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Physics of gain and stimulated emission in ZnSe‐based quantum well lasers
Author(s) -
Ding J.,
Kozlov V.,
Kelkar P.,
Salokatve A.,
Nurmikko A. V.
Publication year - 1995
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/pssb.2221880112
Subject(s) - lasing threshold , quantum well , laser , femtosecond , optoelectronics , exciton , physics , optical pumping , diode , semiconductor laser theory , spontaneous emission , coulomb , optics , electron , condensed matter physics , quantum mechanics
Spectroscopic work is reviewed which focuses on the microscopic mechanism of gain in ZnSe‐based quantum well (QW) lasers, under optical and electrical injection, respectively. In particular, the lasing process in optically pumped ZnCdSe/ZnSe QW lasers at cryogenic temperatures is shown to be entirely an excitonic process. This conclusion is supported by results from resonant pumping experiments and femtosecond pump–probe measurements. A phenomenological model is presented, which can explain the experimental observation rather well. More strikingly for this strong quasi‐two‐dimensional (2D) exciton system, recent studies on room temperature ZnCdSe/ZnSSe/ZnMgSSe diode lasers show that pairwise electron–hole Coulomb correlation remains relevant in this case as well.