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Arrangements for monitoring wavelength stability. GG glass plates, M mirror, E1 and E2 étalons, L1 and L2 expanding lenses.
A typical result showing a wavelength change. Note that the finer rings appear to expand from top to bottom, the coarser lateral rings contract. Thus there must be a skipped order. The actual shifts must be in the ratio 15.01/8.66, the ratio of the étalon lengths. Orders are added or subtracted to the exact fractions until a concordant pair of shifts has been obtained.