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25 April 2006 On-fiber diffractive microrelief design for efficient control of the waveguiding beam
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Abstract
Introduction of diffractive optical elements (DOEs) opened the possibility to control field distribution in the cross-section of laser beam. In fact, by use of DOE one can focus the laser beam into predicted areas as well as form the beam with pre- given behavior propagation through waveguide medium. Diffractive optical element is the plate made from optical material (substrate) with diffractive micro-relief realized on the one or both sides of the plate. Note, that the diffractive micro- relief can be realized directly on the waveguide surface as well. Some applications need the focusing of the output waveguiding beam into predicted area. Generally, one can use diffractive micro-relief on the output end face of the waveguide in the case of excitement of selected waveguide mode. Other applications need selected waveguide mode excitement for fiber sensor sensitivity improvement. In the present paper it is suggested to use micro-relief on the input waveguide cross-section for effective excitement of selected mode. The strategy of the search of Gaussian mode with intensity distribution closed to the illuminating beam intensity distribution is suggested to be used. Corresponding numerical procedure is described. Computer simulation results as well as first experimental results are presented.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
V. S. Pavelyev "On-fiber diffractive microrelief design for efficient control of the waveguiding beam", Proc. SPIE 6187, Photon Management II, 61870S (25 April 2006); https://doi.org/10.1117/12.663844
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