= Order-safe angular scanning of a Fabry–Pérot spectrum
Spectral resolution and order identification are separate design constraints. An instrumental width narrower than a line separation does not prevent a different <interference> order from placing another <wavelength> at the same angle. Choose optical thickness so the source range fits a known order interval, sufficient <finesse> to resolve neighbouring lines, and an angular window or order-sorting filter to exclude unwanted orders. Material dispersion and the internal/external angle conversion must be calibrated.
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