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Yb:KYW Crystal

POC-OC-122452-Yb:KYW Crystal

  • Large gain bandwidth supporting ultra-short pulse durations (<100 fs).
  • High emission cross-sections for efficient laser operation.
  • Small quantum defect for reduced thermal effects.
  • Excellent thermal conductivity (3–4 W/m·K) suitable for high-power applications.
  • Customizable doping levels and crystal dimensions available on request.

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

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Yb:KYW Crystal Material General Description

The Yb:KYW Crystal (Ytterbium-doped Potassium Yttrium Tungstate) is a leading gain medium known for its extensive gain bandwidth and high emission cross-sections. Its properties make it suitable for femtosecond and mode-locked laser systems, achieving ultra-short pulse durations below 100 femtoseconds. Compared to other Yb-doped materials, Yb:KYW exhibits superior performance due to its high doping levels without concentration quenching, enabling reliable high-power output. The thermal conductivity of Yb:KYW ensures stability in high-energy applications, making it an excellent choice for regenerative amplifiers and continuous-wave lasers.

 

Yb:KYW Crystal General Applications and Examples

The Yb:KYW Crystal serves as a robust medium in:

  • Femtosecond Laser Systems: Ideal for precision material processing and high-resolution imaging.
  • Regenerative Amplifiers: Used in industrial micromachining for metals and semiconductors.
  • Medical Applications: Enables precise surgical cutting with minimal thermal damage.
  • Continuous-Wave (CW) Lasers: For high-power and highly stable beam generation.
  • Scientific Research: Utilized in spectroscopic studies and laser-based experiments.

Example Application:
A Yb:KYW crystal doped with 5% ytterbium ions can produce a stable output of ultrashort pulses with a center wavelength of 1020 nm, supporting advanced micromachining for nanotechnology and biophotonics.

Chemical and Structural Properties

Property

Value

Chemical Formula

KY(WO4)2 doped with Yb^3+

Crystal Structure

Monoclinic

Density

6.41 g/cm³

Mohs Hardness

5

Thermal Conductivity

3–4 W/m·K

Thermal Expansion Coefficient

α_a = 9.8 × 10^-6 /°C

Doping Levels

2–10% Yb^3+

Optical, Laser and Nonlinear Optical Properties

Parameter

Value

Absorption Peak Wavelength

444 nm

Absorption Cross-section

8 x 10^-19 cm²

Absorption Bandwidth

~5 nm

Emission Wavelengths

523 nm, 607 nm, 640 nm

Emission Cross-section

20 x 10^-19 cm²

Fluorescence Lifetime

50 µs

Standard Fabrication Specifications

Parameter

Specification

Orientation

Np-cut, Nm-cut, and other orientations available.

Clear Aperture

>90%

Length Tolerance

±0.1 mm

Surface Flatness

λ/10 @ 632.8 nm

Surface Quality

20-10 scratch/dig

LIDT

>10 J/cm² @ 1040 nm, 10 ns

Spectrum Transmission Curve:

The absorption and emission spectra of Yb:KYW Crystals display strong peaks at 980 nm and 1030 nm, respectively, ensuring efficient energy conversion and high performance in laser systems.

Coating Specification:

 

Custom anti-reflective (AR) coatings are available, optimized for:

  • 970–1070 nm wavelengths with R < 0.5%.
    Uncoated options are also provided 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) is a leading supplier of premium laser crystals, specializing in advanced fabrication and customization. With state-of-the-art facilities and expertise, we deliver solutions tailored to the needs of researchers and industry professionals globally. Key strengths include:

  • Customized doping and crystal dimensions.
  • Precision fabrication ensuring minimal losses.
  • Expertise in AR coatings for optimal performance.

Standard Products

Face Dimensions

Length

End Faces

Doping

Coatings

Price (USD)

3 × 3 mm

5 mm

Brewster-angle cut

2%

AR@970–1070 nm

540

5 × 5 mm

5 mm

Right-angle cut

10%

AR@970–1070 nm

590

Customizable

Custom

Customizable

Up to 10%

Customizable

Upon Request

POC-OC-122452-Yb KYW Crystal

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