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EFFICIENT, HIGH‐POWER COHERENT EMISSION FROM Ho3+ IONS IN YTTRIUM ALUMINUM GARNET, ASSISTED BY ENERGY TRANSFER
1.L. F. Johnson, J. E. Geusic, and L. G. Van Uitert, Appl. Phys. Letters 7, 127 (1965).
2.Energy transfer from to ions has been observed previously in glass [H. W. Gandy, R. J. Ginther, and J. F. Weller, Appl. Phys. Letters 6, 237 (1965)].
3.See, for example, E. Fick and G. Joos, Handbuch der Physik, Vol. 28, Springer‐Verlag, Berlin, 1957, p. 232.
4.J. A. Koningstein and J. E. Geusic, Phys. Rev. 136, A711 (1964);
4.J. A. Koningstein, Phys. Rev. 136, A717 (1964).
5.A line at 2.0917 μ previously reported in other crystals (ref. 1), originates from a higher‐lying component of
6.At 30‐W input, the tungsten lamp has a radiance corresponding to a black‐body temperature of 1200 °K and a color temperature of 1450 °K.
7.It was verified that the 1‐in. length of the lamp in excess of the length of the rod was not effective in exciting the crystal by observing that the threshold in a 2‐in. cylindrical ellipse was identical to that in a 1 1/4‐in. ellipse. In the latter case, a 1‐in. length of the lamp was completely out of the ellipse housing.
8.L. F. Johnson, J. P. Remeika, and J. F. Dillon, Jr., (submitted to Phys. Letters).
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