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10 May 1996 Lasers without inversion in quantum well intersubband transitions
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Proceedings Volume 2798, Coherent Phenomena and Amplification without Inversion; (1996)
Event: International Conference on Coherent and Nonlinear Optics, 1995, St. Petersburg, Russian Federation
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.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Atac Imamoglu, Kenneth Campman, Hans-Werner Schmidt, Rajeev Jagga Ram, and Arthur C. Gossard "Lasers without inversion in quantum well intersubband transitions", Proc. SPIE 2798, Coherent Phenomena and Amplification without Inversion, (10 May 1996);

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