Systems and techniques for generating Bessel beams
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United States of America Patent
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Jan 22, 2013
Grant Date -
Oct 15, 2009
app pub date -
Mar 5, 2009
filing date -
Apr 10, 2008
priority date (Note) -
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Abstract
A technique is described for generating a Bessel beam. An input optical fiber is provided that supports propagation in the fundamental mode. The input fiber is connected to a fiber mode converting device that provides phase matching, at a predetermined excitation wavelength, between the fundamental mode and a selected azimuthally symmetric higher-order mode. As an input to the fiber mode converting device, a coherent light beam is fed through the input optical fiber to provide a fundamental mode input at the excitation wavelength. The fiber mode converting device resonantly excites the selected azimuthally symmetric mode. The azimuthally symmetric mode is provided as a beam output from an endface of the fiber mode converting device to approximate a Bessel beam.
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