title: Intracavity absorption measurements from liquid samples in an Ar(+)-ion laser.
abstract: We present experimental intracavity absorption measurements carried out in a commercial Ar(+)-ion laser with a modified resonator. The samples were aqueous solutions of Rhodamine 6G. The smallest detectable concentration was 1 x 10(-13) mol/L for lambda = 488 nm. This is equivalent to an internal absorbance of 3.5 x 10(-9). Similar measurements were performed with lambda = 514.5 nm, but time- and space-periodic intensity fluctuations, particularly at lower light levels, reduced the sensitivity of the absorption detection.
authors.forename: E
authors.initials: E
authors.lastname: Kleist
authors.forename: H
authors.initials: H
authors.lastname: Bettermann