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Er:YAG
 

Er:YAG is an excellent laser crystal which lasers at 2.94μm. It has wide applications in medical laser systems, and others.
Very high slope efficiency.
Operates well at room temperature.
Operate in a relatively eye-safe wavelength range.
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Specification
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 / Dig per 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%

Note: The other specification and dimension is available too

The Sellmeier equations ( l in μm ):
n2 = 2.08745 + 1.2081 l2 /(l2 - 0.02119 )+ 17.2049 l2 /(l2 - 1404.45 )