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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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