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Laser induced fluorescence spectra from Cs measured through an optical nanofiber for the closed-cycle transition, 6S F = 4 ↔ 6P F = 5. Traces A and B correspond to without and with the effect of violet laser irradiation, respectively. The violet irradiation was used to remove Cs that had adhered to the surface of the fiber. Reprinted with permission from [58]. Copyright 2008 Institute of Physics.
