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Erbium doped Yttrium Aluminum Garnet (Er:Y3Al5O12
or Er:YAG) combine various output wavelength with the superior thermal
and optical properties of YAG. It is an excellent laser crystal which
lasers at 2.94μm. This wavelength is the most readily absorbed into
water and hydroxylapatite of all existing wavelengths and is considered
a highly surface cutting laser. It is a well known material for medical
applications.
Material Properties of Er:YAG crystal
|
Chemical formula |
Er3+:Y3Al5O12 |
|
Crystal structure |
cubic |
|
Melting point: |
1970 �C |
|
Density, g/cm3 |
5,35 |
|
Mohs hardness |
8.5 |
|
Thermal expansion coefficient |
9,5 x 10-6 K-1 (a axis)
4,3 x 10-6 K-1 (b axis)
10,8 x 10-6 K-1 (c axis) |
|
Thermal conductivity at 25�C |
0.12 W x cm-1 x �K-1 |
|
Loss coefficient at 1064 nm |
0.003 cm-1 |
Laser Properties
|
Laser Transition |
4I11/2
to 4I13/2 |
|
Laser Wavelength |
2940nm |
|
Fluorescence Lifetime |
90 m s |
|
Photon Energy |
6.75�10-20J(@2940nm)
|
|
Emission Cross Section |
3�10-20cm2 |
|
Index of Refraction |
1.79 @2940nm |
|
Pump Bands |
600~800 nm |
Standard specifications
|
Dopant concentration, at.% |
Up to 50 |
|
Orientation:
|
<111>within 5� |
|
Flatness |
< λ/10 measured at 633 nm |
|
Parallelism |
≤ 30" |
|
Perpendicularity |
≤ 5 ′ |
|
Surface Quality |
10-5 per scratch-dig MIL-O-13830A |
|
Optical Quality: |
Interference fringes ≤ 0.125 λ /inch(@1064nm) |
|
Extinction ration |
≥ 25dB |
|
Size: |
Rods:Ф (3-10)mm �(30-180)mm |
|
Slabs: |
(3-12)mm �(6-24)mm �(60-180)mm |
|
Dimensional tolerances |
Diameter:+0.000"/-0.05",
Length: � 0.05"
Chamfer: 0.07+0.005/-0.00" at 45� |
|
AR Coating Reflectivity |
≤ 0.2% (@2940nm) |
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