Abstract
A recent comparison of Yb, Ho upconversion energy transfer in different fluoride crystals has been performed[1]. The purpose was to demonstrate the promise of Yb,Ho:KYF4 as a green upconversion laser as compared with similarly doped BaY2F8 (BYF) and YLiF4 (YLF). We compare here high resolution, low temperature absorption spectra for the three crystals and our determination of the energy levels.
© 1993 Optical Society of America
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