Erbium doped yttrium aluminum garnet
Material
Er:YAG
Erbium doped Yttrium Aluminum Garnet (Er:Y3Al5O12 or Er:YAG) laser crystals have a great advantage in the wavelength range of 2.94 µm, where the laser beam is strongly absorbed in water and therefore interesting in medicine. Er:YAG has high optical quality, low scattering loss, large output power and is chemically as well as mechanically stable. This makes it ideal for hard tissue removal. Er:YAG is a crystal with a wide pumping range from 600nm to 800nm. All these properties make Er:YAG ideal for applications in surgery, dentistry and other medical fields.
Properties
Optical and spectral properties | |
|---|---|
Lasing wavelength in nm | 2940 |
Refractive index @ 2940 nm | 1,79 |
Damage threshold in MW/cm2 | >500 |
Fluorescence lifetime in ms | 0,23 (high doped) 2 ∼ 5 (low doped) |
Physical properties | |
|---|---|
Density in g/cm3 | 5,35
|
Melting point in °C
| 1970
|
Crystal structure | cubic |
Thermal conductivity in W/(cm · K) | 0,12
|
Thermal expansion in 1/K | 7,7 · 10-6, <111> 8,2 · 10-6, <100> |
Mohs hardness | 8,5 |
Dopant concentration in % | 0,15 ‐ 50 |
Lattice constant in Å | 12,0 |
Dielectric constant | 11,7 |
Young's Modulus (E) in Gpa | 317 |
Shear Modulus (G) in GPa | 54,7 |
Poisson's ratio | 0,25 |
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