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Proceedings Paper

Diffractive photonic-crystal pumping of power lasers
Author(s): Renat R. Letfullin; Henk F. Arnoldus; John T. Foley
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Paper Abstract

In the present report a novel diffractive technique for effective optical pumping of power chemical lasers by external coherent radiation is proposed. This technique utilizes a bicomponent diffraction system coupled structurally to the unstable telescopic cavity of the laser. The space localization of the electromagnetic field inside the proposed optical scheme represents a periodic structure of diffractive maxima in the near field-zone and a narrow paraxial diffraction channel with high intensity in the far-field zone. In the Fresnel diffraction zone, the optical effect of multifocal diffractive focusing of the radiation is observed. Here the intensity in the central peaks can exceed by a factor of six (for spherical waves) to ten (for plane waves) the value of the incident wave intensity. The diffractive focusing of the input radiation opens the possibility to create a narrow diffraction initiation channel inside the laser cavity with a given space distribution and a high intensity. This technique provides a high efficiency for optical pumping and makes it possible to get a huge value of the laser energy gain. Calculations show that the ignition of laser-chemical reactions in the diffraction initiation channel under the condition of diffractive focusing of input radiation allows the laser energy to reach a gain of up to 109.

Paper Details

Date Published: 5 June 2003
PDF: 9 pages
Proc. SPIE 4971, Gas and Chemical Lasers and Intense Beam Applications IV, (5 June 2003); doi: 10.1117/12.472743
Show Author Affiliations
Renat R. Letfullin, Mississippi State University (United States)
Henk F. Arnoldus, Mississippi State Univ. (United States)
John T. Foley, Mississippi State Univ. (United States)

Published in SPIE Proceedings Vol. 4971:
Gas and Chemical Lasers and Intense Beam Applications IV
Steven J. Davis; Michael C. Heaven, Editor(s)

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