Free spectral range

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.

The FSR is not always represented by $\Delta\nu$ or $\Delta\lambda$ , but instead is sometimes represented by just the letters FSR. The reason is that these difference terms often refer to the bandwidth or linewidth of an emitted source respectively.

单词	Free spectral range
释义	Free spectral range 英语百科 Free spectral range 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. The FSR is not always represented by $\Delta\nu$ or $\Delta\lambda$ , but instead is sometimes represented by just the letters FSR. The reason is that these difference terms often refer to the bandwidth or linewidth of an emitted source respectively.
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