Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 58: Poster: Quantum Optics and Photonics IV
Q 58.49: Poster
Donnerstag, 3. März 2016, 16:30–19:00, Empore Lichthof
Field test of a Brillouin-LIDAR for temperature profiles of the ocean — •Sonja Friman1, David Rupp1, Andreas Rudolf1, Charles Trees2, and Thomas Walther1 — 1TU Darmstadt, Institut für Angewandte Physik, 64289 Darmstadt — 2CMRE, 19136 La Spezia, Italy
In our group, a Brillouin-LIDAR for the measurement of temperature profiles of the ocean up to 100 m depths is being developed. It is meant to work as a flexible alternative to contact-based techniques. The temperature information is deduced from the Brillouin backscatter, which shows a temperature dependent spectral shift with respect to the incident laser frequency.
The LIDAR consists of a pulsed fiber amplifier as the beam source and an atomic edge filter as the detector. After frequency doubling, the ytterbium-doped fiber amplifier emits 10 ns pulses with a repetition rate of 1 kHz and a pulse energy of 0.5 mJ. The emission wavelength of 543.3 nm is set by the rubidium-based components of the setup: the absorption filter, which eliminates the elastic scattering from the signal, and the rubidium edge filter (ESFADOF).
The setup has successfully been tested under laboratory conditions, resulting in a temperature accuracy of up to 0.07∘C and a depth resolution of 1 m. Recently, a field test was conducted in the Mediterranean.
The setup, its functionality and the preliminary results from the field test are presented.