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International Conference on Atomic Physics (ICAP)

Control of coherent light and its broad applications

Jun Ye, R. Jason Jones, Kevin W. Holman, Seth M. Foreman, David J. Jones, Steven T. Cundiff, J. L. Hall, Tara M. Fortier, Adela Marian

Published Apr 1, 2003• 0 citations
Publisher
DOI
10.1142/9789812705099_0035

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Abstract We propose a scheme for the generation of a white-light cavity with multiple broad frequency bands by using an incoherent pumped multi-level atomic system. Owing to the destructive quantum interference induced by the coherent coupling fields, multiple negative dispersion regions with a broadband characteristic can be achieved within the transparency windows, which result from resonant gain suppression. By simply adjusting the control fields, the negative material dispersion compensates the normal dispersion of cavity in the transparency regions, so we can obtain a white-light cavity with multiple wide frequency bands. Moreover, the cavity linewidth depends explicitly on the incoherent pumping rate and gas density. When the system interacts with more coherent coupling fields, we anticipate that more bands will be generated in the cavity transmission spectrum. The proposed scheme can find applications in many fields, such as a wide-band optical switch for multiple signals.
We suggest that supercontinuum can be used for absorption spectroscopy to observe the exciton levels of a semiconductor nano-structure. Exciton absorption spectrum of a GaAs/AlGaAs quantum well was observed using supercontinuum generated by a microstructrured fiber pumped by a femtosecond (fs) pulsed laser. Significantly narrower peaks were observed in the absorption spectrum from 11 K up to room temperature than photoluminescence (PL) spectrum peaks. Because supercontinuum is coherent light and can readily provide high enough intensity, this method can provide a coherent ultra-broad band light source to identify exciton levels in semiconductors, and be applicable to coherent nonlinear spectroscopy such as electromagnetically induced transparency (EIT), lasing without inversion (LWI) and coherent photon control in semiconductor quantum structures.