contain four primary components regardless of style, size
The active medium may be solid crystals such as ruby or Nd:YAG,
liquid dyes, gases like CO2 or Helium/Neon, or semiconductors
such as GaAs. Active mediums contain atoms whose electrons
may be excited to a metastable energy level by an energy source.
Excitation mechanisms pump energy into the active medium by
one or more of three basic methods; optical, electrical or
High Reflectance Mirror
A mirror which reflects essentially 100% of the laser light.
Partially Transmissive Mirror
A mirror which reflects less than 100% of the laser light
and transmits the remainder.