A Brillouin gain spectrometer and its evaluation by the study of some liquids

Fan, Chunxia (1994) A Brillouin gain spectrometer and its evaluation by the study of some liquids. Masters thesis, Memorial University of Newfoundland.

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    Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.
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Abstract

The construction and testing of a Brillouin gain spectrometer is discussed. The spectrometer employs a high power (150 mW) tunable dye laser and a low power (1.7 mW) stabilized HeNe laser in a pump-probe arrangement Because of the small signal gain (1 x 10⁻⁵), several noise reduction schemes were used to enhance the signal to noise ratio. The spectrometer was evaluated by studying the strongly scattering liquid CS₂ and the weakly scattering liquid CC1₄. Brillouin shifts and linewidths were accurately determined for both liquids. The high resolution of this instrument permitted measurement of the small asymmetry in the measured lineshapes. In CC1₄ we were able to observe the so-called Mountain mode and to confirm that CC1₄ can be modeled as a liquid exhibiting a single relaxation time.

Item Type: Thesis (Masters)
URI: http://research.library.mun.ca/id/eprint/1334
Item ID: 1334
Additional Information: Bibliography: leaves 65-68
Department(s): Science, Faculty of > Physics and Physical Oceanography
Date: 1994
Date Type: Submission
Library of Congress Subject Heading: Brillouin scattering; Spectrometer--Evaluation; Liquids--Spectra

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