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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Vol. 21, Iss. 9 — Sep. 1, 2004
  • pp: 1693–1698

Features of a phase-only shaper set for a long rectangular pulse

S. Cialdi, I. Boscolo, and A. Flacco  »View Author Affiliations

JOSA B, Vol. 21, Issue 9, pp. 1693-1698 (2004)

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The generation of electron pulses of high peak current and low emittance in a 3-GHz radio-frequency electron gun requires the illumination of the photocathode by a rectangular-shaped 10-ps light beam with a rise time of less than 1 ps. The generation of this kind of laser pulse needs the insertion of a programmable pulse shaper into a femtosecond laser system. The shaping system that we discuss is a spectral phase-only filter. A genetic algorithm, in conjunction with a proper cost function, is used to determine the phase filter function for the desired square-pulse generation. Simulations show that the system is highly sensitive to the properties of the input signal and to alignment. Third-harmonic generation, as required by photoemission, leads to some relaxation in the settings of the system.

© 2004 Optical Society of America

OCIS Codes
(000.4430) General : Numerical approximation and analysis
(320.5540) Ultrafast optics : Pulse shaping
(320.7110) Ultrafast optics : Ultrafast nonlinear optics

S. Cialdi, I. Boscolo, and A. Flacco, "Features of a phase-only shaper set for a long rectangular pulse," J. Opt. Soc. Am. B 21, 1693-1698 (2004)

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