Diffraction-limited virtual point source microlenses

Shawn W. Connely; James J. Snyder

doi:10.1117/12.209026

12 May 1995 Diffraction-limited virtual point source microlenses

Shawn W. Connely, James J. Snyder

Proceedings Volume 2383, Micro-Optics/Micromechanics and Laser Scanning and Shaping; (1995) https://doi.org/10.1117/12.209026
Event: Photonics West '95, 1995, San Jose, CA, United States

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.

Citation Download Citation

Shawn W. Connely and James J. Snyder "Diffraction-limited virtual point source microlenses", Proc. SPIE 2383, Micro-Optics/Micromechanics and Laser Scanning and Shaping, (12 May 1995); https://doi.org/10.1117/12.209026

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