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Proceedings Paper

Beam shaping for multimode beams
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Paper Abstract

The transformation of a given incoming wave front into a certain intensity distribution is an interesting task for micro optics with applications, for instance, in material processing and display illumination. For the design of a beam shaping element, the amplitude and the phase of the illumination wave have to be known at least in one plane. If the light source for the beam shaping problem is a high power laser or a multi mode fiber, the illumination wave is not the fundamental mode but the superposition of many modes with fluctuating fractions of intensity. This means that the amplitude and the phase of the beam can not be expressed analytically. However, the average amplitude can be calculated using the measured intensity distribution while the phase is unknown. Therefore we applied a method where the phase of the real illumination wave is approximated by a representative phase distribution which can be assumed from the propagation of the multi mode beam. With this approximation, we calculated refractive beam shaping elements using well known numerical methods based on wave optics. The beam shaping elements were fabricated using gray tone lithography which is a well suited technology for the fabrication of continuous surface profiles. We will present results of the application of such an element to shape the beam from a multi mode fiber.

Paper Details

Date Published: 9 November 2001
PDF: 6 pages
Proc. SPIE 4440, Lithographic and Micromachining Techniques for Optical Component Fabrication, (9 November 2001); doi: 10.1117/12.448054
Show Author Affiliations
Lars-Christian Wittig, Friedrich-Schiller-Univ. Jena (Germany)
Matthias Cumme, Friedrich-Schiller-Univ. Jena (Germany)
Stefan Nolte, Friedrich-Schiller-Univ. Jena (Germany)
Ernst-Bernhard Kley, Friedrich-Schiller-Univ. Jena (Germany)
Andreas Tuennermann, Friedrich-Schiller-Univ. Jena (Germany)

Published in SPIE Proceedings Vol. 4440:
Lithographic and Micromachining Techniques for Optical Component Fabrication
Ernst-Bernhard Kley; Hans Peter Herzig, Editor(s)

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