Cr:YAG
Our Cr⁴⁺:YAG, also called chromium-doped yttrium aluminum garnet, has the chemical formula Cr:Y₃Al₅O₁₂ and is a Q-switching crystal with good overall performance. Its excellent physical and chemical properties allow it to serve both as a Q-switch and as a gain medium. It is widely used in passively Q-switched lasers for laser rangefinders, LIDAR, and LIBS systems. Cr:YAG offers chemical stability, durability, ultraviolet resistance, good thermal conductivity, a high damage threshold (>500 MW/cm²), and simple operation, and is superseding conventional materials such as LiF and organic dyes. It is an excellent, widely used electro-optic material for passive Q-switching of laser-diode- or lamp-pumped Nd:YAG, Nd:YLF, Nd:YVO₄, and other Nd- or Yb-doped lasers over 0.8~1.2µm. It can also act as an active medium for CW, pulsed, or self-mode-locked tunable NIR solid-state lasers over 1340–1580nm and as a Q-switching medium in lasers operating at 950-1100nm. Absorption saturation in the 1060 nm band can be used in compact flashlamp- or laser-diode-pumped Nd:YAG oscillators instead of dye- or LiF:F-center-based passive Q-switches, enabling a self-mode-locked (KML) regime with Cr⁴⁺:YAG. This offers the opportunity to construct laser sources at 1450-1580nm with pulse durations shorter than 100fs.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Chemical formula | Cr⁴⁺:Y₃Al₅O₁₂ |
| Crystal Structure | cubic – la3d |
| Lattice parameters | 12.01 Å |
| Orientation | [100] or [110] < ±0.5° |
| Mass density | 4.56 g/cm³ |
| Mohs hardness | 8.5 |
| Young's modulus | 335 GPa |
| Tensile strength | 2 GPa |
| Melting point | 1970°C |
| Thermal conductivity | 0.1213 |
| Specific heat | 0.59 J·g⁻¹·K⁻¹ |
| Thermal expansion / (10⁻⁶ [@25°C）] | 7.8 <111> |
| Thermal expansion / (10⁻⁶ [@25°C）] | 7.7 <110> |
| Thermal expansion / (10⁻⁶ [@25°C）] | 8.2 <100> |
| Thermal shock resistance parameter | 800 W/m |
| Extinction ratio | 25dB |
| Poisson's ratio | 0.25 |
| Refractive Index [@1064 nm] | 1.83 |
| Charge-compensating ion | Ca²⁺, Mg²⁺ |
| Optical density | 0.1 to 0.8 |
| Fluorescence lifetime | 3.4μs |
| Concentration | 0.5 mol % ~ 3 mol % |
| Emission wavelength | 1350 nm ~ 1600 nm |
| Absorption coefficient | 1.0 cm⁻¹ ～ 7 cm⁻¹ |
| Transmission | 10% to 90% |
| Coating [@1064nm] | AR@1064nm |
| Damage Threshold | > 500 MW / cm² |
| Orientation tolerance | < 0.5° |
| Thickness / Diameter Tolerance | ±0.05 mm |
| Surface Flatness [@632 nm] | <λ/8@632 nm |
| Wavefront distortion [@632 nm] | <λ/4@632 nm |
| Parallel | 10〞 |
| Vertical | 5ˊ |
| Clear Aperture Dimension | >90% |
| Chamfer | <0.1×45° |
| HR Coating [@1340nm)] | <= 0.2% (@ 1340nm) |
| Maximum dimensions | 2*2-15*15 mm×20mm |
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Datasheet
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