Two photon absorption laser induced fluorescence measurements of neutral density in a helicon plasma


We have developed a new diagnostic based on two-photon absorption laser induced fluorescence (TALIF). We use a high intensity (5 MW/cm), narrow bandwidth (0.1 cm ) laser to probe the ground state of neutral hydrogen, deuterium and krypton with spatial resolution better than 0.2 cm, a time resolution of 10 ns, and a measurement cadence of 20 Hz. Here, we… (More)


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