期刊
CHEMICAL PHYSICS LETTERS
卷 325, 期 1-3, 页码 257-263出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0009-2614(00)00652-7
关键词
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The up-conversion processes due to the continuous wave excitation of the holmium I-5(4) multiplet in LiYF4 crystal are investigated. Despite a very low absorption cross-section for the transition from the holmium I-5(8) ground state to the I-5(4) multiplet, a bright green up-converted emission originating from the S-5(2) multiplet is observed. The excitation and excited state absorption spectra indicate that the up-conversion process is based mainly on excited state absorption from the metastable I-5(7) multiplet, Some features of the up-converted green emission are characteristic for the photon avalanche process. (C) 2000 Published by Elsevier Science B.V.
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