Crystals Materials
Er:YAG Crystals applications for 2.0 µm Medical Laser
  • Tm Concentration: 0.5~5 at.%
  • 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
  • One of the most notable features of Tm:YAG crystal is its ability to emit laser light in the 2 μm wavelength range, which is highly desired for applications such as laser surgery, remote sensing, and laser pumping of other lasers. Tm:YAG can also be used to generate laser light at longer wavelengths (up to 2.3 μm ) by tuning the laser cavity, making it useful for spectroscopy and other research applications.

    Specifications of Er:YAG Crystal
    Tm Doping (atm%) 0.5~5 at%
    Orientation [111] <5°
    Surface Quality 10/5 S/D
    Parallelism < 10″
    Perpendicularity < 5'
    Clear Aperture > 90%
    Wavefront Distortion ≤ 0.125λ/25 mm @632.8 nm
    Surface Flatness < λ/8 @ 632.8 nm
    Chamfer < 0.15±0.05 mm
    Coating AR: ≤0.25% @2μm
    Physical and chemical properties
    Chemical Formula Tm:Y3Al5O12
    Crystal Structure Cubic
    Lattice Constant 12.01 Å
    Density 4.56 ± 0.04 g/cm³
    Melting Point 1970°C
    Thermal Conductivity 14 W/m/K @ 20°C
    Specific Heat 0.59 J/g/K
    Thermal Optical Coefficient (dn/dT) 7.3×10^-6/K
    Hardness (Mohs) 8.5
    Young’s Modulus (GPa) 317
    Shear Modulus (GPa) 310
    Extinction Ratio 25 dB
    Poisson Ratio 0.25
    Thermal Shock Resistance 790 W/m
    Optical properties
    Laser Transition 3F4 → 3H6
    Laser Wavelength 1.87~2.16 μm
    Temperature Dependence of Refractive Index 7.3 × 10^-6/K
    Absorption Cross Section 7.5 × 10^-21 cm^2
    Diode Pump Band 785 nm, 680 nm
    Emission Cross Section @2013 nm 2.9 × 10^-20 cm^2
    Fluorescence Lifetime 11 ms
    Refractive Index @632 nm 1.83

    Stock specification list

    If need other specifications and quantities products, please contact us(
    Part Number Face size Length Doping, atm.% End Faces Coating
    Tm-YAG-001 3.0*3.0 mm 8.0 mm 3 Right-angle cut AR/AR@792 nm+ 1800-1960 nm
    Tm-YAG-002 3.0*3.0 mm 8.0 mm 3 Brewster cut Uncoated


  • 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:YAG 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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