Absorption Spectra of Dye Solutions Measured Using a White Light Thermal Lens Spectrophotometer

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Abstract:

We describe a two-beam thermal lens spectrophotometer that uses a xenon lamp as the excitation source and a low power diode pumped Nd-YAG laser as the probe light. The white light from the xenon source is filtered using a variable interference filter producing a partial monochromatic light within the spectral range 400–700 nm and with a spectral resolution of 10 nm. We measure the thermal lens spectrum of a nonfluorescent dye (Malachite Green) and show that this spectrum reproduces its absorbance spectra measured by the usual transmission method. A comparison of the thermal lens and the absorbance spectra of a fluorescent dye (Rhodamine B) reveals substantial differences. These differences can yield important applications of the device for the characterization of fluorescent materials.

Keywords: ABSORPTION SPECTROSCOPY; THERMAL LENS SPECTROSCOPY; WHITE LIGHT EXCITATION SOURCE

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370206777412077

Affiliations: 1: Applied Optics Center, Delaware State University, Dover, Delaware 19901 2: Centro de Física, Instituto Venezolano de Investigaciones Científicas, Caracas 1020A Apartado 21827, Venezuela

Publication date: May 1, 2006

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