Abstract
We observe an inverted crossover resonance in -driven four-level systems, where
. The signal is observed through
saturated absorption spectroscopy of the
transition in
, where the nuclear spin
. The enhanced absorption signal is
used to generate a dispersive curve for 556 nm laser frequency
stabilization and the stabilized light cools 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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