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Nanometric sensing with laser feedback interferometry

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Abstract

We demonstrate a nanometric sensor based on feedback interferometry in a distributed feedback (DFB) laser by using a measurement of either the optical frequency or laser voltage. We find that in an optimal range of optical feedback, the sensor operates reliably down to an extrapolated 12 nm; for the sensor demonstrated here at 1550nm, this provides a minimum detectible displacement of λ/130.

© 2019 Optical Society of America

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