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

Author: Marcano O. A.   Ojeda J.   Melikechi N.  

Publisher: Society for Applied Spectroscopy

ISSN: 0003-7028

Source: Applied Spectroscopy, Vol.60, Iss.5, 2006-05, pp. : 560-563

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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.

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