Measurement of small rotations by eigenvector flips in a quasi-isotropic Fabry–Perot

Le Grand, Y.; Medjaou, M.; Le Floch, A.; Le Naour, R.
November 1987
Applied Physics Letters;11/16/1987, Vol. 51 Issue 20, p1574
Academic Journal
A novel small rotation or small birefringence measurement scheme based on the dynamics of the helicoidal eigenstates of a passive Fabry–Perot cavity with two quarter-wave plates is described. When the system is inserted between two crossed polarizers, the sensitivity of the method is shown to be proportional to the square of the finesse of the cavity. For a finesse of 50, the observed noise floor corresponds to an estimation of the minimum detectable small rotation of 3×10-8 rd. We discuss possible improvements and potential possibilities of the method.


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