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Quantum measurement in quantum optics - new light on the nature of darkness

Harry J. Kimble

Published Jan 1, 1993• 0 citations
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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Apr 9, 2001•0 citations
Is the nature of light observed only indirectly after its interaction with matter? We currently lack an experimental technique which would isolate the nature of light without the use of matter i.e., a detector. We will present additional experiments which, although again indirect, may reveal new understandings (but mostly more questions) about the nature of light. This talk will not report research results, but rather be an invitation for others to conduct similar such measurements as will be proposed. Past measurements have measured no absorption of radiation in the dark fringe (concluding no light is present due to canceling of the fields). Does the radiation in a dark fringe cause stimulated emission? What are the photon statistics in a dark fringe?
Dark States for Rubidium 85 have been obtained in glass cells containing saturated vapors of natural Rubidium at room temperature. The two radiation, which are required to induce the dark states, have been generated by modulating the light emission of a laser diode, tuned at the S-P optical transition. A measurement of the energy difference between the hyperfine states F equals 2 and F equals 3 of 5S1/2 is performed by an optical way. By using simultaneously two laser diodes, one tuned at the D1 transition and the other at the D2, we have generated two different Dark States. Interference between the two dark states prepared on the same place has been studied by changing the phase of the D1 and D2 excitations. A new way to modulate laser beam intensity is shown.