Er:YAG

Operate in a relatively eye-safe wavelength range

The Sellmeier equations (l in µm):
n ^2 = 2.08745 + 1.2081 l ^2 /(l^ 2 - 0.02119 )+ 17.2049 l ^2 /(l ^2 - 1404.45 )

Optical and Spectral Properties
Please view Laser crysals Properities

Specifications:

Orientation:	<111> or <100]> crystalline within 5°
Wavefront distortion :	L/8 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:	< l /10 @ 633 nm
chamfer:	<0.1 mm @ 45deg.
Barrel Finish:	50-80 micro-inch (RMS) ,
AR Coating Reflectivity	< 0.25%