Rami Arieli: "The Laser Adventure" Chapter 6, Helium-Neon Lasers, page 5

Commercial He-Ne Lasers:

Wavelength:

632.8 [nm]

Output Power:

0.5-50 [mW]

Beam Diameter:

0.5-2.0 [mm]

Beam Divergence:

0.5-3 [mRad]

Coherence Length:

0.1-2 [m]

Power Stability:

5 [%/Hr]

Lifetime:

>20,000 [Hours]