Experimental determination of the frequency spectrum of the rose bengal picosecond fluorescence usin...

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" Experimental determination of the frequency spectrum of the rose bengal picosecond fluorescence using two beating ring dye lasers "
Z. H. Yamani

Document Type	:	Latin Dissertation
Language of Document	:	English
Record Number	:	1113504
Doc. No	:	TLpq230729708
Main Entry	:	Z. H. Yamani
Title & Author	:	Experimental determination of the frequency spectrum of the rose bengal picosecond fluorescence using two beating ring dye lasers\ Z. H. Yamani
College	:	King Fahd University of Petroleum and Minerals (Saudi Arabia)
Date	:	1993
student score	:	1993
Degree	:	M.S.
Page No	:	217
Abstract	:	In this thesis two ring dye lasers have been used to achieve amplitude modulated light of variable frequency. The amplitude modulated light was used to study the frequency response of an 800 ps risetime photomultiplier against different parameters. The photomultiplier was found not to have a frequency response dependence on intensity of incident light, photocathode illumination shape, laser wavelength (in the range 570-593 nm), and polarization of incident laser beam. The higher frequency components of the response were enhanced with increasing photomultiplier operating voltage. The amplitude modulated light was also used to perform demodulation spectroscopy on Rose Bengal. By measuring the demodulation in the fluorescence signal, the fluorescence lifetime of Rose Bengal in pure ethanol was found to be 740 4 ps. The lifetime was then determined in mixtures of water and ethanol. The fluorescence lifetime of Rose Bengal was found to monotonically decrease with increasing water concentration, and was found to be 80 22 ps in pure water. The decay rates of Rose Bengal fluorescence showed a nonlinear dependence on water concentration. This could be explained by a water cluster model.
Subject	:	Optics
	:	Pure sciences