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Title: Modified pinhole spatial filter producing a clean flat-topped beam
Authors: Hariharan, P.
Narayanan, Andal
Keywords: Laser beams
Beam expansion;
Uniform illumination
Issue Date: Mar-2004
Publisher: Elsevier B.V.
Citation: Optics & Laser Technology, 2004, Vol.36, p151-153
Abstract: The expanded beam from a laser has a sharply peaked intensity profile. As a result, in many applications where uniform illumination of an extended field is required, it is only possible to use the central part of the beam. We show that if the pinhole normally used to spatially filter the beam is replaced by an annular phase mask, it should be possible to obtain a clean beam providing very nearly uniform illumination over an extended area, with a minimal loss of light.
Description: Restricted Access.
ISSN: 0030-3992
Alternative Location:
Copyright: 2004 Elsevier B.V.
Appears in Collections:Research Papers (LAMP)

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