Measurement of the Group Velocity of Light in Sea Water at the ANTARES Site
S. Adri\'an-Mart\'inez, I. Al Samarai, A. Albert, M. Andr\'e, M., Anghinolfi, G. Anton, S. Anvar, M. Ardid, A. C. Assis Jesus, T. Astraatmadja,, J-J. Aubert, B. Baret, S. Basa, V. Bertin, S. Biagi, A. Bigi, C. Bigongiari,, C. Bogazzi, M. Bou-Cabo, B. Bouhou, M. C. Bouwhuis
TL;DR
This study measures the group velocity of light at various wavelengths in deep-sea water and confirms that a parametrization based on local salinity, pressure, and temperature accurately predicts the refractive index.
Contribution
It provides the first detailed measurements of light group velocity in deep-sea water at multiple wavelengths and validates a parametrization model for the refractive index.
Findings
Measured group velocity at 8 wavelengths between 385 nm and 532 nm.
Validated the refractive index parametrization against measurements.
Confirmed the model's accuracy for ANTARES site conditions.
Abstract
The group velocity of light has been measured at eight different wavelengths between 385 nm and 532 nm in the Mediterranean Sea at a depth of about 2.2 km with the ANTARES optical beacon systems. A parametrisation of the dependence of the refractive index on wavelength based on the salinity, pressure and temperature of the sea water at the ANTARES site is in good agreement with these measurements.
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