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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 25C

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

6.7510-20J(@2940nm)

Emission Cross Section

310-20cm2

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)

 
 Nd:YAG rod      Nd:YVO4       KTA      (Nd, Ce):YAG        Yb:YAG      Cr4+:YAG       KTP       LBO     BBO

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