= Etalon Tutorial by Iridian Spectral Technologies
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Primary source: https://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.
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