SAMOP 2023 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 59: Poster IV

Q 59.77: Poster

Donnerstag, 9. März 2023, 16:30–19:00, Empore Lichthof

Influence of Temperature and Salinity on the Spectral Characteristics of Brillouin-Scattering in Water — •Daniel Koestel and Thomas Walther — TU Darmstadt, Institut für Angewandte Physik, 64289 Darmstadt, Germany

In our group we are developing a LiDAR-system for remote sensing the temperature and salinity in the ocean upper-mixed layer (~100m depth). We successfully demonstrated the functionality of this setup with a temperature resolution of up to 0.07°C and a depth resolution of up to 1m [1]. Both, spectral Brillouin shift and Brillouin linewidth (FWHM), depend on temperature and salinity. The spectral shift dependency of said parameters has already been studied extensively in the past [2,3]. This contribution aims to bring light to the less researched linewidth dependency on temperature and salinity [4]. For this purpose, we generated spontaneous Brillouin-scattering at 530nm in water in a laboratory environment at different temperatures and salinities. We will present our latest results and discuss further steps in the development. [1] A. Rudolf, Th. Walther, "Laboratory demonstration of a Brillouin lidar to remotely measure temperature profiles of the ocean", Opt. Eng. 53(5) (2014). [2] K. Schorstein, E. S. Fry, and Th. Walther, "Depth-resolved temperature measurements of water using the Brillouin lidar technique", Appl. Phys. B 97(4), 931-934 (2009). [3] E. S. Fry et al., "Remote sensing of the ocean: measurement of sound speed and temperature", Proc. SPIE (1998). [4] E. S. Fry et al., "Temperature dependence of the Brillouin linewidth in water", J. Modern Opt. 49(3-4), 411-418 (2002).