Picosecond photon-echo spectroscopy in ordered and disordered fluoride crystals doped with Nd3+ ions

Keith W. Ver Steeg, Roger J. Reeves, Vladimir Fedorov, Alexander Ya. Karasik, Tasoltan T. Basiev, Richard C. Powell

Published May 8, 1994• 0 citations

Abstract

It is important to compare dephasing mechanisms for ordered and disordered systems with a small and large inhomogeneous line broadening, respectively. We studied dephasing processes in crystals with Nd3+ ions by using the accumulated photon echo (APE) technique. Ordered (CaF2) and disordered (CaF2–YF3) crystals were chosen for investigations.

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Published May 8, 1994• 0 citations

OpenAlex

Abstract

Related papers

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Numerous experimental investigations of homogeneous line broadening (Γh) of RE3+ ions in crystals and glasses in frequency and time domain [1] have shown that Γh for glasses exceed those for crystals by more than one order of magnitude at low temperatures (T) for the same ions and transitions. Discrepancies between theory and experimental results make it difficult to determine an influence of host disordering on the Γh in a wide temperature range. In this work we measured and compared Γh, values for ordered CaF2 and disordered CaF2-YF3 crystals doped with Nd3+ ions.Numerous experimental investigations of homogeneous line broadening (Γh) of RE3+ ions in crystals and glasses in frequency and time domain [1] have shown that Γh for glasses exceed those for crystals by more than one order of magnitude at low temperatures (T) for the same ions and transitions. Discrepancies between theory and experimental results make it difficult to determine an influence of host disordering on the Γh in a wide temperature range. In this work we measured and compared Γh, values for ordered CaF2 and disordered CaF2-YF3 crystals doped with Nd3+ ions.

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Journal of LuminescenceMay 1, 199522 citations

Accumulated photon echoes were used to measure the dephasing time (

{\mathit{T}}_{2}

) of the

^{4}

{\mathit{I}}_{9/2}

${\ensuremath{\rightarrow}}^{4}$

{\mathit{G}}_{5/2}

{,}^{2}

{\mathit{G}}_{7/2}

transition of

{\mathrm{Nd}}^{3+}

in highly disordered

{\mathrm{CaF}}_{2}

{\mathrm{YF}}_{3}

crystals.

{\mathit{T}}_{2}

decreased from subnanosecond values for excitation of low-lying Stark levels to subpicosecond values for excitation of high-lying levels. From 9--100 K the measured temperature dependence of the homogeneous linewidth is described by a resonant single-phonon absorption process.