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Time and Frequency Resolved Intersubband Spectroscopy of Quantum Well Structures
Author(s) -
Kaiser J.,
Seilmeier A.
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<205::aid-pssb205>3.0.co;2-e
Subject(s) - picosecond , laser linewidth , absorption spectroscopy , spectroscopy , quantum well , excited state , electronic band structure , absorption (acoustics) , electron , relaxation (psychology) , materials science , spectral line , atomic physics , molecular physics , chemistry , condensed matter physics , optics , physics , laser , psychology , social psychology , quantum mechanics , astronomy
In a modulation‐doped GaAs/Al x Ga 1— x As quantum well structure electrons are excited from the lowest to higher subbands by a picosecond IR pulse. Transient intersubband absorption spectra taken with picosecond time resolution during the relaxation process reveal shifts of the broad intersubband absorption band due to dynamic changes of the band structure. The broad absorption profile, however, remains nearly unchanged indicating only weak inhomogeneous contributions to the linewidth.