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Er:YAG

Laser Crystals ---------Er:YAG

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. It is a well known material for medical applications.

Advantages of Er:YAG Crystals

• High efficiency

• Operate well at room temperature

• Eye-safe wavelength

• Wide pump Bands(600-800nm)

Physical and Chemical Properties

　

　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, W x cm-1 x °K-1

0.12

　Loss coefficient at 1064 nm, cm-1

0.003

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

Er:YAG Standard Specification

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

　AR Coating Reflectivity

　≤ 0.25% (@2940nm)

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