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Displacement Interferometry in Passive Fabry-Perot Cavity
Lazar, Josef ; Číp, Ondřej ; Oulehla, Jindřich ; Pokorný, Pavel ; Fejfar, Antonín ; Stuchlík, Jiří
We present techniques oriented to improvement of precision in incremental interferometric measurements of displacements over a limited range where the atmospheric wavelength of the coherent laser source is either directly stabilized to a mechanical reference or is corrected to fit to the reference. This may represent a reduction of uncertainty linking the laser wavelength not to indirectly evaluated refractive index but to the setup mechanics which cannot be completely eliminated. Here we suggest an approach where the traditional interferometers are replaced by a passive Fabry-Perot cavity with position sensing using an intracavity transparent photodetector.

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