title: External photoacoustic detection of a trace vapor inside a multimode laser.
abstract: We combine highly sensitive intracavity absorption spectroscopy in a multimode laser with external photoacoustic detection, providing high detectivity. Photoacoustic measurements of the intracavity iodine concentration in a Rhodamine 6G laser are compared with simultaneous spectral recordings. They demonstrate slightly improved overall sensitivity and a greatly enhanced dynamic range of 5 orders of magnitude that may be shifted along the absolute scale of absorber density.
authors.affiliation: Institut für Laser-Physik, Universität Hamburg, Jungiusstrasse 9, D-20355 Hamburg, Germany.
authors.forename: T J
authors.initials: TJ
authors.lastname: Latz
authors.forename: G
authors.initials: G
authors.lastname: Weirauch
authors.forename: V M
authors.initials: VM
authors.lastname: Baev
authors.forename: P E
authors.initials: PE
authors.lastname: Toschek