Coherent 455nm beam production in cesium vapor
Justin T. Schultz,Sven Abend,D. Döring,John Debs,P. A. Altin,James D. White,Nicholas Robins,John Close +7 more
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In this article, two infrared pump lasers induce strong double-excitation in a heated cesium vapor cell, allowing the atoms to undergo a double cascade and produce a coherent, collimated, blue beam co-propagating with the two IR pump lasers.Abstract:
We observe coherent, continuous wave, 455nm blue beam production via frequency up-conversion in cesium vapor. Two infrared lasers induce strong double-excitation in a heated cesium vapor cell, allowing the atoms to undergo a double cascade and produce a coherent, collimated, blue beam co-propagating with the two infrared pump lasers.read more
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Enhanced frequency up-conversion in Rb vapor
TL;DR: A full exploration of the coherent light generation and fluorescence as a function of both pump frequencies reveals that coherent blue light is generated close to (85)Rb two-photon resonances, as predicted by theory, but at high vapor pressure is suppressed in spectral regions that do not support phase matching or exhibit single-Photon Kerr refraction.
Journal ArticleDOI
Collimated blue and infrared beams generated by two-photon excitation in Rb vapor
TL;DR: Utilizing two-photon excitation in hot Rb vapor, the generation of collimated optical fields at 420 and 1324 nm is demonstrated, resulting in a coherent blue beam of 9.1 mW power, almost an order of magnitude larger than previously achieved.
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Blue and infrared stimulated emission from alkali vapors pumped through two-photon absorption
TL;DR: In this article, the 5 2D3/2 and 7 2S1/2 states of rubidium were populated at low pressure by two photon excitation using a pulsed dye laser.
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Directional infrared emission resulting from cascade population inversion and four-wave mixing in Rb vapor.
TL;DR: Directional infrared emission at 1.37 and 5.23 μm is generated in Rb vapors that are stepwise excited by low-power cw resonant light and wave mixing consists of forward- and backward-directed components with distinctive spectral and spatial properties.
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Distinguishing nonlinear processes in atomic media via orbital angular momentum transfer.
TL;DR: A technique based on the transfer of topological charge from applied laser radiation to directional and coherent optical fields generated in ladder-type excited atomic media to identify the major processes responsible for their appearance is suggested.
References
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Electromagnetically induced transparency : Optics in coherent media
TL;DR: In this paper, the authors consider the atomic dynamics and the optical response of the medium to a continuous-wave laser and show how coherently prepared media can be used to improve frequency conversion in nonlinear optical mixing experiments.
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Light speed reduction to 17 metres per second in an ultracold atomic gas
Lene Vestergaard Hau,Lene Vestergaard Hau,Stephen E. Harris,Zachary Dutton,Zachary Dutton,Cyrus H. Behroozi,Cyrus H. Behroozi +6 more
TL;DR: In this paper, an experimental demonstration of electromagnetically induced transparency in an ultracold gas of sodium atoms, in which the optical pulses propagate at twenty million times slower than the speed of light in a vacuum, is presented.
Journal ArticleDOI
Observation of electromagnetically induced transparency.
TL;DR: In this paper, the authors report the first demonstration of a technique by which an optically thick medium may be rendered transparent by applying a temporally smooth coupling laser between a bound state of an atom and the upper state of the transition which is to be made transparent.
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High-order harmonic generation from atoms and ions in the high intensity regime.
TL;DR: It is found that ions can produce harmonics comparable in strength to those obtained from neutrals, and that the emission extends to much higher order.
Journal ArticleDOI
Lasing without inversion
Jordi Mompart,Ramón Corbalán +1 more
TL;DR: In this article, the main motivation in inversionless lasing research was discussed, namely, the generation of short-wavelength laser light, and the basic physics of LWI in two-level and, eventually, in three-and multilevel atomic configurations.