Physical Review Letters

Dynamics of monochromatically generated nonequilibrium phonons in LaF3 : Pr3+

W. A. Tolbert, William M. Dennis, William M. Yen

Published Jul 30, 1990• 31 citations

Abstract

The temporal evolution of nonequilibrium phonon populations in ${\mathrm{LaF}}_{3}$:${\mathrm{Pr}}^{3+}$ is investigated at low temperatures (1.8 K) utilizing pulsed, tunable, monochromatic generation and time-resolved, tunable, narrow-band detection. High occupation number, narrow-band phonon populations are generated via far-infrared pumping of defect-induced one-phonon absorption. Time-resolved, frequency-selective detection is provided by optical sideband absorption. Nonequilibrium phonon decay times are measured and attributed to anharmonic decay.

DOI: 10.1103/physrevlett.65.607

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Spectral and temporal dynamics of nonequilibrium phonons in LaF3 : Pr3+

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Physical Review Letters

Dynamics of monochromatically generated nonequilibrium phonons in LaF3 : Pr3+

W. A. Tolbert, William M. Dennis, William M. Yen

Published Jul 30, 1990• 31 citations

Publisher

Abstract

The temporal evolution of nonequilibrium phonon populations in

{\mathrm{LaF}}_{3}

{\mathrm{Pr}}^{3+}

is investigated at low temperatures (1.8 K) utilizing pulsed, tunable, monochromatic generation and time-resolved, tunable, narrow-band detection. High occupation number, narrow-band phonon populations are generated via far-infrared pumping of defect-induced one-phonon absorption. Time-resolved, frequency-selective detection is provided by optical sideband absorption. Nonequilibrium phonon decay times are measured and attributed to anharmonic decay.

DOI: 10.1103/physrevlett.65.607

Related papers

Spectral and temporal dynamics of nonequilibrium phonons in LaF3 : Pr3+

W. A. Tolbert, William M. Dennis, William M. Yen

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We have investigated the spectral and temporal dynamics associated with the interaction between monochromatic and thermal phonon distributions in YAG: ${\mathrm{Pr}}^{3+}$ . Using defect-induced one-phonon absorption to generate a monochromatic phonon distribution at 43.3 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$, we measure a ${\mathit{T}}^{\mathrm{\ensuremath{-}}3}$ dependence of the monochromatic phonon lifetime in the temperature range 9 to 25 K. We observe the evolution of additional broadband phonon distributions which do not occur at low temperatures.We have investigated the spectral and temporal dynamics associated with the interaction between monochromatic and thermal phonon distributions in YAG:${\mathrm{Pr}}^{3+}$. Using defect-induced one-phonon absorption to generate a monochromatic phonon distribution at 43.3 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$, we measure a ${\mathit{T}}^{\mathrm{\ensuremath{-}}3}$ dependence of the monochromatic phonon lifetime in the temperature range 9 to 25 K. We observe the evolution of additional broadband phonon distributions which do not occur at low temperatures.

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Investigations of far infrared generated nonequilibrium phonons in LaF3:Pr3+

W. A. Tolbert, William M. Dennis, Richard S. Meltzer +1 more

Journal of LuminescenceJan 1, 19902 citations

The temporal evolution of nonequilibrium phonon populations in

{\mathrm{LaF}}_{3}

{\mathrm{Pr}}^{3+}

Defect-induced one-phonon absorption is used to generate high-occupation-number narrow-band nonequilibrium phonon populations at a range of frequencies in

{\mathrm{LaF}}_{3}

{\mathrm{Pr}}^{3+}

. The spectral and temporal dynamics associated with the return to equilibrium of these phonons is observed. Processes that dominate the spectral evolution are shown to be narrow-band phonon confluence, anharmonic decay, and the broadband confluence of anharmonic decay products. The experimental data are shown to be in good agreement with a phonon-occupation-number rate-equation analysis that incudes the above processes.

Phonon-induced coherence loss (PICL) is produced by a monoenergetic nonequilibrium distribution of phonons in

{\mathrm{LaF}}_{3}

{\mathrm{Pr}}^{3+}

. The phonons are generated by relaxation between excited states of the

{\mathrm{Pr}}^{3+}

ion after selective excitation with a pulsed, tunable dye laser. The optical dephasing is observed from the effect on the free-induction decay of

{\mathrm{Pr}}^{3+}

ions whose excited-state level separation is resonant with the phonons. It is shown that PICL is a sensitive detector of monoenergetic phonons, and can be used to study phonon dynamics. The observed rate of optical dephasing is reduced relative to an equivalent occupation of 23-${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ phonons produced thermally.

We have investigated the spectral and temporal dynamics associated with the interaction between monochromatic and thermal phonon distributions in YAG:

{\mathrm{Pr}}^{3+}

. Using defect-induced one-phonon absorption to generate a monochromatic phonon distribution at 43.3 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$, we measure a ${\mathit{T}}^{\mathrm{\ensuremath{-}}3}$ dependence of the monochromatic phonon lifetime in the temperature range 9 to 25 K. We observe the evolution of additional broadband phonon distributions which do not occur at low temperatures.