High speed determination of laser wavelength using Poincaré descriptors of speckle
Abstract
Laser speckle can provide a powerful tool that may be used for metrology, for example measurements of the incident laser wavelength with a resolution beyond that which may be achieved in a commercial device. However, to realise highest resolution requires advanced multi-variate analysis techniques, which limit the acquisition rate of such a wavemeter. Here we show an arithmetically simple method to measure wavelength changes with dynamic speckle, based on a Poincarè descriptor of the speckle pattern. We demonstrate the measurement of wavelength changes at femtometer-level with a measurement time reduced by two orders of magnitude compared to the previous state-of-the-art, which offers promise for applications such as speckle-based laser wavelength stabilisation.
- Publication:
-
Optics Communications
- Pub Date:
- March 2020
- DOI:
- 10.1016/j.optcom.2019.124906
- arXiv:
- arXiv:1909.00665
- Bibcode:
- 2020OptCo.45924906O
- Keywords:
-
- Speckle;
- Wavelength measurement;
- Poincaré descriptors;
- Physics - Optics;
- Physics - Instrumentation and Detectors
- E-Print:
- 6 pages, 3 figures