Complete bleaching of the intersubband absorption in GaAs/AlGaAs quantum wells using a far-infrared free-electron laser

M. Helm, T. Fromherz, B. N. Murdin, C. R. Pidgeon, K. K. Geerinck, N. J. Hovenyer, W. Th Wenckebach, A. F G Van Der Meer, P. W. Van Amersfoort

Research output: Contribution to journalArticle

Abstract

The intensity-dependent intersubband absorption in GaAs/AlGaAs quantum wells with a subband separation smaller than the optical phonon energy has been measured with a pulsed far-infrared free-electron laser. Complete bleaching of the absorption is observed at I=200 kW/cm2. Fitting the data with a two-level system yields a characteristic time constant of 1-2 ps. Possible interpretations, considering the finite pulse width of the laser, are discussed.

Original languageEnglish
Pages (from-to)3315-3317
Number of pages3
JournalApplied Physics Letters
Volume63
Issue number24
DOIs
Publication statusPublished - 1993

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