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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 35, Iss. 17 — Sep. 1, 2010
  • pp: 2973–2975

Near-diffraction-limited flattop laser beam adaptively generated by stochastic parallel gradient descent algorithm

Haotong Ma, Zejin Liu, Xiaojun Xu, Sanhong Wang, and Changhai Liu  »View Author Affiliations


Optics Letters, Vol. 35, Issue 17, pp. 2973-2975 (2010)
http://dx.doi.org/10.1364/OL.35.002973


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Abstract

We demonstrate the adaptive generation of a near-diffraction-limited flattop laser beam in the near field based on the stochastic parallel gradient descent algorithm and dual-phase-only liquid crystal spatial light modulators (LC-SLMs). One LC-SLM redistributes the intensity, and the other compensates the wavefront of the output beam. The experimental results show that approximately 69% of the power is enclosed in a region with less than 6% rms intensity variation. The 5 mm diameter near-diffraction-limited output beam retains a flattop intensity distribution without significant diffraction peaks for a working distance of more than 30 cm .

© 2010 Optical Society of America

OCIS Codes
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(140.3300) Lasers and laser optics : Laser beam shaping
(230.6120) Optical devices : Spatial light modulators

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: June 16, 2010
Revised Manuscript: July 26, 2010
Manuscript Accepted: August 1, 2010
Published: August 27, 2010

Citation
Haotong Ma, Zejin Liu, Xiaojun Xu, Sanhong Wang, and Changhai Liu, "Near-diffraction-limited flattop laser beam adaptively generated by stochastic parallel gradient descent algorithm," Opt. Lett. 35, 2973-2975 (2010)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-35-17-2973


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