EOSAM 2022
Open Access

Figure 7


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Principle of measurement of birefringence with channeled spectrum analysis, in the general case of birefringence dispersion. The free spectral range (FSRσ), i.e., the spatial frequency difference between two successive bright channels, depends on group birefringence Bg: it is equal to 1/(Bg · Lf). Theoretically, the position of the bright channels does depend on phase birefringence B, but there is no mean to measure it, since the channel order m cannot be known precisely without access to all orders down to zero frequency (grey line channel).

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