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Free spectral range (FSR) is the spacing in optical frequency or wavelength between two successive reflected or transmitted optical intensity maxima or minima of an interferometer or diffractive optical element.[1]
The FSR is not always represented by or , but instead is sometimes represented by just the letters FSR. The reason is that these different terms often refer to the bandwidth or linewidth of an emitted source respectively.
^Hecht, Eugene (2017). Optics (5th ed.). pp. 431–433, 614. ISBN 9780133977226. OCLC 953709783.
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