A laser's output color depends primarily on
A) the power to it.
B) the energy gap between the upper and lower laser levels.
C) the energy gap between the lower laser level and ground state
D) how much lasing material is in the laser

Question

Quizplus · Accepted Answer

The color (wavelength) of a laser's output is determined by the energy gap between the upper and lower laser levels. This energy difference corresponds to the photon energy emitted, which directly relates to the color of the light according to the Planck-Einstein relation.

A Laser's Output Color Depends Primarily on