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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 12 — Jun. 7, 2010
  • pp: 12104–12110

Study on the time-varying and propagating characteristics of ultrashort pulse Laguerre-Gaussian beam

Yi-Dong Liu and Chunqing Gao  »View Author Affiliations

Optics Express, Vol. 18, Issue 12, pp. 12104-12110 (2010)

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This work proposes a simple model of pulse Laguerre-Gaussian Beam (LGB) by chopping the incident continuous wave LGB into ultrashort pulse. The pulse LGB is expanded into a series of LGBs with the same angular quantum number (AQN) but different radial quantum number (RQN). The expansion coefficients may show the time-varying and propagating characteristics of the pulse helical beam. Bigger RQN of the incident LGB will cause more serious mode dispersion. This work discusses emphatically the cases that the incident LGBs have zero RQN, in which the original mode, i.e. the same eigen-mode as the incident beam, can be used to approximate the pulse LGB in short propagating range, e.g. 2zR . The original mode decreases, spreads and delays when propagating, and it’s more evident for incident LGB with larger AQN. These conclusions are important for the optical communication that uses the orbital angular momentum division multiplexing (OAM-DM) technology.

© 2010 Optical Society of America

OCIS Codes
(060.4510) Fiber optics and optical communications : Optical communications
(320.2250) Ultrafast optics : Femtosecond phenomena
(320.5550) Ultrafast optics : Pulses
(350.5500) Other areas of optics : Propagation

ToC Category:
Physical Optics

Original Manuscript: April 5, 2010
Revised Manuscript: May 11, 2010
Manuscript Accepted: May 12, 2010
Published: May 24, 2010

Yi-Dong Liu and Chunqing Gao, "Study on the time-varying and propagating characteristics of ultrashort pulse Laguerre-Gaussian beams," Opt. Express 18, 12104-12110 (2010)

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