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Studies of tunable four-photon parametric fluorescence of crystals in the visible region

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Abstract

Tunable four-photon parametric fluorescence, which is valuable for investigating material nonlinearities and parametric devices, was studied theoretically and experimentally.

Theoretical analysis leads to the conclusion that the emitted power depends directly on the focusing of the pumping beam, unlike the process of three-photon parametric fluorescence which is independent of the focusing of the pumping beam. The calculation of the phasematching conditions for nonlinear crystals such as KDP, ADP, TiO2 and CdS shows that collinear phase-matching can be realised over the visible region using a ruby laser for pumping. Experimentally, tunable emission was observed in the visible range from 4200 Å to 5300 Å with KDP and ADP crystals pumped by a Q-switched ruby laser.

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Authors and Affiliations

  1. Research Institute of Electrical Communication, Tohoku University, Sendai, Japan

    H. Ito & H. Inaba

Authors
  1. H. Ito
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  2. H. Inaba
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Ito, H., Inaba, H. Studies of tunable four-photon parametric fluorescence of crystals in the visible region. Opto-electronics 2, 81–84 (1970). https://doi.org/10.1007/BF01419156

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  • DOI: https://doi.org/10.1007/BF01419156

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