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Pr:YLF Crystal

POC-OC-122444-Pr:YLF Crystal

  • High absorption and emission cross-sections (~10^-19 cm²).
  • Exceptional overlap with InGaN laser diode and 2ω-OPSL emission lines.
  • Customizable configurations available upon request.
  • Excellent thermal and mechanical stability for high-power applications.
  • Wide emission range for visible and UV lasers.

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

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Pr:YLF Crystal Material General Description

Praseodymium-doped Lithium Yttrium Fluoride (Pr:YLF) crystal is a robust and versatile material for producing visible solid-state lasers. With its high absorption cross-section in the blue spectral region and overlapping emission lines of InGaN diodes, Pr:YLF  is widely used for both research and industrial applications. The material features excellent thermal conductivity and a tetragonal structure, providing stability under high-power operations. The unique energy level transitions of Pr³⁺ allow generation of red, orange, green, and blue lasers, making it ideal for multicolor and high-intensity laser systems.

 

Pr:YLF Crystal General Applications and Examples

Pr:YLF crystals are essential for diode-pumped solid-state lasers and have a broad spectrum of applications, such as:

  • Industrial Applications: Efficient processing of metals like copper or gold, precision machining, and material marking.
  • Scientific Research: Generation of multicolor lasers for spectroscopy and imaging.
  • Entertainment: Laser shows with visible colors from red to blue.
  • Medical Technology: High-precision laser tools for diagnostics and surgery.
  • UV Laser Generation: Pr:YLF supports second harmonic generation (SHG) to produce ultraviolet laser light.

Pr:YLF crystals are particularly advantageous for lasing in the visible spectrum, with transitions at:

  • Red: 640 nm
  • Orange: 607 nm
  • Green: 523 nm
  • Blue: 480 nm

These unique properties make Pr:YLF Crystal  indispensable for visible laser generation directly from solid-state systems.

Chemical and Structural Properties

Property

Value

Chemical Formula

Pr³⁺:LiYF₄

Crystal Structure

Tetragonal

Refractive Index (at 1064 nm)

n_o = 1.448, n_e = 1.470

Density

3.95 g/cm³

Mohs Hardness

5

Thermal Conductivity

6 W/m·K

Thermal Expansion Coefficient

-1.6 x 10^-6 /K

Typical Doping Level

<1.3%

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

Specification

Value

Orientation

c-cut

Clear Aperture

>90%

Face Dimensions Tolerance

+0.0/-0.1 mm

Length Tolerance

±0.1 mm

Surface Quality (Scratch/Dig)

20-10

Surface Flatness

λ/8 @ 633 nm

Parallelism Error

<20 arcsec

Perpendicularity Error

<10 arcmin

Chamfer

<0.1 mm at 45°

Laser Damage Threshold

>5 J/cm² @ 532 nm, 10 ns

Spectrum Transmission Curve:

The  transmission spectrum is available, showing high absorption and emission peaks at visible wavelengths, particularly in the red, green, and blue regions. This curve confirms the crystal’s efficiency for multicolor laser operations.

Coating Specification:

 

  • Standard Coatings:
    • AR coating for 444-725 nm on both faces.
    • Reflectivity: <0.2% across the operational wavelength range.
  • Custom Coatings: Available upon request for optimized performance in specific 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) specializes in producing high-quality Pr:YLF crystals with precise doping levels and optimized physical properties. POC offers a range of standard and custom crystal configurations, ensuring that every product meets the highest performance standards. With a dedicated research and development team, POC ensures continuous innovation and supports clients with custom designs for their laser applications.

Standard Products

Face Dimensions (mm)

Length (mm)

End Faces

Doping (%)

Coatings

Price (USD)

2 x 2

6

Right-angle cut

0.5

AR @ 440-725 nm

480

3 x 3

6

Right-angle cut

0.5

AR @ 440-725 nm

540

5 x 5

6

Right-angle cut

0.5

AR @ 440-725 nm

640

Custom Size

Upon Request

Brewster/Right Cut

Upon Request

Custom coatings available

Upon Request

POC-OC-122444-Pr YLF Crystal

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