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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. The FSR is not always represented by or , 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. == In general == The free spectral range (FSR) of a cavity is given by: : Where is the length of the cavity, is the group index of the media within the cavity and is the speed of light. In wavelength, the FSR is given by: : Where is the vacuum wavelength of light in the cavity. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Free spectral range」の詳細全文を読む スポンサード リンク
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