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VOLUME 14 (1971) | ISSUE 2 | PAGE 85
Pulsed Narrowing of p-n Junctions in Two-photon Excitation
Two-photon absorption in homogeneous crystals has been investigated in sufficient detail. There are practically no published data, however, on two-photon excitation of p-n Junctions and heterojunctions. The reason for this can be understood if it is recognized that such crystals contain impurities that lead to the single-photon excitation mechanism. One should expect, however, the impurity centers to become depleted at sufficiently high excitation levels and generation of electron-hole pairs in the volume to begin. If this process is active enough, then considerable changes in the properties of the p-n junction should occur. To reveal such changes, the following experiment was organized.