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Conference on Lasers and Electro-Optics

Phase-matching between optical and sound waves in forward direction via ultra-slow light

Yuri V. Rostovtsev, Vladimir A. Sautenkov, Aihua Zhang, Eugeniy E. Mikhailov, George R. Welch, Marlan O. Scully

Published Jan 1, 2004• 0 citations
Publisher

Abstract

We experimentally demonstrated phase-matching between optical waves propagating in the same direction and sound wave in the cell of Rb vapor. Phase-matching occurs when group velocity of light is equal to the sound speed.
DOI
10.1364/iqec.2004.ima6

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We have experimentally demonstrated anomalous stimulated scattering of sound waves with optical waves of the same direction in a cell of Rb vapor. The optical wave is propagating under the conditions for ultra-slow group velocity. The phase-matching condition for the interaction of the waves is achieved when the group velocity of the probe field to approximately the speed of the sound wave.

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Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text G. R. Welch, A. Zhang, V. A. Sautenkov, and Y. V. Rostovtsev, "Enhanced Coupling between Optical and Sound Waves via Ultra-Slow Light," in Frontiers in Optics, OSA Technical Digest Series (Optica Publishing Group, 2005), paper LWH3. Export Citation BibTex Endnote (RIS) HTML Plain Text Citation alert Save article

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Optical propagation with slow and negative group velocity in Rb vapor

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Summary form only given. The propagation of light in a dispersive medium is characterized by the group velocity /spl nu//sub g/=c(n+/spl nu//sup dn//d/spl nu/)/sup .1/ where n is the refractive index and /spl nu/ the optical frequency. Depending on the sign and magnitude of /sup dn//d/spl nu/ in the medium, the group velocity can be positive, infinite or negative. The group velocity corresponds to the speed of the propagation of the maximum of an optical pulse travelling into the medium. This remains true whether the dispersion in the medium is normal (/sup dn//d/spl nu/>0) or anomalous (/sup dn//d/spl nu/<0). It has been demonstrated that coherently prepared atomic systems can exhibit steep dispersion leading to small absolute values of the group velocity (slow light). In recent work, we have demonstrated that narrow resonances arising from the coherent interaction of two optical fields with a closed atomic transition between two degenerate levels may correspond to a steep anomalous dispersion and thus to slow and negative group velocity. We report on the experimental study of the propagation of an amplitude modulated wave in a medium presenting negative group velocity.

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References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253 The propagation of light in dispersive media can be described by five different kinds of wave velocities [1-3]: • Phase velocity, which is the speed at which the zero crossings of the carrier wave move • Group velocity, at which the peak of a wave packet moves • Energy velocity, at which the energy is transported by the wave • Signal velocity, at which the half-maximum wave amplitude moves • Front velocity, at which the first appearance of a discontinuity moves Generally, all five velocities can differ from each other, although in a linear passive dispersive media, they coincide and are, usually, less than the light velocity in vacuum. Recently, experimental demonstrations [4-6] in variousmedia show that the group velocity of light canbe reducedby10-100million compared with its vacuum phase velocity. The physics is based on very steep frequency dispersion in the vicinity of narrow resonance of electromagnetically induced transparency (EIT) [7-11].

CRC Press eBooks•Oct 8, 2018•0 citations

A study of coherent nonlinear processes in dense media with continuous and pulsed laser fields

Aihua Zhang

Coherent nonlinear effects such as Electromagnetically Induced Transparency\n(EIT), Coherent Population Trapping (CPT), and Slow light are studied in thermal\nRb vapor by both continuous and pulsed laser fields. This work primarily includes\nthree parts: (I) mode-locked rubidium laser and its applications (II) enhanced coupling\nbetween optical and sound waves in the forward direction via ultra-slow light\n(III) optical steering via ultra-slow light in rubidium vapor.\nIn part(I), I describe the construction and study of a mode-locked rubidium laser\noperating at the Rb D1 line using an active mode-locking technique inside the laser\ncavity. The mode-locked laser field is used to observe coherent effects in a dense\nrubidium gas.\nIn part(II), I experimentally demonstrate enhanced acoustic-optic coupling that\noccurs when the velocity of sound is close to the group velocity of light. Dragging of\nthe light by effective motion of the gas in a Rb cell is the origin of enhanced coupling.\nGood agreement between theory and experiment is found.\nIn part(III), I experimentally demonstrate optical beam deflection in coherently\ndriven rubidium vapor due to the steep refraction index profile in the region of EIT.

•Jul 14, 2010•0 citations
The talk consists of two parts. In the first, we have demonstrated enhancement of nonlinear signals and suggested a new approach that extends Raman spectroscopy to media which has a high level of scattering. The stimulated Raman scattering has an advantage of relaxing phase-matching condition which is difficult or even impossible to meet under condition of strong scattering. The second topic is related to enhanced optico-mechanical coupling that occurs when the group velocity of light is ultra-slow. We show theoretically that, due to dragging of the light by the mechanical motion of the medium, it is possible to control phase-matching condition.
Summary form only given. The propagation of light in a dispersive medium is characterized by the group velocity /spl nu//sub g/=c(n+/spl nu//sup dn//d/spl nu/)/sup .1/ where n is the refractive index and /spl nu/ the optical frequency. Depending on the sign and magnitude of /sup dn//d/spl nu/ in the medium, the group velocity can be positive, infinite or negative. The group velocity corresponds to the speed of the propagation of the maximum of an optical pulse travelling into the medium. This remains true whether the dispersion in the medium is normal (/sup dn//d/spl nu/>0) or anomalous (/sup dn//d/spl nu/<0). It has been demonstrated that coherently prepared atomic systems can exhibit steep dispersion leading to small absolute values of the group velocity (slow light). In recent work, we have demonstrated that narrow resonances arising from the coherent interaction of two optical fields with a closed atomic transition between two degenerate levels may correspond to a steep anomalous dispersion and thus to slow and negative group velocity. We report on the experimental study of the propagation of an amplitude modulated wave in a medium presenting negative group velocity.
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253 The propagation of light in dispersive media can be described by five different kinds of wave velocities [1-3]: • Phase velocity, which is the speed at which the zero crossings of the carrier wave move • Group velocity, at which the peak of a wave packet moves • Energy velocity, at which the energy is transported by the wave • Signal velocity, at which the half-maximum wave amplitude moves • Front velocity, at which the first appearance of a discontinuity moves Generally, all five velocities can differ from each other, although in a linear passive dispersive media, they coincide and are, usually, less than the light velocity in vacuum. Recently, experimental demonstrations [4-6] in variousmedia show that the group velocity of light canbe reducedby10-100million compared with its vacuum phase velocity. The physics is based on very steep frequency dispersion in the vicinity of narrow resonance of electromagnetically induced transparency (EIT) [7-11].
Coherent nonlinear effects such as Electromagnetically Induced Transparency\n(EIT), Coherent Population Trapping (CPT), and Slow light are studied in thermal\nRb vapor by both continuous and pulsed laser fields. This work primarily includes\nthree parts: (I) mode-locked rubidium laser and its applications (II) enhanced coupling\nbetween optical and sound waves in the forward direction via ultra-slow light\n(III) optical steering via ultra-slow light in rubidium vapor.\nIn part(I), I describe the construction and study of a mode-locked rubidium laser\noperating at the Rb D1 line using an active mode-locking technique inside the laser\ncavity. The mode-locked laser field is used to observe coherent effects in a dense\nrubidium gas.\nIn part(II), I experimentally demonstrate enhanced acoustic-optic coupling that\noccurs when the velocity of sound is close to the group velocity of light. Dragging of\nthe light by effective motion of the gas in a Rb cell is the origin of enhanced coupling.\nGood agreement between theory and experiment is found.\nIn part(III), I experimentally demonstrate optical beam deflection in coherently\ndriven rubidium vapor due to the steep refraction index profile in the region of EIT.