THEORY OF NONLINEAR OPTICAL PHENOMENA IN EXTRINSIC SEMICONDUCTORS,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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The two-photon absorption and the second-harmonic generation in extrinsic n- and p-type semiconductors are theoretically considered. States of electrons are described within the framework of the band theory of solid body the interaction between radiation and solid-body electrons is examined R. Braunstein, Phys. Rev., 1961, 125, 475 R. Loudon, Proc. Phys. Soc., 1962, 80, 952. It is found that the absorption factor of w1 photons is proportional to the intensity of the second beam of w2 -frequency photons. Maximum 2-photon absorption is possible when one of the frequencies is low and the other is close to the frequency that corresponds to the fringe of self-absorption the effect of 2-photon absorption is stronger in those crystals in which the virtual band lies close to the conduction band. The effect of impurities on the 2-photon absorption donor and acceptor centers, high and low temperatures, concentration of impurities is investigated. Generation of the second harmonic is first considered in intrinsic semiconductors here, the band-structure effect is explored and then the effect of impurities is evaluated.
- Lasers and Masers
- Solid State Physics