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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 22, Iss. 4 — Apr. 1, 2005
  • pp: 767–772

Splitting of femtosecond laser pulses by using a Dammann grating and compensation gratings

Guowei Li, Changhe Zhou, and Enwen Dai  »View Author Affiliations


JOSA A, Vol. 22, Issue 4, pp. 767-772 (2005)
http://dx.doi.org/10.1364/JOSAA.22.000767


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Abstract

When a Dammann grating is used to split a beam of femtosecond laser pulses into multiple equal-intensity beams, chromatic dispersion will occur in beams of each order of diffraction and with different scale of angular dispersion because the incident ultrashort pulse contains a broad range of spectral bandwidths. We propose a novel method in which the angular dispersion can be compensated by positioning an m-time-density grating to collimate the mth-order beam that has been split, producing an array of beams that are free of angular dispersion. The increased width of the compensated output pulses and the spectral walk-off effect are discussed. We have verified this approach theoretically and validated it through experiments. It should be highly interesting in practical applications of splitting femtosecond laser pulses for pulse-width measurement, pump-probe measurement, and micromachining at multiple points.

© 2005 Optical Society of America

OCIS Codes
(050.1380) Diffraction and gratings : Binary optics
(050.2770) Diffraction and gratings : Gratings
(320.7080) Ultrafast optics : Ultrafast devices
(320.7160) Ultrafast optics : Ultrafast technology

History
Original Manuscript: October 27, 2004
Manuscript Accepted: November 1, 2004
Published: April 1, 2005

Citation
Guowei Li, Changhe Zhou, and Enwen Dai, "Splitting of femtosecond laser pulses by using a Dammann grating and compensation gratings," J. Opt. Soc. Am. A 22, 767-772 (2005)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-22-4-767


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