Abstract
We have investigated the relative contribution of Brillouin scattering to the filling in of both narrow and wide Fraunhofer lines in the ocean. The spectral behavior of the filling in was studied in two ways. First we studied Fraunhofer lines of variable width, such as the 455-nm Ba line with full-width at half-maximum (FWHM) = 0.02 nm, the 486-nm Hβ line (FWHM = 0.08 nm), and the 518-nm Mg line (FWHM = 0.11 nm). We then used the 455-nm Ba line as a narrow-line model to calculate the spectral dependence of the filling in. We found that Brillouin scattering can play a significant role in the filling in of narrow Fraunhofer lines in the ocean. We have also shown that, compared with the filling in caused by Raman scattering, the filling in caused by Brillouin scattering has less dependence on both the wavelength and ocean depth but is strongly dependent on the linewidth of the Fraunhofer line.
© 1994 Optical Society of America
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