Serie ET & ETA : The etalons are most commonly used as line-narrowing elements in narrowband laser cavities, and as bandwidth limiting and coarse tuning elements in broadband and picosecond lasers.
All etalons describe hereunder are planar fabry-perot type and classified as follows.
Air-spaced etalons : Pair of very flat plano-plano plates separated by optically contacted spacers
Solid etalons : Parallel sides plano-plano plates with partailly reflecting coatings on both sides.
Deposited Solid etalons : A special type of solid etalon in which the cavity is formed by a deposited layer of coating material
Applications:
- Laser line profile monitoring
- Diagnosis