Abstract
A tunable Fabry-Perot interferometer (FPI) can be used for high-resolution spectral measurements with precise control of the distance between the two FPI mirrors, which can be accomplished via feedback. We mechanically connect the FPI cavity mirrors to those of a shearing interferometer (SI) that is actively stabilized by a simple and inexpensive optical feedback method comprising a single HeNe laser, photodiode array, and Arduino microprocessor. The FPI transmission frequency can be held constant to within a standard deviation of 0.35 GHz for wavelengths in the near infra-red range. Scans of the transmission frequency are repeatable with a standard deviation of 0.11 GHz.
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