Synthesis of light needles with tunable length and nearly constant irradiance.

LC 2012 Spatial Light Modulators
Beam Shaping / Beam Steering
Published on:
Authors: Martínez-Herrero, Rosario and Maluenda, David and Juvells, Ignasi and Carnicer, Artur
Abstract:

“We introduce a new method for producing optical needles with tunable length and almost constant irradiance based on the evaluation of the on-axis power content of the light distribution at the focal area. According to theoretical considerations, we propose an adaptive modulating continuous function that presents a large derivative and a zero value jump at the entrance pupil of the focusing system. This distribution is displayed on liquid crystal devices using holographic techniques. In this way, a polarized input beam is shaped and subsequently focused using a high numerical aperture (NA) objective lens. As a result, needles with variable length and nearly constant irradiance are produced using conventional optics components. This procedure is experimentally demonstrated obtaining a 53λ-long and 0.8λ-wide needle.”

Open Access

Publication: Scientific Reports
Issue/Year: Scientific Reports
DOI: 10.1038/s41598-018-21007-7
Link: https://doi.org/10.1038/s41598-018-21007-7

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