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Tm:YLF Crystal

POC-OC-122459-Tm:YLF Crystal

  • Strong absorption bands optimized for laser diode pumping.
  • Weak thermal lensing for stable operation.
  • High polarization purity suitable for advanced laser designs.
  • Cross-relaxation process creates higher ion efficiency.
  • Custom crystal specifications available upon request.

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

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Tm:YLF Crystal Material General Description:

Tm:YLF (Thulium-doped Lithium Yttrium Fluoride) crystal is an advanced laser medium featuring high absorption peaks around 792 nm, making it ideal for laser diode pumping. Its unique cross-relaxation process doubles the number of ions in the upper laser level, enhancing the efficiency of each pump photon. Tm:YLF crystals are widely used as a pump source for Ho:YAG lasers due to the good overlap of their emission and absorption spectra. Additionally, the thermal refractive index of Tm:YLF decreases with temperature, leading to a negative thermal lens effect, which, when combined with end-face bulging compensation, ensures excellent beam stability and performance. This crystal’s superior polarization purity and stable operation make it ideal for high-precision applications.

Tm:YLF Crystal General Application and Examples:

Tm:YLF crystals are used in a variety of applications, including:

  • LiDAR Systems: Used in remote sensing for environmental monitoring and mapping.
  • Pump Source for Ho:YAG Lasers: Facilitates efficient energy transfer and polarized laser output.
  • Medical Lasers: Ideal for surgical and therapeutic applications requiring precise output and stability.
  • Industrial Lasers: Enables high-powered, efficient cutting and welding operations.
  • Defense Systems: Suitable for range-finding, target designation, and secure communication lasers.

By leveraging Tm:YLF Crystal  unique properties, these applications achieve high power output, precise targeting, and low thermal distortion, making this crystal indispensable in cutting-edge laser systems.

Chemical and Structural Properties

Property

Specification

Orientation

c-cut

Clear Aperture

>90%

Face Dimensions Tolerance

±0.1 mm

Length Tolerance

±0.1 mm

Parallelism Error

<20 arcsec

Perpendicularity Error

<10 arcmin

Protective Chamfers

<0.1 mm at 45°

Surface Quality

20-10 S-D

Surface Flatness

λ/10 @ 632.8 nm

Crystal Structure

Tetragonal

Density

3.99 g/cm³

Thermal Conductivity

6 W/m·K

Mohs Hardness

5

dn/dT

-4.6 x 10^-6 (°C)^-1

Typical Doping Level

2-4 at.%

Optical, Laser and Nonlinear Optical Properties

Optical Property

Specification

Absorption Peak Wavelength

792 nm

Absorption Cross-Section at Peak

0.55 x 10^-19 cm²

Absorption Bandwidth at Peak

~5 nm

Laser Wavelength

1900 nm

Lifetime of Tm³⁺ Energy Level

16 ms

Emission Cross-Section @ 1900 nm

0.4 x 10^-19 cm²

Refractive Index @ 1064 nm

nₒ = 1.448, nₑ = 1.446

Standard Fabrication Specifications

Specification

Value

Orientation

c-cut

Face Dimensions Tolerance

±0.1 mm

Surface Quality

20-10 S-D

Surface Flatness

λ/10 @ 632.8 nm

Parallelism Error

<20 arcsec

Protective Chamfers

<0.1 mm at 45°

Laser-Induced Damage Threshold (LIDT)

>10 J/cm² @ 1900 nm, 10 ns

Spectrum Transmission Curve:

  • Absorption and emission spectra have been optimized for diode pumping at 792 nm and laser output at 1900 nm. This data is critical for system design and alignment. 

Coating Specification:

 

Coating

Specification

Anti-Reflective Coating (AR)

R < 0.3% @ 792 nm and 1800-1960 nm

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) specializes in providing high-quality laser crystals tailored to advanced applications. With years of experience in manufacturing, POC delivers superior optical and thermal performance, enabling precision in high-power laser systems. Our state-of-the-art fabrication techniques ensure strict tolerances, superior coatings, and customizable designs for a wide range of applications, including LiDAR, medical, and industrial sectors. Partnering with POC ensures access to cutting-edge photonic solutions.

Standard Products

Face Dimensions

Length

End Faces

Doping

Coatings

Price (USD)

3 x 3 mm

8 mm

Brewster-angle cut

3%

Uncoated

540

3 x 3 mm

8 mm

Right-angle cut

3%

AR@792 nm + 1800-1960 nm

590

Custom Size

Custom

Upon Request

Custom

Upon Request

Custom Pricing

POC-OC-122459-Tm YLF Crystal

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