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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/5199

Title: Strong reducing of the laser focal volume
Authors: Godin, T
Ngcobo, S
Cagniot, E
Fromager, M
Forbes, A
Aït-Ameur, K
Keywords: Laser beam shaping
Super-resolution
Transverse modes
Focal volume
Photonics
Optics
Issue Date: Aug-2011
Publisher: SPIE
Citation: Godin, T, Ngcobo, S, Cagniot, E et al. 2011. Strong reducing of the laser focal volume. SPIE Optics + Photonics, San Diego, California, USA, 21-25 August 2011
Series/Report no.: Workflow request;7360
Abstract: Many applications of lasers seek nowadays for focal spots whose corresponding volume is getting smaller and smaller in order to ensure high spatial resolution. This problem, studied by many research groups around the world, is the core of this research work which deals with controlling the focal volume of a focused laser beam. Indeed, our objective is to develop a new method based on spatial treatment of laser beams, allowing to solve, in an original and efficient manner, two fundamental issues that have not been treated satisfactorily yet, i.e. : (i) The generation of a special laser beam, which has the ability to produce a focal volume smaller than the one resulting from a more common Gaussian beam, when focused by an ordinary lens. The expected reduction factor of the focal volume is in the order of several hundreds, when the existing methods do not exceed few tenths. (ii) The decoupling between transversal and longitudinal resolutions within the focal volume, contrary to Gaussian beams whose depth of field is proportional to the square of its beam-waist radius. The method that it is developed is based on two steps: First, the laser is forced to oscillate on a high-order but single transversal mode TEMp0, which is secondly spatially beam-shaped thanks a proper Diffractive Optical Element (DOE) that allocates the super-resolution feature.
Description: SPIE Optics + Photonics, San Diego, California, USA, 21-25 August 2011
URI: http://hdl.handle.net/10204/5199
Appears in Collections:Laser physics and technology
General science, engineering & technology

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