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Quantum Electronics and Laser Science Conference

An ultra-dispersive optically controlled atomic prism

Hebin Li, Vladimir A. Sautenkov, Yuri V. Rostovtsev, Marlan O. Scully

Published May 1, 2007• 0 citations
Publisher

Abstract

We have experimentally demonstrated an ultra-dispersive atomic prism with the highest spectral angular dispersion ever shown (six orders of magnitude higher than glass prism). Its dispersion is optically controlled by a coherent driving field.
DOI
10.1109/qels.2007.4431586

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We have theoretically predicted and experimentally demonstrated an ultra-dispersive atomic prism made of coherently driven Rb atomic vapor. The prism posses spectral angular dispersion that six orders of magnetude higher than the prism made from optical glass; it is the highest spectral angular dispersion that has been ever shown (such angular dispersion allows one to resolve spatially light separated by a few kHz). The prism is working near the resonant frequency of atomic vapor, and its dispersion is optically controlled by coherent driving field.
We have experimentally demonstrated an ultra-dispersive optical prism made from a coherently driven Rb atomic vapor. The prism possesses spectral angular dispersion that is 6 orders of magnitude higher than that of a prism made of optical glass; such angular dispersion allows one to spatially resolve light beams with different frequencies separated by a few kilohertz. The prism operates near the resonant frequency of atomic vapor and its dispersion is optically controlled by a coherent driving field.
The Brewster prism-pair is a major tool for dispersion control that produces tuned negative dispersion even when the prisms material has positive dispersion. We present a complementary technique for obtaining overall positive dispersion even when the material dispersion is negative, which is most useful for applications in the infrared, where the majority of the optical materials have negative dispersion. By adding a telescope between the prisms that images the first prism beyond the location of the second one, an effectively negative separation between the prisms can be obtained. This ability to flip the sign of the angular dispersion between the prisms provides a powerful new knob to the prism-pair system and allows higher degree of dispersion compensation. We demonstrate a prism-pair configuration, where both the 2nd and 4th order dispersion are compensated in the 1400-2400nm range, designed for a quantum optics experiment with ultra-broadband bi-photons. c 2014 Optical Society of America OCIS codes: 140.7090, 230.5480 Since the introduction of the Brewster prism-pair as a mechanism for dispersion control [1], it became a major tool for tuned dispersion compensation in ultrafast optical systems. Specifically, a prism-pair is commonly used to compensate for second-order dispersion (group delay dispersion - GDD). The angular dispersion that is created by the separation between the prisms tips always introduces negative GDD, even when the prisms material produces positive GDD. Thus, any negative dispersion can be achieved by the appropriate separation between the prisms; and tuned dispersion can be achieved by controlling the amount of prism material in the beam.