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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 26 — Dec. 20, 2010
  • pp: 27723–27730

Adaptive conversion of multimode beam to near-diffraction-limited flattop beam based on dual-phase-only liquid-crystal spatial light modulators

Haotong Ma, Haichuan Zhao, Pu Zhou, Xiaolin Wang, Yanxing Ma, Xiaojun Xu, and Zejin Liu  »View Author Affiliations

Optics Express, Vol. 18, Issue 26, pp. 27723-27730 (2010)

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We propose and demonstrate the adaptive conversion of a multimode beam into a near-diffraction-limited flattop beam in the near field based on a combination of dual-phase-only liquid-crystal spatial light modulators (LC-SLMs) and the stochastic parallel gradient descent (SPGD) algorithm. One phase-only LC-SLM redistributes the intensity of the multimode beam, and the other compensates the wavefront of the output beam. The SPGD algorithm adaptively optimizes the phase distributions of dual-phase-only LC-SLMs to reduce the variance between the actual beam shape and the target beam shape. The experimental results on a fiber multimode beam show that the system is capable of adaptively creating square and rectangle flattop beams with desired parameters. Beam quality can be greatly improved by this system. The power in the main lobe of the far-field spot is about 4 times larger than that of the input multimode beam.

© 2010 OSA

OCIS Codes
(220.1080) Optical design and fabrication : Active or adaptive optics

ToC Category:
Adaptive Optics

Original Manuscript: August 30, 2010
Revised Manuscript: October 27, 2010
Manuscript Accepted: November 18, 2010
Published: December 16, 2010

Haotong Ma, Haichuan Zhao, Pu Zhou, Xiaolin Wang, Yanxing Ma, Xiaojun Xu, and Zejin Liu, "Adaptive conversion of multimode beam to near-diffraction-limited flattop beam based on dual-phase-only liquid-crystal spatial light modulators," Opt. Express 18, 27723-27730 (2010)

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