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New Approaches Improve Beam Expansion

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Dr. Ulrike Fuchs and Sven R. Kiontke, Asphericon GmbH

Afocal beam expansion systems based on the basic principles of Kepler and Galileo telescopes can be improved in terms of wavefront quality by using additional optical surfaces or aspherizing them using monolithic beam expansion elements. Everyday work in an optics laboratory would be unthinkable without beam expansion systems, which optimally adjust beam cross sections between the light sources (e.g., lasers) and the subsequent optical elements. Precise illumination of the optically effective surfaces is essential, especially for beam shaping and focusing with high numerical apertures....Read full article

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    Published: March 2014
    Glossary
    achromatic
    Color correcting; chromatic aberration corrected.
    beam
    1. A bundle of light rays that may be parallel, converging or diverging. 2. A concentrated, unidirectional stream of particles. 3. A concentrated, unidirectional flow of electromagnetic waves.
    curvature
    The measure of departure from a flat surface, as applied to lenses; the reciprocal of radius. Applies to any surface, including lenses, mirrors and image surfaces.
    illumination
    The general term for the application of light to a subject. It should not be used in place of the specific quantity illuminance.
    optical
    Pertaining to optics and the phenomena of light.
    telescope
    An afocal optical device made up of lenses or mirrors, usually with a magnification greater than unity, that renders distant objects more distinct, by enlarging their images on the retina.
    wavefront
    In considering a field of electromagnetic energy emanating from a source, the wavefront is a surface connecting all field points that are equidistant from the source.
    wavelength
    Electromagnetic energy is transmitted in the form of a sinusoidal wave. The wavelength is the physical distance covered by one cycle of this wave; it is inversely proportional to frequency.
    afocal
    An optical system with object and image points at infinity. Literally, "without a focal length."
    aspherizing
    The modification of the spherical surfaces in an optical system to correct for spherical aberration.
    achromaticaperturesasphericon GmbHbeamCenterconstructioncurvaturedivergentEuropeexpansionFeaturesfocalfocusingGalileoGermanyilluminationJenaKeplerlengthslensesLight SourcesmeniscusmonolithicopticalOpticsqualityshapingspherical aberrationssurfacestelescopeTi:sapphirewavefrontwavelengthafocalaspherizingcross sectionsconvergentgroupsaspherizemonolithicalcombinatoricsUlrike FuchsSven R. KiontkeLasers

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