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Etalon Tutorial

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Etalon Tutorial

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A Solid Etalon Filter (SEF) is used to select a periodically spaced frequency grid from a broad spectral range. The key specifications of these filters are Free Spectral Range (FSR), and Finesse. The FSR of a SEF is equal to the spacing between the transmittance peak frequencies. The finesse is said to describe the sharpness of the transmittance peaks and is equal to the FSR divided by the full width at half maximum (FWHM) of the transmittance peak frequencies.

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