= Ruby laser
{wiki}
A <ruby laser> uses <chromium> <ions> in <ruby> as its amplifying medium. Maiman's report identifies a metastable state fed by optical excitation and red emission near $694.3\,\mathrm{nm}$.<Stimulated Optical Radiation in Ruby by Theodore Harold Maiman>[Stimulated Optical Radiation in Ruby, opening and level-scheme paragraphs]{ref} The pump stores excitation in the medium; <stimulated emission> transfers it into the optical field. The simplified <three-level laser rate equation> explains why the stored population and the output pulse evolve together.
Back to article page
