Improved pinhole spatial filter

Hariharan, P. ; Roy, M. (2007) Improved pinhole spatial filter Optics & Laser Technology, 39 (1). pp. 155-156. ISSN 0030-3992

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If the pinhole placed at the focus of a microscope objective to spatially filter a laser beam is replaced by an annular phase mask, it is possible to obtain a clean beam providing very nearly uniform illumination over an extended area. We now show that even better results can be obtained by adding an absorbing layer to the mask.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Laser Beams; Beam Expansion; Uniform Illumination
ID Code:12522
Deposited On:13 Nov 2010 13:25
Last Modified:03 Jun 2011 06:38

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