Er YAG Laser Crystals / Laser Material 1950°C Melting Point 12.01 Lattice

Works in a relatively eye-safe wavelength region

Strongly absorbed by water, hydroxyapatite and human body fluid

Wide pump band from 600~800 nm

Works well under room temperature

High slope efficiency

Good optical quality

Applications

Medical laser systems including skin disorder therapy, hard tissue removal, blood sugar monitoring, orthopedics

Dental laser systems including tooth enamel, cosmetic surgery

Property

Value

Chemical formula

Er3+:Y3Al5O12

Crystal structure

cubic - la3d

Lattice parameters

12.01

Density

4.56-5.11 g/cm3

Melting Point

1950°C

Refractive Index

1.7838@2940nm

Thermal Conductivity /(Wcm-1K-1 @25°C)

0.14

Specific Heat/ (Jg-1K-1)

0.59

Thermal Expansion /(10-6 /°C @25°C)

7.8

Hardness (Mohs)

8.5

Young`s Modulus /GPa

317

Shear Modulus / GPa

54.66

Extinction Ratio / dB

30

Orientation

[100] or [111] < ±0.5°

Poisson Ratio

0.25

Property

Value

Concentrations

50 at.% (highly doped); 0.1~1 at.% (low doped)

Laser transition

4I11/2 4I13/2 (highly doped)
4I13/2 4I15/2 (low doped)

Emission wavelength

2940 nm (highly doped)
1645 nm (low doped)

Pump wavelength

600~800 nm (highly doped)
1530 nm (low doped)

Fluorescence lifetime

0.23 ms (highly doped)
2~5 ms (low doped)

laser transition peak cross section, l (E-20 cm2)

3

Coatings

< 0.25% @ 2940 nm

Value

Orientation Tolerance

< 0.5°

Thickness/Diameter Tolerance

±0.05 mm

Surface Flatness

</8 @632 nm

Wavefront Distortion

</4 @632 nm

Surface Quality

10/5

Parallel

10

Perpendicular

5

Clear Aperture

>90%

Chamfer

<0.1×45°