| Issue |
J. Eur. Opt. Soc.-Rapid Publ.
Volume 4, 2009
|
|
|---|---|---|
| Article Number | 09023 | |
| Number of page(s) | 4 | |
| DOI | https://doi.org/10.2971/jeos.2009.09023 | |
| Published online | 21 May 2009 | |
Regular papers
Resonant two-beam interferometric sensor independent of intracavity losses
Institut de Physique de Rennes, UMR CNRS 6251, Université de Rennes 1, Campus de Beaulieu, 35042 Rennes, France
* marco.romanelli@univ-rennes1.fr
** marc.vallet@univ-rennes1.fr
Received:
3
April
2008
We study a resonant interferometric sensor with two cavity eigenstates. The finesse associated to one eigenstate is significantly lower than the empty cavity value, because of the presence of a lossy intracavity sample. We show theoretically that the sensitivity of the interferometer only depends on the empty cavity finesse when the low-finesse eigenfrequency is locked to resonance. This is experimentally demonstrated and a resolution of 60 pm is reported. Our method can be applied to any resonant two-beam interferometer.
Key words: interferometry / Fabry-Perot / locking / optical phase measurement
© The Author(s) 2009. All rights reserved.
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