Why do all modes that differ by an integer multiple of the free spectral range (FSR) of the VIPA superimpose on each other at the VIPA output?

Khalil Eslami Jahromi @Khalil-Eslami-Jahromi

21 October 2016 0 7K Report

In the out put of VIPA, λ and λ+ n(FSR), n is integer number, overlap on each others. what is the reason? What is the role of FSR?

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