Dr. Marie-Claude Gagne Profile

Dr. Marie-Claude Gagne

Industrial Technology Advisor at National Research Council Canada

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Proceedings Article | 15 December 2000 Paper

Laser fluorescence inhibition at the interface of a glass and an optically thick Cs vapor

Jean-Marie Gagne, Karine Le Bris, Francois Babin, Marie-Claude Gagne

Proceedings Volume 4087, (2000) https://doi.org/10.1117/12.406359

KEYWORDS: Thin films, Optical filters, Reflection, Chemical species, Glasses, Laser energy, Luminescence, Interfaces, Cesium, Absorption

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A fluorescence radiation inhibition has been observed by absorption of a laser beam at a resonance of 852 nm at the interface of a Pyrex cell containing optically thick Cesium vapor. One observes a hole of GHz magnitude at the center of the retro-fluorescence signal associated with the lines of hyperfine structure 62P312-625112 (F =4,3). This phenomenon of inhibition, similar to a self-reversal of spectral lines, is found in the radiation generated by pooling effect. It occurs without a significant change in the absorption rate of laser energy. This is attributed to a coupling between atoms excited to 62P312 by laser pumping and a deposit of Cesium of atomic dimensions on the glass. At resonance, an important proportion of the atoms excited by the laser is in the vicinity of a thin conducting film. The non-radiating transformation process of the atomically excited energy to thermal energy is therefore favored. The interface lit by a monochromatic laser diode acts as a stop band filter and as a secondary luminous source. The width of the filter at half-height is proportional to the density of the atomic vapor. Sub-Doppler effects in inhibition spectral band have been observed. We present new experimental results and a phenomenon-related study of fluorescence inhibition induced by interfaced laser.

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