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The wavelength of carbon dioxide laser usually emit at a wavelength of 10.6 μm.
A ruby laser is a red laser with a wavelength between 694 nm and 628 nm. 1 nanometer = 1×10−9 meter.
Millimeter and it shows the wavelength of the laser.
nm means nanometer, that being the wavelength of that laser.
Power applied to laser, wavelength & angle of viewing it.