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Optically pumped four-level infrared laser based on intersubband transitions in multiple quantum wells: feasibility study

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2 Author(s)
Sun, Gang ; Dept. of Electr. & Comput. Eng., Johns Hopkins Univ., Baltimore, MD, USA ; Khurgin, J.B.

The feasibility of optically pumped infrared laser based on the intersubband transitions in multiple quantum wells is studied theoretically. The criteria for population inversion and efficient lasing operations are established. A system consisting of a superlattice with four quantum wells per period is proposed and shown to satisfy the criteria. The relaxation processes are investigated, giving the electron-phonon interaction a rigorous theoretical treatment. It is shown that in the proposed structure, optical gain in excess of 300 cm -1 can be realized under practical pumping conditions. Modification and optimization of the proposed laser are discussed

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Quantum Electronics, IEEE Journal of  (Volume:29 ,  Issue: 4 )