ErYAG

Er:YAG crystal is an excellent laser crystal which lasers at 2.94μm. This wavelength is the most readily absorbed into water and hydroxylapatite of all existing wavelengths and is considered a highly surface cutting laser. It is a well known material for medical applications

Advantages:


1. High slope efficiency
2. Operate well at room temperature
3. Operate in a relatively eye-safe wavelength range

Specifications

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

Main Properties of Er:YAG crystal:

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