Er:YAG
 



Er:YAG is an excellent laser crystal which lasers at 2.94µm. It has wide applications in medical laser systems, and others.

 

  1.  Very high slope efficiency

  2. Operates well at room temperature 

  3. Operate in a relatively eye-safe wavelength range

 

 

 

 
The Sellmeier equations (°C in µm for YAG):

n ^2 = 2.08745 + 1.2081 °l ^2 /(°l^ 2 - 0.02119 )+ 17.2049 °l ^2 /(°l ^2 - 1404.45 )

 

 

 

 

Optical and Spectral Properties

 

Dopant concentration

Er: ~50 at%

Laser Transition Transition

4 I 11/2 to 4 I 13/2 to 4 I 13/2

Laser Wavelength

2940nm

Photon Energy

6.75×10 -20 J(@2940nm)

Emission Cross Section

3×10 -20 cm 2

Index of Refraction

1.79 @2940nm

Pump Bands

600~800 nm

 

 

 

 

Specifications

 

Orientation:

<111> or <100> crystalline within 5°

Wavefront distortion :

1/8 lambda per inch @ 633 nm

Extinction Ratio:

>25dB

Dimension Tolerances

Rods with diameter: ±0.025 mm , Length: ±0.5 mm

Surface quality:

10/5 Scratch / Digper MIL-O-1380A

Parallelism:

< 10 arc seconds

Perpendicularity:

< 5 arc minutes

Flatness:

<1/10 lambda @ 633 nm

chamfer:

<0.1 mm @ 45deg.

Barrel Finish:

50-80 micro-inch (RMS) ,

AR Coating Reflectivity

< 0.25%

 

 

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