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 × 10⁻¹³ mol/L for λ = 488 nm. This is equivalent to an internal absorbance of 3.5 × 10⁻⁹. Similar measurements were performed with λ = 514.5 nm, but time- and space-periodic intensity fluctuations, particularly at lower light levels, reduced the sensitivity of the absorption detection.

© 1988 Optical Society of America

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