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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 12 — Jun. 12, 2006
  • pp: 5502–5507

Large spectral blue shifts in intense laser irradiation of microdroplets

M. Anand, P. Gibbon, and M. Krishnamurthy  »View Author Affiliations

Optics Express, Vol. 14, Issue 12, pp. 5502-5507 (2006)

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When methanol microdroplets of 15mm size are irradiated by intense femtosecond laser pulses of moderate intensities (<2×1016W cm-2), we observe a ‘red-light flash’ from the microplasma. We report on the presence of a large ‘blue shoulder’ (that extends to about 200 nm from the incident laser wavelength) in the scattered spectra that corresponds to the red-light flash. A prepulse is found to be essential for producing the large blue shift, which is attributed to the rapid subsequent ionization of a near-critical density preplasma when the main pulse is incident.

© 2006 Optical Society of America

OCIS Codes
(010.3310) Atmospheric and oceanic optics : Laser beam transmission
(190.2640) Nonlinear optics : Stimulated scattering, modulation, etc.
(320.2250) Ultrafast optics : Femtosecond phenomena
(320.7100) Ultrafast optics : Ultrafast measurements
(350.5400) Other areas of optics : Plasmas

ToC Category:
Nonlinear Optics

Original Manuscript: March 27, 2006
Revised Manuscript: May 12, 2006
Manuscript Accepted: May 16, 2006
Published: June 12, 2006

M. Anand, P. Gibbon, and M. Krishnamurthy, "Large spectral blue shifts in intense laser irradiation of microdroplets," Opt. Express 14, 5502-5507 (2006)

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Fig. 1. Fig. 2. Fig. 3.

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