard and custom orders.

Standard Products

Face Dimensions

Length

Coatings

Price (USD)

15 mm x 15 mm

5 mm

Uncoated

440

15 mm x 15 mm

10 mm

AR(450–800 nm)

600

5 mm x 5 mm

30 mm

AR(450–800 nm)

780

8 mm x 8 mm

50 mm

AR(450–800 nm)

1120

Customization

Any

Per customer request

TBD

POC-OC-122470-KYW Crystal

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