A low-finesse Fabry–Pérot interferometer for use in displacement measurements with applications in absolute gravimetry
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- D’Agostino, G., Robertsson, L., Zucco, M. et al. Appl. Phys. B (2012) 106: 829. doi:10.1007/s00340-011-4747-1
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A low-finesse Fabry–Pérot interferometer is used to determine long and fast displacements. Two corner cube reflectors form the traveling-wave cavity and one beam splitter couples the input collimated laser beam. Given the retro-directive property of corner cube reflectors, the cavity operates at the edge of stability over an extended scanning range. The in-line scheme with a single fixed optical component makes the proposed interferometer robust and easy to align and use. These characteristics are particularly useful in applications running in noisy environments, such as in on-field absolute gravimetry. Experimental data showing the performances reached in a transportable ballistic gravimeter are also presented.