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 |
| * Products designed by customer available | |||