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Laser spectroscopy: Comb-based measurements
Quantum interference can play an important role in laser spectroscopy of unresolved transitions. This has been observed at NIST in studying comb-based measurements of the D lines in the spectra of stable lithium isotopes. Improved resolution and accuracy of this comb-based measurement has helped to resolve the long-standing discrepancies that hampered stringent tests of few-electron atomic theory.
(a) Can. J. Phys. 89:59-62 (2011): DOI:10.1139/P10-096
(b) DOI:10.1103/PhysRevLett.107.023001
(c) http://meetings.aps.org/Meeting/DAMPO11/Event/147350