Er: YAG Crystals

  • Coefficient of Thermal Expansion: 6.14 x 10-6 K-1
  • Crystal Structure: Cubic
  • Thermal Diffusivity: 0.041 cm2 s-2
  • Molecular Weight: 593.7 g mol-1
  • Melting Point: 1965°C
  • MOHS Hardness: 8.25
  • Product Detail

    Technical parameters

    Test report


    Er: YAG is a kind of excellent 2.94 um laser crystal, widely used in laser medical system and other fields. Er: YAG crystal laser is the most important material of 3nm laser, and the slope with high efficiency, can work at room temperature laser, laser wavelength is within the scope of the human eye safety band, etc. 2.94 mm Er: YAG laser has been widely used in medical field surgery, skin beauty, dental treatment.
    Advantages of Er:YAG Crystals:
    • High slope efficiency
    • Operate well at room temperature
    • Operate in a relatively eye-safe wavelength range

    Basic Properties of Er:YAG

    Coefficient of Thermal Expansion 6.14 x 10-6 K-1
    Crystal Structure Cubic
    Thermal Diffusivity 0.041 cm2 s-2
    Thermal Conductivity 11.2 W m-1 K-1
    Specific Heat (Cp) 0.59 J g-1 K-1
    Thermal Shock Resistant 800 W m-1
    Refractive Index @ 632.8 nm 1.83
    dn/dT (Thermal Coefficient of Refractive Index) @ 1064nm 7.8 10-6 K-1
    Molecular Weight 593.7 g mol-1
    Melting Point 1965°C
    Density 4.56 g cm-3
    MOHS Hardness 8.25
    Young’s Modulus 335 Gpa
    Tensile Strength 2 Gpa
    Lattice Constant a=12.013 Å

    Technical parameters

    Orientation [111] within 5°
    Wavefront Distortion ≤0.125λ/inch(@1064nm)
    Extinction Ratio ≥25 dB
    Rod Sizes Diameter:36mm, Length:50120 mm (Upon request of customer)
    Dimensional Tolerances Diameter:+0.00/-0.05mm, Length: ± 0.5mm
    Parallelism ≤10″
    Perpendicularity ≤5′
    Flatness λ/10 @632.8nm
    Surface Quality 10-5(MIL-O-13830A)
    Chamfer 0.15±0.05mm

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