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 (ppb) concentrations corresponding to . By replacing the grating with a highly reflective mirror, parts in (ppt) concentration detection is achieved, which corresponds to . 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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