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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 8 — Apr. 16, 2007
  • pp: 4943–4952

Multi-dimensional observation of white-light filaments generated by femtosecond laser pulses in condensed medium

Jianjun Yang and Guoguang Mu  »View Author Affiliations

Optics Express, Vol. 15, Issue 8, pp. 4943-4952 (2007)

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The generation dynamics of white-light filaments in a transparent condensed medium is investigated experimentally in both spatiotemporal and frequency domains. We visualize the creation of multiple refocusing filaments with gradual increase of laser power by characterizing their spatial distributions of plasma luminescence and corresponding far-field emission patterns. The spatial fusion of multiple refocusing filaments into a single relatively long plasma channel is found to take place at higher laser powers. The measurement of supercontinua indicates that filamentation of ultrashort laser pulses in dispersive bulk media is closely connected with subsequent temporal events of pulse single splitting, then multiple splittings and finally coalescence. In addition, typical interference patterns of far-field emission are observed in the experiment, which reveals the spatial coherent properties among transverse filaments that are produced by a single laser beam.

© 2007 Optical Society of America

OCIS Codes
(320.2250) Ultrafast optics : Femtosecond phenomena
(320.7130) Ultrafast optics : Ultrafast processes in condensed matter, including semiconductors

ToC Category:
Ultrafast Optics

Original Manuscript: January 31, 2007
Revised Manuscript: March 22, 2007
Manuscript Accepted: March 23, 2007
Published: April 9, 2007

Jianjun Yang and Guoguang Mu, "Multi-dimensional observation of white-light filaments generated by femtosecond laser pulses in condensed medium," Opt. Express 15, 4943-4952 (2007)

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