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The European Physical Journal A

On optical dispersion in transparent molecular systems

Ulrich Hauser, Volker Oestreich, Heinz Dieter Rohrweck

Published Mar 1, 1978• 46 citations
Publisher
DOI
10.1007/bf01433868

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Electromagnetically induced transparency in a three-level Lambda-type molecular system with nonzero permanent dipole moments is investigated. It is shown that in the (2+2)-transition processes, when the sign of d(21), the difference in permanent dipole moments of the probe transition, is positive, perfect electromagnetically induced transparency with steep normal dispersion could be obtained under specific conditions. In contrast, when the sign of d(21) is negative, surprisingly gain without inversion with steep anomalous dispersion could be attained.
Propagation of a fibre mode inside a thin optical fibre surrounded by a molecular solid of ortho-H2 doped in a matrix of para-H2 crystal is considered. The evanescent fields of the fibre modes interact with the molecular solid which behaves as an electromagnetically induced transparency medium. It is shown that the dispersion behaviour and hence the group velocity of a weak (probe) field fibre mode can be manipulated by coherently controlling the dispersion of the surrounding medium via another strong (control) evanescent field of the thin fibre, using a low density crystal surrounding the fibre. For a set of experimental parameters of the medium, fibre and fields, the group velocity of the fibre mode could be drastically reduced to about a few hundreds of ms−1.
Systems that exhibit positive and negative dispersion are of interest for numerous applications especially when accompanied by transparency. In this work, we study the variation of the sign of the dispersion in the case of a four-level ‘N-Scheme’ system. The different dynamics of the sign and value of dispersion and transparency are first explored in light of three resonances that we have previously introduced, then studied as a function of the varying strengths of the fields. As an application we consider in this work both passive and active optical gyroscopes.