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Proceedings Paper

Lasers without inversion in quantum well intersubband transitions
Author(s): Atac Imamoglu; Kenneth Campman; Hans-Werner Schmidt; Rajeev Jagga Ram; Arthur C. Gossard
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Paper Abstract

We propose a new class of intersubband lasers and amplifiers that achieve net gain without population inversion. The laser scheme is based on a unipolar semiconductor double quantum- well structure where gain occurs at a transition between conduction band subbands. In order to achieve net gain without inversion, we utilize Fano-type interferences. The semiconductor laser scheme that we are considering is analogous to the atomic lambda system that has been extensively analyzed in the context of electromagnetically induced transparency and lasing without inversion. A coherent coupling field however, is not required in the present scheme. The electronic coherence necessary for Fano-type interferences is established by resonant tunneling. For nonlinear optics applications, the asymmetry of the structure allows for (chi) (2) processes and therefore higher conversion efficiency or parametric gain.

Paper Details

Date Published: 10 May 1996
PDF: 9 pages
Proc. SPIE 2798, Coherent Phenomena and Amplification without Inversion, (10 May 1996); doi: 10.1117/12.239474
Show Author Affiliations
Atac Imamoglu, Univ. of California/Santa Barbara (United States)
Kenneth Campman, Univ. of California/Santa Barbara (United States)
Hans-Werner Schmidt, Univ. of California/Santa Barbara (United States)
Rajeev Jagga Ram, Univ. of California/Santa Barbara (United States)
Arthur C. Gossard, Univ. of California/Santa Barbara (United States)


Published in SPIE Proceedings Vol. 2798:
Coherent Phenomena and Amplification without Inversion
A. L. Andreev; Olga A. Kocharovskaya; Paul Mandel, Editor(s)

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