Abstract

We report nuclear quadrupole resonance (NQR) frequency and linewidth variations of the Pr³⁺ ground-state hyperfine levels for various positions within the ³H₄(Γ1)–¹D₂(Γ1) inhomogeneous optical line and satellite transitions of Pr³⁺:LaF₃. A linear increase in the broadening of the Pr³⁺ hyperfine transitions, without a shift of central frequency, is measured by the Stark modulated optical pumping hole-burning technique as the laser is tuned toward the wings of the inhomogeneous optical transition. The linear variation is attributed to electric quadrupole broadening caused by changes in the local density of point defects across the Stark-broadened optical transition. The optically detected NQR spectra of the satellite transitions associated with Pr ion pairs are shifted in frequency and for most satellites are narrower than the NQR spectra found in the wings of the main inhomogeneous optical line.

© 1992 Optical Society of America

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