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Proceedings Paper

Beam shaping in resonators with conical reflectors
Author(s): Yurij N. Parkhomenko; Boris Spektor; Joseph Shamir
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Paper Abstract

Shaping laser beams within the laser cavity can improve the laser power efficiency and allows the generation of predetermined beam structures suitable for various applications such as metrology, lithography and particle manipulation. In this work we study a resonator in which one of the mirrors is replaced by a conical reflector and derive resonator parameters for required beam selections. For example, we show that choosing a negative cone angle can lead to oscillation on pure high-order modes corresponding to the first and second order Bessel functions in the resonator integral equation kernels. These modes possess a distinct zero intensity on the axis that can be exploited for applications such as singular beam metrology and particle manipulation. To generate the specific beam structures we found optimal cone angles and mirror sizes for stable resonators with two configurations, close to flat and to concentric. These optimal conditions were derived by requiring that the selected mode has minimal diffraction loss. It is shown that the selection of these higher-order modes is more efficient in the concentric configuration.

Paper Details

Date Published: 19 February 2009
PDF: 8 pages
Proc. SPIE 7194, Laser Resonators and Beam Control XI, 719405 (19 February 2009); doi: 10.1117/12.808382
Show Author Affiliations
Yurij N. Parkhomenko, Technion-Israel Institute of Technology (Israel)
Boris Spektor, Technion-Israel Institute of Technology (Israel)
Joseph Shamir, Technion-Israel Institute of Technology (Israel)

Published in SPIE Proceedings Vol. 7194:
Laser Resonators and Beam Control XI
Alexis V. Kudryashov; Alan H. Paxton; Vladimir S. Ilchenko; Lutz Aschke, Editor(s)

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