Abstract
Significant progress in the development of solid-state lasers based on the Ho3+ ion has been made within the last few years. A particularly useful system is Υ3Αl5O12:Ηο3+ codoped with the Cr3+ and Tm3+ dopants, which allow for the efficient sensitization of the Ho laser ions in a flashlamp-pumped laser design.1 On the other hand, only the Tm sensitizers are required for AlGaAs laser diode-pumped systems (including the Y3Al5O12 and LiYF4 hosts).2,3 The crucial Tm and Ho energy transfer processes involve the so-called "two-for-one" cross relaxation of Tm, the Tm → Ho energy transfer step, and the Auger upconversion of Ho,4 (illustrated in Fig. 1). In this work we will focus on the Tm → Ho energy transfer step,3 although the new insights that are developed suggest a way to minimize the undesirable Auger upconversion.
© 1992 Optical Society of America
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