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Thermally induced laser pulsing to measure weak optical absorptions

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Abstract

Intracavity thermal lensing has been used to convert a cw dye laser to pulsed operation. The pulse width is a measure of the absorptivity of the solution in the cell. Experimental data are presented to show how this technique can be used to measure the absorptivity of a pure solvent and the concentration of a solute. The absorptivities (base e) of water, CH3OH, CH3COCH3, and CCl4 were determined to be, respectively, (1.24 ± 0.17) × 10−3, (1.01 ± 0.07) × 10−3, (1.74 ± 0.09) × 10−4, and (3.95 ± 3.40) × 10−6 cm−1. For CCl4 in a 10-cm sample cell, the minimum detectable absorptivity is ~4 × 10−6 cm−1.

© 1981 Optical Society of America

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