Investigations for real-time Raman measurements in the deep-ocean by applying a 1.5 W BA DFB diode laser and long optical fibers
H.-D. Kronfeldta, M. Maiwalda,c, H. Ahmada, H. Schmidta, K. Wohlfahrtb, B. Sumpfc, A. Klehrc, G. Erbertc
Published in:
Proc. SPIE, vol. 7673, no. 76730B (2010).
Abstract:
Raman spectroscopy is a powerful tool to obtain "fingerprint" spectra from substances in numerous applications. In-situ and/or real time measurements are interesting for the detection of minerals, organic compounds, gas hydrates or methane in the deep-ocean. In this work we present Raman measurements of selected minerals. A DFB diode laser at 785 nm was used as excitation light source with an output power up to 1.5 W. An excitation fiber of 1000 m length was used to demonstrate the suitability of Raman spectroscopy for deep-sea applications.
a Institute of Optics and Atomic Physics, Technical University of Berlin, Hardenbergstr. 36, 10623 Berlin, Germany
b Centre for Marine Environmental Sciences, University of Bremen, Leobener Straße, 28359 Bremen, Germany
c Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Optoelectronics Department, Gustav-Kirchhoff-Str. 4, 12489 Berlin, Germany
Keywords:
Deep-ocean, in-situ Raman spectroscopy, optical fiber, DFB laser diode, minerals.
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