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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 21 — Jul. 20, 2011
  • pp: 4174–4179

Generation of dark hollow femtosecond pulsed beam by phase-only liquid crystal spatial light modulator

Yongming Nie, Haotong Ma, Xiujian Li, Wenhua Hu, and Jiankun Yang  »View Author Affiliations


Applied Optics, Vol. 50, Issue 21, pp. 4174-4179 (2011)
http://dx.doi.org/10.1364/AO.50.004174


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Abstract

Based on the refractive laser beam shaping system, the dark hollow femtosecond pulse beam shaping technique with a phase-only liquid crystal spatial light modulator (LC-SLM) is demonstrated. The phase distribution of the LC-SLM is derived by the energy conservation and constant optical path principle. The effects of the shaping system on the temporal properties, including spectral phase distribution and bandwidth of the femtosecond pulse, are analyzed in detail. Experimental results show that the hollow intensity distribution of the output pulsed beam can be maintained much at more than 1200 mm . The spectral phase of the pulse is changed, and the pulse width is expanded from 199 to 230 fs , which is caused by the spatial–temporal coupling effect. The coupling effect mainly depends on the phase-only LC-SLM itself, not on its loaded phase distribution. The experimental results indicate that the proposed shaping setup can generate a dark hollow femtosecond pulsed beam effectively, because the temporal Gaussian waveform is unchanged.

© 2011 Optical Society of America

OCIS Codes
(120.5060) Instrumentation, measurement, and metrology : Phase modulation
(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: May 10, 2011
Revised Manuscript: June 22, 2011
Manuscript Accepted: June 22, 2011
Published: July 19, 2011

Citation
Yongming Nie, Haotong Ma, Xiujian Li, Wenhua Hu, and Jiankun Yang, "Generation of dark hollow femtosecond pulsed beam by phase-only liquid crystal spatial light modulator," Appl. Opt. 50, 4174-4179 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-21-4174

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