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Electronic mechanism for refractive-index changes in intensively pumped Yb:YAG laser crystals

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Abstract

Refractive-index changes accompanying changes in population of electronic levels of Yb3+ ions in a Yb:YAG laser disk under intense diode and laser pumping have been studied by use of both a highly sensitive polarization interferometer and transient grating testing at 633nm. The electronic change of the index that is due to excitation of the Yb3+ ions (which have different polarizability of ground state F722 and excited level F522) is strongly predominant over the thermal component. The polarizability differences are Δp(1.9±0.8)×1026 and (1.95±0.25)×1026cm3 as measured at 633nm in interferometric and transient grating experiments, respectively.

© 2006 Optical Society of America

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