Frequency-Modulated Optical Feedback Interferometry for Nanometric Scale Vibrometry
We demonstrate a novel method that makes an efficient use of laser nonlinear dynamics when subject to optical self-injection for subwavelength displacement sensing purposes. The proposed methodology combines two different phenomena taking place inside the laser cavity: optical self-injection, which...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2016 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/90059 |
| Acceso en línea: | https://hdl.handle.net/2117/90059 https://dx.doi.org/10.1109/LPT.2016.2531790 |
| Access Level: | acceso abierto |
| Palabra clave: | Optical detectors Injection lasers Interferometry Vibrators Nanoscience Optical feedback Doppler frequency optical sensors nano displacement sensing injection locking LASER-DIODE SEMICONDUCTOR-LASERS Detectors Làsers Interferometria Vibració Nanociència Àrees temàtiques de la UPC::Ciències de la visió::Òptica física Àrees temàtiques de la UPC::Enginyeria electrònica::Optoelectrònica::Làser Àrees temàtiques de la UPC::Física::Acústica |
| Sumario: | We demonstrate a novel method that makes an efficient use of laser nonlinear dynamics when subject to optical self-injection for subwavelength displacement sensing purposes. The proposed methodology combines two different phenomena taking place inside the laser cavity: optical self-injection, which results in optical feedback interference, and laser continuous wave frequency modulation, giving rise to a wavelength sweeping effect in the laser's emission. We present a combination of these phenomena to measure vibration amplitudes below lambda/2 with the resolutions of a few nanometers, bandwidth dependent upon the distance of external target, amplitude, and frequency of current modulation. The basic theoretical details and a mathematical model are presented for the developed measurement principle. Experimental results with the system working as a vibrometer to measure a target vibration of amplitude lambda/5 (137.5 nm) with a mean peak-to-peak error of 2.4 nm just by pointing the laser diode onto the target and applying some signal processing are also demonstrated. |
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