Cr:YAG crystal, also known as chromium-doped yttrium aluminum garnet crystal, with the chemical formula of Cr: Y3Al5O12. It is a relatively excellent Q-switched crystal product.

It can be used not only as a Q-switch, but also as a gain medium because of its excellent physical and chemical properties. It is widely used in the field of passively Q-switched lasers of laser rangefinders, lidar and LIBS systems.

Cr: YAG has the advantages of chemical stability, durability, UV resistance, good thermal conductivity, great damage threshold (>500 mw/cm2) and simple operation. It is surpassing traditional materials such as LIF and organic dyes.

Cr: YAG is an excellent and widely used electro-optical material for passive Q-switched (laser diode or lamp pumped) Nd: YAG, Nd: YLF, Nd: YVO4 and other 0.8~1.2 μm Nd (or Yb) doped lasers. It is also an active medium for CW, pulse or self-mode-locked tunable NIR solid-state lasers. The tunable range is 1340 – 1580 nm and the working wavelength is 950-1100 nm.

The absorption saturation at 1060 nm band can be used in small Nd: YAG oscillators with flashlamp or laser diode pump, instead of dye or lif:f central passive Q-switch, so that Cr4+: YAG crystal can achieve self mode locking (KML) state. It provides an opportunity to build a laser source with a pulse duration shorter than 100 fs at 1450-1580 nm.

Features of Cr: YAG Crystal

  • Radiation stability
  • High thermal conductivity
  • High damage threshold (> 500 MW/cm2)
  • Excellent physical and chemical properties

Physical and Chemical Properties

Chemical FormulaCr4+:Y3Al5O12
Crystal Structurecubic – la3d
Lattice Constant Å12.01
Orientation[100] or [110] < ±0.5°
Mass Density4.56 g/cm3
Mohs Hardness8.5
Young's Modulus335 GPa
Tensile Strength2 GPa
Melting Point1970°C
Thermal Conductivity0.1213
Specific Heat/(J·g-1·K-10.59
Thermal Expansion/(10-6 /°C @ 25°C)7.8 <111>
7.7 <110>
8.2 <100>
Thermal Shock Resistance Parameters800 W/m
Extinction Ratio25dB
Poisson Ratio0.25
Refractive Index @ 1064 nm1.83
Charge Compensated IonCa2+, Mg2+

Optical Properties

Optical Density0.1 to 0.8
Fluorescence Lifetime3.4μs
Concentration0.5 mol % ~ 3 mol %
Emission Wavelength1350 nm ~ 1600 nm
Absorption Coefficient 1.0 cm-1~ 7 cm-1
Ground State Absorption Cross-section4.3×10-18 cm2
Emission Absorption Cross-section8.2×10-19 cm2
Transmission10% to 90%
CoatingAR≤ 0.2% @1064nm
Damage Threshold> 500 MW / cm2


Orientation Tolerance< 0.5°
Thickness/Diameter Tolerance±0.05 mm
Surface Flatness<λ/8@632 nm
Wavefront Distortion<λ/4@632 nm
Surface Quality5-Oct
Clear Aperture>90%
HR Coating<= 0.2% (@ 1340nm)
Biggest Size2*2-15*15 mm×20mm


Cr YAG Q-Switched crystal emission spectrum CRYLINKCr YAG Q-Switched crystal absorption spectrum CRYLINK
Cr YAG Q-switched crystal Other spectral1 CRYLINKCr YAG Q-Switched Crystal Other spectral2 CRYLINK


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