The dynamic speckle-based wavemeter

Steen G. Hanson; Michael Linde Jakobsen; Maumita Chakrabarti

doi:10.1117/12.2319873

7 September 2018 The dynamic speckle-based wavemeter

Steen G. Hanson, Michael Linde Jakobsen, Maumita Chakrabarti

Proceedings Volume 10834, Speckle 2018: VII International Conference on Speckle Metrology; 108342D (2018) https://doi.org/10.1117/12.2319873
Event: SPECKLE 2018: VII International Conference on Speckle Metrology, 2018, Janów Podlaski, Poland

Abstract

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.

Citation Download Citation

Steen G. Hanson, Michael Linde Jakobsen, and Maumita Chakrabarti "The dynamic speckle-based wavemeter", Proc. SPIE 10834, Speckle 2018: VII International Conference on Speckle Metrology, 108342D (7 September 2018); https://doi.org/10.1117/12.2319873

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