Dussardier, B., Wang, J., Hanna, D.C. and Payne, D.N.
Spectroscopy and CW 2-photon upconversion in Tm3+-doped ZnCl2-based glass
Optical Materials, 4, (5), . (doi:10.1016/0925-3467(95)00008-9).
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In this paper, the preparation, spectroscopic characterization and optical up-conversion properties of Tm3+-doped ZnCl2 based glass are presented. The particular arrangement of the Tm3+ energy levels, combined with the low phonon energy of the glass, yields two continuous two-photon up-conversion processes from infrared light (795 nm) to blue (483 nm) and red (653 nm and 664 nm) light, and from red (707 nm) to ultraviolet (378 nm) light, respectively.
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