 Etalon Tutorial by Iridian Spectral Technologies

Primary source: iridian.com.cn/en/learning_center/etalon-tutorial-dup/

Verified locator: Manufacturer tutorial, Free Spectral Range and Finesse sections: adjacent transmittance peak frequency spacing, constant-index normal-incidence inverse-thickness relation, and distinction between spacing and peak FWHM. Its displayed plate relation explicitly neglects spacer dispersion. No individual byline or publication date is displayed.