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Er YAG Laser Crystals

Er YAG Laser Crystals 2019-11-17T00:00:45+00:00

Erbium doped Yttrium Aluminum Garnet (Er: YAG) is a light green crystal with various output wavelengths. Typically, approximately 50% Yttrium atoms replaced with highly doped Er: YAG, Erbium are used as laser media for the wavelength of 2940 nm. This wavelength is due to the strong water and human body fluid absorption. Er: YAG laser has a wide range of dental and medical applications.

Explanation

Erbium doped Yttrium Aluminum Garnet (Er: YAG) is a light green crystal with various output wavelengths. Typically, approximately 50% Yttrium atoms replaced with highly doped Er: YAG, Erbium are used as laser media for a wavelength of 2940 nm. Due to the strong absorption of water and human body fluid at this wavelength, the Er: YAG laser has a wide range of dental and medical applications. For example, low doped Er: YAG (about 0.1-1%) Yttrium atoms are replaced, high power 1600 nm does not harm the eyes. Excellent optical and mechanical properties and a 600 ~ 800 nm wide pump band make the Er: YAG an ideal laser crystal.

 % 50 Er 3+ Absorption Spectrum: YAG crystal

Specifications

● Works in a relatively eye-safe wavelength zone

● Strongly absorbed by water, hydroxyapatite and human body fluid.

● Pump band wider than 600 ~ 800 nm

● Works well at room temperature

● High slope efficiency

● Good optical quality

Applications

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

● Dental laser systems including tooth enamel, cosmetic surgery

Chemical and physical properties

feature value
Chemical formula Er 3+ : Y 3 Al 5 O 12
Crystal structure cubic- la3d
Cage parameters 12.01Å
Density 4.56-5.11 g / cm 3
Melting point 1950 ° C
Refractive index 1.7838@2940nm
Thermal Conductivity / (W · cm -1 · K -1 @ 25 ° C) 0.14
Specific Heat/ (J · g -1 · K -1 ) 0.59
Thermal Expansion/ (10 -6 / ° C @ 25 ° C) 7.8
Hardness (Mohs) 8.5
Young Module/ GPa 317
Cutting Module / GPa 54.66
Damping Ratio/ dB 30
Orientation [100] veya [111] <± 0.5 °
Poisson’s ratio 0.25

Laser properties

feature value
concentrations 50 at. (High additive); % 0,1 ~ 1 (low additive)
Laser Switch 4I 11/2 → 4I 13/2 (highly doped)
4I 13/2 → 4I 15/2 (low additive)
Emission wavelength 2940 nm (highly doped)
1645 nm (low additive)
Pump wavelength 600 ~ 800 nm (highly doped)
1530 nm (low additive)
Fluorescence life 0.23 ms (highly doped)
2 ~ 5 ms (low additive)
laser cross section, σl(E -20 cm 2 ) 3
coatings <% 0.25 @ 2940 nm

Polishing properties

feature value
Orientation tolerance <0,5 °
Thickness / Diameter Tolerance ± 0,05 mm
Surface Flatness <λ / 832 nm
Ripple Distortion <λ / 4 @ 632 nm
Surface quality 05/10
Parallel 10 “
Perpendicular 5′
Open aperture >% 90
groove <0.1 x 45 °

Standard products

Additive concentration dimensions covering Surface quality
% 50. Diameter: 3 ~ 6mm, Length: 50 ~ 120 mm <0.25%@2940nm 05/10
% 0,1 ~ 1 Diameter: 3 ~ 6mm, Length: 50 ~ 120 mm <0.25%@2940nm 05/10
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