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Ho:Cr:Tm:YAG
 

Ho:Cr:Tm:YAG is a high efficiency laser material which lasers at 2.1μm. It has wide applications in medical, military and meteorology fields.
May be flash lamp or diode pumped.
Very high slope efficiency.
Operates well at room temperature.
Operates in a relatively eye-safe wavelength range High efficiency.
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Specification
Orientation: <111> or <100> crystalline within 5°
Wavefront distortion: /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: < /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 )