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Ultrafast Dynamics of Nonlinear Intersubband Absorption in n‐Type Modulation Doped GaInAs/AlInAs Quantum Wells
Author(s) -
Kaindl R. A.,
Lutgen S.,
Woerner M.,
Elsaesser T.,
Hase A.,
Künzel H.
Publication year - 1997
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(199711)204:1<212::aid-pssb212>3.0.co;2-m
Subject(s) - femtosecond , quantum well , ultrashort pulse , doping , absorption (acoustics) , thermalisation , relaxation (psychology) , ultrafast laser spectroscopy , materials science , optoelectronics , electron , laser , atomic physics , optics , physics , psychology , social psychology , quantum mechanics
The nonlinear intersubband absorption of a quasi‐two‐dimensional electron plasma in n‐type modulation doped Ga 0.47 In 0.53 As/Al 0.48 In 0.52 As multiple quantum wells is investigated by femtosecond pump–probe measurements in the mid‐infrared. We observe a strong dependence of the transient nonlinear intersubband absorption on the spectral position of the pulses within the intersubband absorption line. The time‐resolved measurements demonstrate that the absorption dynamics is determined not only by intersubband relaxation with a time constant of 1.3 ps but also by the intrasubband thermalization and subsequent cooling of the n = 1 electron distribution.