Crystals Materials

Tm:YLF Crystals

for aerospace, medical, and industrial applications
tm-ylf-laser-crystal
  • Tm Concentration: 2% ~ 12%
  • 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

    • Tm:YLF laser crystal has low non-linear refraction index value and thermo optical constants, which makes Tm:YLF crystal applicable in research, development, education, production, photonics, optic, laser technology and telecommunications.

    Specifications of Tm:YLF Crystal

    Material Tm:LiYF4
    Doping 2% ~ 12%
    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
    Damage Threshold 750mW/cm2 at 1064 nm, TEM00, 10 ns, 10Hz

    Physical and chemical properties

    Crystal Structure Tetragonal
    Lattice Constant a=5.16Å; c=10.85Å
    Density 3.99 g/cm³
    Melting Point 819℃
    Thermal Conductivity 6 Wm-1K-1
    Thermal Optical Coefficient(dn/dT) π = 4.3 x 10-6 x °K-1; σ = 2.0 x 10-6 x °K-1
    Thermal Expansion (10-6·K-1@25°C ) 10.1×10-6 (//c) K-1, 14.3×10-6((//a) K-1
    Hardness (Mohs) 5
    Shear Modulus (Gpa) 85
    Specific Heat 0.79 J/gK
    Poisson Ratio 0.3

    Optical properties

    Laser Transition 3F4 → 3H6
    Laser Wavelength π: 1880 nm; σ: 1908 nm
    Absorption Cross-section at Peak 0.55×10-20 cm2
    Absorption Bandwidth at Peak Wavelength 16 nm
    Absorption Peak Wavelength 792 nm
    Lifetime of 3F4 Thulium Energy Level 16 ms
    Quantum Efficiency 2
    Non-linear Index n2 0.6 x 10-13
    Optical Quality < 0.3 x 10-5
    Refractive Index @1064 nm no=1.448, ne=1.470
    Laser Induced Damage Threshold > 10 J/cm2 @1900 nm, 10 ns
    Coatings R<0.5% @792 nm + R<0.15% @1800-1960 nm on both sides

    Stock specification list

    If need other specifications and quantities products, please contact us(sales@aogcrystal.com).
    Part Number Face size Length Doping, atm.% End Faces Coating
    Tm-YLF-001 Φ3.0 mm 6.0 mm 3.0 Right-angle cut AR(R<0.5%)792 nm + AR(R<0.2%)1800-1960 nm
    Tm-YLF-002 3.0*3.0 mm 8.0 mm 3.0 Brewster cut Uncoated
    Tm-YLF-003 3.0*3.0 mm 8.0 mm 3.0 Right-angle cut AR/AR@792 nm+ 1800-1960 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 Tm:YLF laser rod, please specify the specification listed above, for common application, we only need to know the main specification: Tm-dopant concentration, sizes, and coating. For special request, please specify specification in details for evaluation and fabrication.

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