Meaning & use
Etalon
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An optical device, typically consisting of two parallel reflective surfaces, used to measure wavelengths of light with high precision.
See it in a sentence
The laser's frequency was stabilized using a Fabry-Pérot etalon.
Researchers calibrated the spectrometer with a reference etalon.
A note on using this word
From the French word 'étalon,' meaning standard or gauge, reflecting the device's role in precise measurement.
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