Crystals Materials

Cr4+:YAG Crystals

for aerospace, medical, and industrial applications
cr4-yag-crystal
  • Passively Q-switched lasers for laser rangefinders, LIDAR, and LIBS systems
  • Laser systems where short pulses are required
  • 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

    • Chromium-doped Yttrium Aluminum Garnet (Cr4+:YAG) Passive Q-Switched Crystals be applied to passively Q-switching diode pumped of Nd:YAG, Nd:YLF, Nd:YVO4 lasers at wavelength from 0.8 to 1.2 µm.

    Specifications of Cr4+:YAG Crystal

    Property Value
    Orientation [100] or [110]
    Initial absorption coefficient 0.1~8.5 cm-1 @1064 nm
    Initial transmission 3%~98%
    Wavefront distortion <λ/8 @ 632.8nm
    Thickness/Diameter Tolerance ±0.05 mm
    Surface Flatness <λ/10 @ 633 nm
    Surface quality 10/5 per MIL-O-13830A
    Parallelism < 10 arcsec
    Perpendicularity 10 arcmin
    Clear Aperture > 90%
    Chamfer < 0.2 mm @ 45°
    Coating AR/HR/PR coating

    Physical and chemical properties

    Property Value
    Chemical Formula Cr4+:Y3Al5O12
    Crystal Structure cubic - la3d
    Lattice Parameter 12.01 Å
    Mass Density 4.56 g/cm3
    Melting Point 1970°C
    Mohs Hardness 8.5
    Young's Modulus 335 GPa
    Tensile Strength 2 GPa
    Thermal Conductivity 0.1213 W/m/K
    Specific Heat 0.59 J/g/K
    Thermal Shock Resistance Parameter 800 W/m
    Thermal Expansion 7.7 - 8.2 × 10-6/°C @ 25°C
    Extinction Ratio 25 dB
    Refractive Index @1064 nm 1.83
    Charge Compensating Ion Ca2+, Mg2+

    Optical properties

    Property Value
    Optical Density 0.1 to 0.8
    Fluorescence Lifetime 3.4 μs
    Concentrations 0.5 mol % ~ 3 mol %
    Emission Wavelength 1350 nm ~ 1600 nm
    Absorption Coefficient 1.0 cm-1 ～ 7 cm-1
    Ground State Absorption Cross Section 4.3×10-18 cm2
    Emission State Absorption Cross Section 8.2×10-19 cm2
    Transmission 10% to 90%
    Damage Threshold > 750 MW / cm2

    Stock specification list

    If need other specifications and quantities products, please contact us(sales@aogcrystal.com).
    Part Number Face size Initial Transmission @1064 nm Coating
    Cr4-YAG-001 Ø5 mm T0=30%~95% AR/AR@1064 nm
    Cr4-YAG-002 3.0*3.0 mm T0=30%~95% AR/AR@940+1030 nm
    Cr4-YAG-002 5.0*5.0 mm T0=30%~95% AR/AR@940+1030 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 Cr4+:YAG laser rod, please specify the specification listed above, for common application, we only need to know the main specification: Cr4-dopant concentration, sizes, and coating. For special request, please specify specification in details for evaluation and fabrication.

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