%0 Journal Article
%K Raman
%K Raman scattering
%K Raman-scattering
%K Scattering
%K Crystal
%K Resonance
%A P C Becker
%A G M Williams
%A Richard E Russo
%A Norman E Edelstein
%A J. J Arnold Koningstein
%A Lynn A Boatner
%A Marvin M Abraham
%B Optics Letters
%D 1986
%F Laser
%G eng
%N 5
%P 282-284
%R 10.1364/OL.11.000282
%T Resonance electronic Raman scattering in Erbium phosphate crystals
%V 11
%8 05/1986
%X <p>Resonance enhancement factors of 10 to 100 have been observed for the electronic Raman scattering transitions in crystals of pure ErPO<sub>4</sub> and 1% Er<sup>3+</sup> diluted in LuPO<sub>4</sub>. The resonances were excited by the 488.0-nm line of an argon-ion laser. This line is nearly coincident with the crystal-field levels of the <sup>4</sup><em>F<sub>7/2</sub></em> multiplet of Er<sup>3+</sup>. The differences in relative intensities between the transitions in ErPO<sub>4</sub> and those in 1% Er<sup>3+</sup> in LuPO<sub>4</sub> arise from shifts in the energy levels in the two systems and suggest that quantum-mechanical interference effects play an important role.</p>