Abstract

Two intracavity laser absorption techniques for ultralow concentration detection of chemicals in solution are compared. The first consists of a laser diode in a grating extended cavity, which produces a linear calibration curve for parts in 109 (ppb) concentrations corresponding to 17  nM. By replacing the grating with a highly reflective mirror, parts in 1012 (ppt) concentration detection is achieved, which corresponds to 340   pM. We report, to our knowledge for the first time, ppt detection of analyte concentration in liquid solution demonstrating good agreement between theory and experiment.

© 2007 Optical Society of America

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