Optical: systems and elements – Optical frequency converter
Patent
1998-10-30
2000-08-01
Lee, John D.
Optical: systems and elements
Optical frequency converter
359330, G02F 139
Patent
active
060975326
ABSTRACT:
A method for producing electromagnetically induced transparency (EIT) in atoms with hyperfine structure. EIT is the phenomenon in which a material (e.g. lead vapor) becomes transparent to a first electromagnetic frequency (a probe beam) when exposed to a second electromagnetic frequency (a coupling beam). In the present invention, the atom has hyperfine split energy levels. In the method of the present invention, the coupling and probe beams are tuned to transitions between the centers of gravity (COGs) of the hyperfine split levels. This allows high transparencies to be achieved in high opacity materials. Also, the present method can produce EIT in isotopically mixed materials. This is because the COGs of hyperfine split levels (in nuclear spin.notident.0 atoms) are generally coincident with nonhyperfine split levels (in nuclear spin=0 atoms). The method of the present invention is directly applicable to nonlinear sum and difference frequency generation.
REFERENCES:
patent: 5771117 (1998-06-01), Harris et al.
patent: 5970039 (1999-10-01), Ichimura et al.
H. Xia et al, "Electromagnetically Induced Transparency With Spectator Momenta", 1998 Quantum Electronics Conference (IQEC98) Technical Digest, Paper QWG1, May 1998, pp. 129-130.
Harris Stephen E.
Merriam Andrew J.
Sharpe Scott J.
Xia Hui
Yin Guang-Yu
Lee John D.
The Board of Trustees of the Leland Stanford Junior University
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