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Applied Optics

Applied Optics


  • Vol. 39, Iss. 30 — Oct. 20, 2000
  • pp: 5488–5499

Design and performance of a refractive optical system that converts a Gaussian to a flattop beam

John A. Hoffnagle and C. Michael Jefferson  »View Author Affiliations

Applied Optics, Vol. 39, Issue 30, pp. 5488-5499 (2000)

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A system of two aspheric lenses is described, which efficiently converts a collimated Gaussian beam to a flattop beam. Departing from earlier designs, both aspheric surfaces were convex, simplifying their fabrication; the output beam was designed with a continuous roll-off, allowing control of the far-field diffraction pattern; and diffraction from the entrance and exit apertures was held to a negligible level. The design principles are discussed in detail, and the performance of the as-built optics is compared quantitatively with the theoretical design. Approximately 78% of the incident power is enclosed in a region with 5% rms power variation. The 8-mm-diameter beam propagates approximately 0.5 m without significant change in the intensity profile; when the beam is expanded to 32 mm in diameter, this range increases to several meters.

© 2000 Optical Society of America

OCIS Codes
(140.3300) Lasers and laser optics : Laser beam shaping
(220.1250) Optical design and fabrication : Aspherics
(220.2740) Optical design and fabrication : Geometric optical design

Original Manuscript: March 24, 2000
Revised Manuscript: June 19, 2000
Published: October 20, 2000

John A. Hoffnagle and C. Michael Jefferson, "Design and performance of a refractive optical system that converts a Gaussian to a flattop beam," Appl. Opt. 39, 5488-5499 (2000)

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