Answer to Question #155617 in Optics for Huzaifa Rehman

Question #155617

What is the physical significance (importance) of free spectral range (δνr) of the resonator in real laser systems?




1
Expert's answer
2021-01-19T07:11:04-0500

the free spectral range 

For a resonator, it is the frequency spacing of the modes of the axial resonator. The free spectral range is inversely proportional to an optical pulse's round-trip time. 

For a Fabry–Pérot interferometer, it is the frequency used to spacing the system's peaks of transmission. When the extensive free spectral range is more, it leads to a bandwidth that is larger for a resonator bandwidth spectral resolution that is poor.



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