Coauthored saturation spectroscopy of sodium using a pulsed tunable dye laser, resolving hyperfine structure. A delayed probe detected velocity-selective optical pumping, while time-resolved measurements followed collisional redistribution in an argon buffer gas.[ref]
High-Resolution Saturation Spectroscopy of the Sodium D Lines with a Pulsed Tunable Dye Laser by Theodor W. Hänsch and others. Abstract: resolved splittings, delayed-probe hole burning and buffer-gas thermalization
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