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Er:YAG
(Erbium Doped Yttrium Aluminum Garnet, Er:Y3Al5O12)
Er:YAG is an active laser medium with the laser emission occurs at
2940 nm. Its absorption bands suitable for pumping are wide and located
between 600 and 800 nm, allowing for efficient flashlamp or laser diode
pumping. The Er:YAG laser wavelength of 2940nm couples well into water and
body fluids, making this laser especially useful for medicine and dentistry
uses.
We can provide large ( aperture up to 10mm, length up to 120mm) Er:YAG
rods or slabs with the appropriate coatings.
Basic Properties
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Structure symmetry |
Cubic |
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Lattice constants |
12.00Å |
|
Melting point |
1970oC |
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Mohs hardness |
8.5 |
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Density |
5.35g/cm3 |
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Thermal conductivity |
14 W/m/K, 20oC |
|
Thermal expansion |
7.7x10-6/K
along <111>,
8.2x10-6/K
along <100> |
|
Refractive index |
n=1.79 @ 2940nm |
|
Thermo-Optic Coefficient ( dn/dT) |
7.3x10-6
/K |
|
Fluorescent lifetime |
~ 100 µs for
50% Er doping |
|
Emission cross section |
3 x 10-20/cm2 @
2940nm
|
|
Lasing wavelength |
2940nm |
|
Pump band |
600 - 800nm |
Standard Products
Er:YAG crystals are cut along the
<100> or <111>. The ends of the crystal are typically anti-reflection
coated at 2940nm.
Please contact Newlight for crystal sizes and
doping levels for your applications.
Specifications on
finished products
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Orientation: <100> or <111> |
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Er concentration ( at.%):
1-50% |
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Wavefront distortion: smaller than
λ/4
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Surface quality: better than
10/5 Scratch/Dig |
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Parallelism: < 10 arc seconds |
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Perpendicularity: < 5 arc minutes |
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Surface flatness: <λ/10
at 632.8nm |
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Clear aperture: Central 90% |
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Chamfer: 0.15mm x
45o |
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