Erlangen 2022 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 42: Laser and Laser Applications

Q 42.7: Poster

Wednesday, March 16, 2022, 16:30–18:30, P

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

In our group we are developing a LIDAR system for remote measurement of temperature and salinity in the ocean upper-mixed layer (∼ 100 m 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 1 m [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 530 nm in water in a laboratory environment at different temperatures and salinity. The scattering signal is then analyzed by a scanning FPI (Fabry-Pérot interferometer). We will present our latest results and discuss further steps in the development. [1] Th. Walther et al., Opt. Eng. 53(5) (2014). [2] Th. Walther et al., Appl. Phys. B 97(4), (2009). [3] E. S. Fry et al., Appl. Opt. (1997). [4] E. S. Fry et al., J. Modern Opt. (2002).