Lamb-Dip Laser-Induced Fluorescence Spectroscopy in a Supersonic Plasma Jet for Isotope Identification

Abstract

Isotope analysis is challenging because spectral resolution is reduced in high-temperature plasma. In this study, a method involving Lamb-dip laser-induced fluorescence spectroscopy combined with a supersonic plasma jet was developed for the detection of strontium (Sr) isotopes. This newly developed system, with a counter-propagating laser configuration to provide an incident laser beam intensity of 61.8 mW mm⁻², selectively detected the Lamb-dip of ⁸⁸Sr using a spectral frequency width of 35 MHz.