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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Vol. 16, Iss. 12 — Dec. 1, 1999
  • pp: 2285–2294

Potential of femtosecond chirp control of ultrabroadband semiconductor continuum nonlinearities

J. Kunde, U. Siegner, S. Arlt, G. Steinmeyer, F. Morier-Genoud, and U. Keller  »View Author Affiliations

JOSA B, Vol. 16, Issue 12, pp. 2285-2294 (1999)

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We present an experimental study of the influence of frequency chirp in 20-fs optical pulses on broadband semiconductor continuum nonlinearities. Differential-transmission (DT) measurements were performed in which either the exciting pump pulse or the readout probe pulse, or both pump and probe, were chirped. We demonstrate that in certain chirp configurations the spectrally integrated DT is enhanced on an ultrafast time scale compared with measurements with unchirped pulses. Therefore pulse chirping has the potential to improve and optimize all-optical ultrafast switching. Spectrally resolved DT measurements explain these findings. Positive and negative DT contributions are observed in different spectral ranges. The spectral position and the magnitude of these contributions change in time. Proper chirping of the pulses optimizes the readout of the positive contributions and maximizes the spectrally integrated DT. A simple quantitative model confirms these considerations.

© 1999 Optical Society of America

OCIS Codes
(320.1590) Ultrafast optics : Chirping
(320.7110) Ultrafast optics : Ultrafast nonlinear optics
(320.7130) Ultrafast optics : Ultrafast processes in condensed matter, including semiconductors

J. Kunde, U. Siegner, S. Arlt, G. Steinmeyer, F. Morier-Genoud, and U. Keller, "Potential of femtosecond chirp control of ultrabroadband semiconductor continuum nonlinearities," J. Opt. Soc. Am. B 16, 2285-2294 (1999)

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  26. The slight deviation between experimental and calculated SI DT curves for pump chirp may be caused by the underestimation of chirp effects owing to the grating-coupling term, previously observed in SR DT measurements.8 Underestimating grating-coupling-term effects may lead to small but noticeable deviations for pump chirp for which chirp effects owing to the direct-probe transmission term are weakest.

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