High-sensitivity spectroscopy with the aid of dye lasers

It was established that organic dye lasers could be used in very-high-sensitivity laser spectroscopy based on the selection of losses in the resonator. A smooth emission spectrum was obtained for rhodamine G and the abosrption spectrum of I₂ with an absorption coefficient of ~10^–3 cm^–1 was recorded in the 16450–17950-cm^–1 range.