Diffractive shaping of the intensity distribution of a...

G - Physics – 02 – B

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G02B 27/09 (2006.01) H01S 3/10 (2006.01) H01S 5/00 (2006.01)

Patent

CA 2451325

A new method is introduced to shape the intensity distribution and improve the quality of a beam emitted by a spatially partially coherent source with the aid of a periodic diffractive optical element (704). Periodic diffractive elements are not suitable for shaping spatially coherent light fields in the sense described in the invention because of the appearance of strong constructive interference effects, but the partial spatial coherence of light fields emitted by multimode sources suppresses these effects. The invention can be applied to shaping of intensity distributions emitted by lasers, light- emitting diodes, or optical fibers either, at a finite distance from the source (703) or in the far field. The invention is particularly advantageous in the shaping and quality improvement of beams emanating from high-power excimer lasers, semiconductor lasers, resonance-cavity light-emitting diodes, or arrays of lasers or light-emitting diodes (702, 705).

L'invention concerne un procédé pour former la distribution d'intensité et améliorer la qualité d'un faisceau émis par une source spatialement en partie cohérente, au moyen d'un élément optique de diffraction périodique (704). Les éléments de diffraction périodique ne sont pas aptes à former des champs lumineux spatialement cohérents au sens décrit dans la présente invention, à cause de puissants effets d'interférence constructive, mais la cohérence spatiale partielle de champs lumineux émis par des sources multimodes supprime ces effets. Cette invention peut être appliquée pour former des distributions d'intensités émises par des lasers, des diodes électroluminescentes ou des fibres optiques, à une distance finie de la source (703) ou en champ éloigné. Ladite invention présente des avantages, en particulier pour former et améliorer la qualité de faisceaux émis par des dispositifs de grande puissance tels que des lasers à excimères, des lasers semiconducteurs, des diodes électroluminescentes à cavité résonnante, des ensembles de lasers ou de diodes électroluminescentes (702, 705).

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