Abstract
Refractive-index changes accompanying changes in population of electronic levels of 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 . The electronic change of the index that is due to excitation of the ions (which have different polarizability of ground state and excited level ) is strongly predominant over the thermal component. The polarizability differences are and as measured at in interferometric and transient grating experiments, respectively.
© 2006 Optical Society of America
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