Crystals Materials
Ho:YLF Crystals for Remote Sensing and Pollutant Detection Applications
ho-ylf-laser-crystal
  • Ho3+ Concentration: 0.2% ~3 atm%
  • Orientation: a-cut or c-cut
  • Surface Quality: 10/5 Scratch/Dig MIL-O-1380A
  • Parallelism: < 10″
  • Perpendicularity: < 5'
  • Clear Aperture: > 90%
  • Surface Flatness: < λ/10 @ 632.8 nm
  • Coating: AR/HR/PR coating upon customer's request
  • Quality Warranty Period: One year
  • Ho:YLF crystal (Holmium-doped:YAG) is a very attractive laser material, because the lifetime of the upper laser level is much longer ( ~ 14 ms) than in Ho:YAG and the emission cross sections are higher. Additionally the thermal lens in Ho:YLF is much weaker, which helps to generate diffraction limited beams even under intense end-pumping.

    Specifications of Ho:YLF Crystal
    Material Ho:LiYF4
    Diameter 3 ~ 10 mm
    Length 5 ~ 120 mm
    Doping 0.2% ~ 3 atm%
    Orientation a-cut or c-cut
    Dimension Tolerances ±0.05 mm
    Surface Quality 10/5 S/D
    Parallelism < 10 arcsec
    Perpendicularity < 5 arcmin
    Clear Aperture > 90%
    Wavefront Distortion λ/10 @ 633 nm
    Surface Flatness < λ/10 @ 632.8 nm
    Chamfer < 0.1 mm @ 45°
    Coating AR/HR/PR coating upon customer's request
    Physical and chemical properties
    Chemical Formula Ho3+:LiYF4
    Crystal Structure Tetragonal
    Lattice Constant 12.01 Å
    Density 3.95 g/cm3
    Melting Point 825 °C
    Thermal Conductivity 0.06 W/cm/K
    Thermal Optical Coefficient (dn/dT) 8×10-6/K
    Hardness (Mohs) 4 – 5
    Optical properties
    Laser Transition 5I7 → 5I8
    Absorption Cross Section 1.2×10-20 cm2
    Emission Cross Section 1.8×10-20 cm2
    Absorption Bandwidth at Peak Wavelength ~18 nm
    Absorption Peak Wavelength 1940 nm
    Laser Wavelength 2060 nm
    Lifetime of 5I7 Energy Level 10 ms
    Refractive Index @1.064 μm no=1.448, ne=1.470

    Stock specification list

    If need other specifications and quantities products, please contact us(sales@aogcrystal.com).
    Part Number Face size Length Doping, atm.% Orientation Coating
    Ho-YLF-001 Φ3.0 mm 30.0 mm 1.0 a-cut AR/AR@1900-2100 nm
    Ho-YLF-002 5.0*5.0 mm 2.0 mm 1.0 a-cut AR/AR@1900-2100 nm
    Ho-YLF-003 Φ8.0 mm 2.0 mm 1.0 a-cut AR/AR@1900-2100 nm

    Notes

  • Anti-reflection coatings are available at your specified wavelength.
  • Be sure to wear laser safety goggles when checking optical path and adjusting optical axis.
  • To inquiry or order a finished Ho:YLF laser rod, please specify the specification listed above, for common application, we only need to know the main specification: Ho-dopant concentration, sizes, and coating. For special request, please specify specification in details for evaluation and fabrication.
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