1. Plural of etalon; optical devices consisting of two parallel, partially reflective surfaces that create interference patterns, used in spectroscopy and laser technology to measure wavelengths and filter light.
Usage: technical; physics

Examples

• The laboratory uses Fabry-Pérot etalons to achieve high spectral resolution in their measurements.
• Multiple etalons were stacked in the optical system to improve wavelength filtering.
• Etalons are essential components in many modern laser and spectroscopic instruments.
• The physicist calibrated the etalons before conducting the precision wavelength experiment.