Experimental demonstration of negative dispersion without absorption

Year: 2000

Authors: Wicht A., Muller M., Rinkleff RH., Rocco A., Danzmann K.

Autors Affiliation: ibniz Univ Hannover, Spekt Abt, Inst Atom & Molekulphys, D-30167 Hannover, Germany; Max Planck Inst Quantum Opt, Aussenstelle Hannover, D-30167 Hannover, Germany.

Abstract: We present the results of an experiment proving in principle that negative (anomalous) dispersive transparent media can be realized. The Ca-transition 4s(2) S-1(0) –> 4s4p(1)P(1) at lambda = 423 nm was chosen to investigate the absorption and index of refraction spectra of a two-level system strongly driven at resonance. For the simultaneous high precision measurement of loss and phase shift imposed on a probe field during the interaction with a chopped Ca-atomic beam we used a novel spectrometer which is based on a phase modulated Mach-Zehnder interferometer. So far, a dispersion of partial derivative(omega)n(o), = -(3.1 +/- 1.0) X 10(-10)/MHz accompanied by residual absorption of alpha(0) = (0.125 +/- 0.040)%/cm has been achieved. These values are compared to the requirements which have to be achieved for a certain application of negative dispersion without absorption, that is for a broadband high build-up cavity (white-light cavity). (C) 2000 Elsevier Science B.V. All rights reserved.

Journal/Review: OPTICS COMMUNICATIONS

Volume: 179 (1-6)      Pages from: 107  to: 115

More Information: This work was supported by the Sonderforschungsbereich SFB 407 of the Deutsche Forschungsgemeindschaft DFG.
KeyWords: atomic coherence effects; negative (anomalous) dispersion; phase modulated Mach-Zehnder interferometer
DOI: 10.1016/S0030-4018(99)00528-3

Citations: 32
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