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Proceedings Paper

Diffraction-limited virtual point source microlenses
Author(s): Shawn W. Connely; James J. Snyder
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Paper Abstract

Fast cylindrical microlenses are an ideal solution for correcting astigmatism and beam ellipticity in laser diodes. Many laser diode applications require a diffraction limited non- astigmatic circular beam. The traditional way of accomplishing this is by use of an anamorphic prism pair in combination with a cylindrical lens. Through proper design it is possible to encompass the effects of these three elements in one microlens. Such an element is known as a virtual point source (VPS) microlens. The VPS microlens reduces the divergence of the fast- axis of a laser diode to that of the slow axis while at the same time forcing the fast and slow axis to appear to emanate from one point. Since a microlens has dimensions similar to those of multimode fibers it allows a laser diode to maintain its compact size while producing a diffraction limited circular wavefront. The design and implementation of the VPS microlens has been reported. A typical microlens has a working distance of 30 micrometers and requires sub-micron positioning accuracy as well as mounting techniques that can maintain this precision lens alignment over time. We address the issues of microlens characteristics, alignment tolerances, and bonding techniques.

Paper Details

Date Published: 12 May 1995
PDF: 9 pages
Proc. SPIE 2383, Micro-Optics/Micromechanics and Laser Scanning and Shaping, (12 May 1995); doi: 10.1117/12.209026
Show Author Affiliations
Shawn W. Connely, Blue Sky Research (United States)
James J. Snyder, Blue Sky Research (United States)


Published in SPIE Proceedings Vol. 2383:
Micro-Optics/Micromechanics and Laser Scanning and Shaping
M. Edward Motamedi; Leo Beiser, Editor(s)

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