Optical arrangement for symmetrizing the radiation of...

G - Physics – 02 – B

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G02B 27/09 (2006.01) G02B 6/42 (2006.01) H01S 3/00 (2006.01) H01S 3/0941 (2006.01) H01S 5/40 (2006.01) H01S 5/00 (2006.01)

Patent

CA 2368958

The invention relates to an optical arrangement for symmetrizing the radiation of a plurality of laser diodes that are arranged adjacently to each other and on top of each other, in a fixed manner relative to each other. The output radiation of each laser diode is unsymmetrical in relation to a first direction (the y axis) and a second direction (the x axis) which are perpendicular in relation to each other. The inventive optical arrangement is particularly for use for symmetrizing the radiation of laser diode bars that are stacked on top of each other, forming a laser diode stack. A plurality of microcylindrical lens units (2a, 2b, 2c) with sufficient isoplanacy are arranged in such a way that they are tilted about the optical axis (the z axis) of the designated linear array of laser diodes, collimate the output beam bundles of the individual laser diodes of the designated linear array of laser diodes in direction y, deviating said output beam bundles to different degrees and separating them as they do so. The bundles (8) output from the laser diodes that are arranged on top of each other in direction y coincide at a set distance. A directional element (3) is mounted downstream of the microcylindrical lens unit (2a, 2b, 2c). This directional element diverts the beam bundle (8) of the individual laser diodes that are arranged adjacently to each other in direction x with different angles of deflection respectively, so that the central points of the individual beam bundles (8) coincide at a set distance. A redirecting element (5) is located at a distance behind the directional element (3) and compensates the different angles of deflection of the beam bundles (8) introduced by the directional element (3) in the plane xz.

L'invention concerne un dispositif optique pour rendre symétriques les rayonnements d'une pluralité de diodes laser qui sont juxtaposées et superposées en étant associées de manière fixe. Le rayonnement de sortie de chaque diode laser est asymétrique par rapport à une première direction (axe des y) et à une deuxième direction (axe des x) qui sont perpendiculaires l'une à l'autre. Ce dispositif optique sert en particulier à rendre symétriques les rayonnements de barres de diodes laser superposées de manière à former un empilement de diodes laser. Une pluralité de systèmes optiques à microlentilles cylindriques (2a, 2b, 2c) suffisamment aplanétiques sont basculés autour de l'axe optique (axe des z) du réseau linéaire associé de diodes laser, collimatent les faisceaux de sortie des diodes laser individuelles dudit réseau linéaire associé dans l'axe des y, les dévient de façon plus ou moins importante et les séparent, Les faisceaux (8) sortant des diodes laser superposées dans l'axe des y coïncident à une distance prédéterminée les uns des autres. Un élément directionnel (3) associé au système optique de microlentilles cylindriques (2a, 2b, 2c) dévient dans l'axe des x, selon différents angles de déviation, les faisceaux (8) des diodes laser individuelles juxtaposées dans l'axe des x, de sorte que les centres de gravité des faisceaux individuels (8) coïncident à une distance prédéterminée les uns des autres. Un élément de réorientation (3) placé à distance derrière l'élément directionnel (3) compense les différents angles de déviation des faisceaux (8), introduits par l'élément directionnel (3), dans le plan xz.

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