Frequency Upconversion in YF3: Yb3+,Tm3+

F. W. Ostermayer, Jr., J. P. van der Ziel, H. M. Marcos, L. G. Van Uitert, and J. E. Geusic
Phys. Rev. B 3, 2698 – Published 15 April 1971
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Abstract

The stepwise conversion of infrared (0.97μ) radiation to near infrared (0.81 μ) and visible (0.475 μ) light in YF3 sensitized with Yb3+ and activated with Tm3+ has been studied in detail. The lifetimes and fluorescence intensities of the important manifolds (YbF522, TmH43, TmF43, and TmG41), as well as the Yb-to-Tm transfer probability coefficients for the three steps of the process, have been measured as functions of concentration. A saturation effect previously observed in the Tm emission versus infrared excitation intensity has been shown to result from the rate of depopulation of TmH43 by the second Yb-to-Tm transfer exceeding the TmH43 decay rate. This was used to determine the second transfer probability coefficient. The first transfer probability coefficient was found to be 1.2×1017 cm3sec1 independent of Tm concentration and for Yb concentration of the order of 10 at.% and greater. The second transfer probability coefficient was found to be approximately 1014 cm3sec1 for Yb concentrations of 25 at.% and greater. The third transfer probability coefficient was found to be 2.7×1016 cm3sec1. The dependence on Yb concentration of the relative efficiency of conversion to 0.475-μ light agrees well with the values calculated from a rate-equation model using the measured lifetimes and transfer probability coefficients.

  • Received 5 October 1970

DOI:https://doi.org/10.1103/PhysRevB.3.2698

©1971 American Physical Society

Authors & Affiliations

F. W. Ostermayer, Jr., J. P. van der Ziel, H. M. Marcos, L. G. Van Uitert, and J. E. Geusic

  • Bell Telephone Laboratories, Murray Hill, New Jersey 07974

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Vol. 3, Iss. 8 — 15 April 1971

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