Electromagnetically induced transparency and dark fluorescence in a cascade three-level diatomic lithium system

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Jianbing Qi¹ and A. Marjatta Lyyra²
¹Department of Physics and Astronomy, Penn State Berks, Tulpehocken Road, P.O. Box 7009, Reading, Pennsylvania 19610, USA
²Physics Department, Temple University, Philadelphia, Pennsylvania 19112, USA

Received 20 September 2005; published 19 April 2006

Followingour previous brief report [Phys. Rev. Lett. 88, 173003 (2002)],we report here a detailed study of electromagnetically induced transparency(EIT) and dark fluorescence in a cascade three-level diatomic lithiumsystem using optical-optical double resonance (OODR) spectroscopy for both resonanceand off resonance coupling. When a strong coupling laser couplesthe intermediate state A ¹ Sigma u+ (v=13,J=14) to the upper state G ¹_g(v=11,J=14) of⁷Li₂, the fluorescence from both A ¹ Sigma and G ¹_g states wasdrastically reduced as the weak probe laser was tuned throughthe resonance transition between the ground state X ¹ Sigma g+ (v=4,J=15) and theexcited state A ¹ Sigma u+ (v=13,J=14). The strong coupling laser makes an opticallythick medium transparent for the probe transition. In addition, thefact that fluorescence from the upper state G ¹_g(v=11,J=14) was alsodark when both lasers were tuned at resonance implies thatthe molecules were trapped in the ground state. We useddensity matrix methods to simulate the response of an openmolecular three-level system to the action of a strong couplingfield and a weak probe field. The analytical solutions wereobtained under the steady-state condition. We have incorporated the magneticsublevel (M) degeneracy of the rotational levels in the lineshape analysis and report |M| dependent line shape splitting. Ourtheoretical calculations are in excellent agreement with the observed fluorescencespectra. We show that the coherence is remarkably preserved evenwhen the coupling field was detuned far from the resonance.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.73.043810
DOI:	10.1103/PhysRevA.73.043810
PACS:	42.50.Gy; 42.50.Hz; 33.40.+f 42.50.Gy Effects of atomic coherence on propagation, absorption, and amplification of light; electromagnetically induced transparency and absorption 42.50.Hz Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift 33.40.+f Multiple resonances of molecules including double and higher-order resonance processes, such as double nuclear magnetic resonance, electron double resonance, and microwave optical double resonance YEAR: 2006
KEYWORDS:	lithium, self-induced transparency, optical double resonance, fluorescence, photoexcitation, radiation pressure, rotational states, spectral line breadth, ground states

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