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er yag crystals
er yag crystals
er yag laser crystals

Er: YAG Laser Crystals

Erbium-doped Yttrium Aluminum Garnet (Er:YAG) is a pale green crystal with various output wavelength. Typically, highly doped Er:YAG, about 50% Yttrium atoms replaced by Erbium, is used as laser medium for 2940 nm wavelength. Due to the strong water and human body fluid absorption at this wavelength. Er:YAG laser has a wide dental and medical applications.

Applications of Er YAG Laser Crystals


  • Medical Cosmetology

  • Dental laser therapy apparatus

  • Er YAG Laser therapeutic apparatus

  • Skin laser therapy apparatus


Advantages of Er YAG Laser Crystals


  • Works in a relatively eye-safe wavelength region

  • High slope efficiency

  • Good optical quality

  • Operate well at room temperature


Specifications of Er YAG Laser Crystals


Dopant concentration

20at% and 50 at%

Orientation

[100] within 5°

Wavefront Distortion

≤0.125 λ/inch(@1064nm)

Optical Quality

Interference fringes ≤ 0. 125 /inch
Extinction ration Ø3~Ø6.35 ≥ 28db, Ø7~Ø10 ≥ 25dB

Size

Rods: Ø (3~10)mm×(30~180)mm (L)
Slabs: (3~12)mm×(6~24)mm×(60~180)mm (L)
Upon request of customer

Dimensional tolerances

Diameter: +0.00/-0.05mm
Length: ±0.5mm, chamfer :<0.15±0.05mm@45°

Parallelism

≤10"

Perpendicularity

≤5′

Flatness

λ/10 @632.8nm

Surface Quality

10-5(MIL-O-13830A)

AR Coating Reflectivity

≤ 0.25% (@2940nm)

Damage threshold

≥ 500MW/cm2 10ns 1Hz at 1064nm


Properties of Er YAG Laser Crystals


Crystal Structure

Cubic

Lattice Parameters

12.01 Å

Melting Point

1970℃

Moh Hardness

8.5

Density

4.56±0.04g/cm3

Specific Heat (0-20)

0.59J/g.cm3

Thermal Expansion Coefficient

[100]Direction:8.2×10-6/℃(0~250℃)

Thermal Conductivity

14W/m/K(@20℃)

10.5W/m/K(@100℃)

Laser Transition

4I11/2 to 4I13/2

Laser Wavelength

2940nm

Emission Cross Section

3×10-20 cm2

Index of Refraction

1.79 @2940nm


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