Abstract

We observe an inverted crossover resonance in π-driven four-level systems, where FF=0,+1. The signal is observed through saturated absorption spectroscopy of the (6s2)S01(6s6p) P13 transition in Yb171, where the nuclear spin I=1/2. The enhanced absorption signal is used to generate a dispersive curve for 556 nm laser frequency stabilization and the stabilized light cools Yb171 atoms in a two-stage magneto-optical trap, achieving temperatures of 20 μK. The Doppler-free spectroscopy scheme is further used to measure isotopic frequency shifts and hyperfine separations for the inter-combination line in ytterbium.

© 2016 Optical Society of America

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