Conference paper
The dynamic speckle-based wavemeter
Based on a previously devised speckle-based set-up for probing minute wavelength changes for a coherent field [1], [2] we will here present the first experiments where these changes are resolved on a millisecond time scale. The setup is based on probing the lateral shift of a speckle pattern arising from a slanted rough object, the speckle displacement being linearly proportional to the wavenumber change.
Thus, by shearing the speckle pattern across a grating-like structure [3],[4] and [5], a frequency proportional to the frequency of the wavelength change can be derived as will the irradiance. Thus, a cordial display of the complex field amplitude may be obtained with a high temporal resolution and a reasonable spectral resolution.
The spatial filter is here preliminarily implemented by recording the speckle pattern with a CMOS array with subsequent digital image processing mimicking the use of a spatial filter.
Language: | English |
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Publisher: | SPIE - International Society for Optical Engineering |
Year: | 2018 |
Pages: | 108342D-108342D-6 |
Proceedings: | 7th International Conference on Speckle Metrology |
Series: | Proceedings of Spie - the International Society for Optical Engineering |
ISBN: | 1510622977 , 1510622985 , 9781510622975 and 9781510622982 |
ISSN: | 1996756x and 0277786x |
Types: | Conference paper |
DOI: | 10.1117/12.2319873 |
ORCIDs: | Hanson, Steen Grüner and Jakobsen, Michael Linde |