Technical Center: Laser Glossary of Terms
Abbreviation for Transverse Electromagnetic Modes. Used to designate the cross-sectional shape of the beam. The radial distribution of intensity across a beam as it exits the optical cavity.
The lowest order mode possible with a bell-shaped (Gaussian) distribution of light across the laser beam.
Thermal Relaxation Time
The time to dissipate the heat absorbed during a laser pulse.
The input level at which lasing begins during excitation of the laser medium.
Passage of electromagnetic radiation through a medium.
The ratio of transmitted radiant energy to incident radiant energy, or the fraction of light that passes through a medium.
Tunable Dye Laser
A laser whose active medium is a liquid dye, pumped by another laser or flashlamps, to produce various colors of light. The color of light may be tuned by adjusting optical tuning elements and/or changing the dye used.
A laser system that can be "tuned" to emit laser light over a continuous range of wavelengths or frequencies.