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Free carrier absorption in quantum cascade structures
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Free carrier absorption in quantum cascade structures
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We show that the free carrier absorption in Quantum Cascade Lasers is very small and radically different from the classical Drude result on account of the orthogonality between the direction of the carrier free motion and the electric field of the laser emission. A quantum mechanical calculation of the free carrier absorption and inter-subband oblique absorption induced by interface defects, coulombic impurities and optical phonon absorption/emission is presented for QCL's with a double quantum well design. The interaction between the electrons and the optical phonons dominates at room temperature.
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