Free electron laser-induced bleaching of the intersubband absorption in semiconductor quantum wells

B. N. Murdin, M. Helm, C. R. Pidgeon, K. K. Geerinck, N. Hovenyer, W. Th Wenckebach, A. F G van der Meer, P. W. van Amersfoort

Research output: Contribution to journalArticlepeer-review

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 (FELIX). Complete bleaching of the absorption is observed at I = 100 kW/cm2. When fitted with a two-level system, the saturation intensity is found to be 10 kW/cm2, which corresponds to a characteristic time constant of 1-2 ps. Possible interpretations are discussed in the situation of finite FEL pulse width. © 1994.

Original languageEnglish
Pages (from-to)178-180
Number of pages3
JournalNuclear Inst. and Methods in Physics Research, A
Volume341
Issue number1-3
Publication statusPublished - 1 Mar 1994

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