Valence intersubband gain without population inversion

Pereira, Mauro

doi:10.2478/s11534-009-0061-5

Cited by 2 publications

(2 citation statements)

References 24 publications

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“…On the other hand, the material parameters for the III-V system investigated here are very well known. This review complements the results given recently in [18], [19] comparing and contrasting the results for two different well widths.…”

Section: Lasing Without Population Inversionsupporting

confidence: 77%

“…The valence bands in contrast have typically lower averaged effective masses in the upper lasing subband which is an advantage. However, as the nonparabolicity can be in some cases so strong that an effective mass does not make sense and the full dispersions must be used, which can complicate the numerical calculations enormously, specially if many particle and dephasing effects are taken into account [18], [19].…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

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A Microscopic Approach for THz Intersubband Challenges

Pereira

2009

JTIT

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The main candidate to be a practical and low cost high power THz source is the intersubband-based quantum cascade laser, which can have a tremendous impact in many practical applications, including last mile and indoor telecommunication systems. In this review we discuss current challenges for THz intersubband device development from a microscopic point of view. Next summarize the search for new mechanisms and structure designs that can lead to intersubband gain without population inversion. This is a very important topic of current research, since is both an extremely elegant phenomenon from the basic physics of view and crucial for effective lasing in the THz range. The reason is that scattering phenomena can lead to level broadenings of the same order of magnitude of the lasing transitions, making population inversion by carrier injection in upper lasing subbands extremely difficult. Previous work in the literature is compared and contrasted with a new scheme that may lead to high temperature lasing by engineering the nonequilibrium population inversion with a combination of band structure and many body effects mediated by a k-space filter.

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Section: Lasing Without Population Inversionsupporting

confidence: 77%

Section: Numerical Results and Discussionmentioning

confidence: 99%