Patent ID: 6172793
Filing Date: 2001-01-09
Classification: B82Y,G02F

Abstract:
Apparatus for controlling an optical transition comprising:an optically responsive medium;a source to provide a first pulse of optical radiation of a predefined wavelength characteristic to the medium to produce a resonant excitation from a first energy level to a second energy level, the resonant transition between the first and second energy levels having a relatively narrow linewidth;a source to provide a second pulse of optical radiation to the medium, the relative timing of the first and second pulses and the relative phase of the radiation thereof being selected so that the second pulse de-excites the resonant excitation produced by the first,another source to provide optical radiation to produce a resonant excitation from a third energy level to the second resonant level, the resonant transition between the second and third energy levels having a relatively wide linewidth;wherein resonant transitions between the first and second energy levels control resonant transitions between the second and third transitions.