Physical review. B, Condensed matter

Optical dephasing by nonequilibrium phonons in LaF3

Richard S. Meltzer, R. M. Macfarlane

Published Jul 15, 1985• 17 citations

Abstract

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.

DOI: 10.1103/physrevb.32.1248

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OPTICAL DEPHASING OF Pr3+ IONS BY NONEQUILIBRIUM PHONONS IN LaF3 AND YAlO3

R. M. Macfarlane, Richard S. Meltzer

We describe a new effect, phonon-induced coherence loss (PICOLO), whereby a monoenergetic nonequilibrium phonon distribution is responsible for the loss of optical coherence. The interaction of these phonons with the ions is monitored with the free induction decay or photon echo. We show how PICOLO can be used to study the electron-phonon interaction and the dynamics of phonons.

Le Journal de Physique ColloquesOct 1, 19851 citation

Dynamics of monochromatically generated nonequilibrium phonons in LaF3 : Pr3+

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

Physical Review LettersJul 30, 199031 citations

Dynamics of monochromatic nonequilibrium phonons generated by defect-induced one-phonon absorption

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

Annual Meeting Optical Society of AmericaJan 1, 19900 citations

Coherent Phonon Generation and High Frequency Phonon Spectroscopy.

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Mar 18, 19860 citations

Phonon-induced optical dephasing in alexandrite by thermal and nonequilibrium phonons

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We report on the phonon-induced optical dephasing processes in the 2E-excited states of Cr3+ in BeAl2O4 (alexandrite). We obtain measurements In the presence of (1) a thermal distribution of phonons in equilibrium conditions and (2) a spectrally narrow distribution of resonant phonons in highly nonequilibrium conditions.

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Nonequilibrium resonant-phonon-induced excess photon-echo dephasing

Yue Bai, Ravinder Kachru

Physical review. B, Condensed matterDec 1, 199212 citations

Physical review. B, Condensed matter

Optical dephasing by nonequilibrium phonons in LaF3

Richard S. Meltzer, R. M. Macfarlane

Published Jul 15, 1985• 17 citations

Publisher

Abstract

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.

DOI: 10.1103/physrevb.32.1248

Related papers

OPTICAL DEPHASING OF Pr3+ IONS BY NONEQUILIBRIUM PHONONS IN LaF3 AND YAlO3

R. M. Macfarlane, Richard S. Meltzer

Le Journal de Physique ColloquesOct 1, 19851 citation

Dynamics of monochromatically generated nonequilibrium phonons in LaF3 : Pr3+

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

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.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.

Physical Review LettersJul 30, 199031 citations

Dynamics of monochromatic nonequilibrium phonons generated by defect-induced one-phonon absorption

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

Defect-induced one-phonon absorption1 of far-infrared radiation is used to generate monochromatic nonequilibrium phonon populations in LaF3:Pr3+ at a range of frequencies throughout the acoustic band. The pump source for this generation mechanism is a transversely excited atmospheric-pressure CO2-laser-pumped superradiant cell. Phonon occupation numbers of order 10 are generated. Phonons are optically detected in a time-resolved frequency-selective manner by using the anti-Stokes absorption sideband of the 3P0 state of Pr3+. The lifetime of these phonons is determined and is found to obey the ω-5 dependence as predicted by the isotropic dispersionless model for anharmonic decay of acoustic phonons.2 The spectral dynamics associated with the decay of these phonons is also investigated and is compared with a rate-equation analysis that includes backfeeding of the decay products. The production of double-frequency phonons by a three-phonon confluence process is also demonstrated.Defect-induced one-phonon absorption1 of far-infrared radiation is used to generate monochromatic nonequilibrium phonon populations in LaF3:Pr3+ at a range of frequencies throughout the acoustic band. The pump source for this generation mechanism is a transversely excited atmospheric-pressure CO2-laser-pumped superradiant cell. Phonon occupation numbers of order 10 are generated. Phonons are optically detected in a time-resolved frequency-selective manner by using the anti-Stokes absorption sideband of the 3P0 state of Pr3+. The lifetime of these phonons is determined and is found to obey the ω-5 dependence as predicted by the isotropic dispersionless model for anharmonic decay of acoustic phonons.2 The spectral dynamics associated with the decay of these phonons is also investigated and is compared with a rate-equation analysis that includes backfeeding of the decay products. The production of double-frequency phonons by a three-phonon confluence process is also demonstrated.

Annual Meeting Optical Society of AmericaJan 1, 19900 citations

Coherent Phonon Generation and High Frequency Phonon Spectroscopy.

John E. Rives, Richard S. Meltzer, David Paul Landau

A number of optical techniques have been developed in recent years which have been applied to study the dynamics of high frequency phonons. Monoenergetic phonons were generated by spin-lattice relaxation between two electronically excited states of an impurity ion. Resonant trapping provided the means to detect these phonons with good temporal resolution. VSPS was used to detect high frequency phonons over a wide frequency range with excellent temporal, spectral and spatial resolution. The life-time of a monoenergetic non-equilibrium distribution of phonons was determined by the observation of optical dephasing, using free induction decay(FID), which results from phonon induced coherence loss(PICOLO). Non-resonant fluorescence line narrowing(FLN) techniques provided a means to determine the spectral distribution of non-equilibrium phonons generated by spin lattice relaxation. Keywords: Phonons; Phonon decay; Coherent phonon generation; Phonon spectroscopy; High frequency phonons and Monoenergetic phonons.A number of optical techniques have been developed in recent years which have been applied to study the dynamics of high frequency phonons. Monoenergetic phonons were generated by spin-lattice relaxation between two electronically excited states of an impurity ion. Resonant trapping provided the means to detect these phonons with good temporal resolution. VSPS was used to detect high frequency phonons over a wide frequency range with excellent temporal, spectral and spatial resolution. The life-time of a monoenergetic non-equilibrium distribution of phonons was determined by the observation of optical dephasing, using free induction decay(FID), which results from phonon induced coherence loss(PICOLO). Non-resonant fluorescence line narrowing(FLN) techniques provided a means to determine the spectral distribution of non-equilibrium phonons generated by spin lattice relaxation. Keywords: Phonons; Phonon decay; Coherent phonon generation; Phonon spectroscopy; High frequency phonons and Monoenergetic phonons.

Mar 18, 19860 citations

Phonon-induced optical dephasing in alexandrite by thermal and nonequilibrium phonons

D.M. Boye, Sara A. Majetich, John E. Rives +2 more

Journal of the Optical Society of America BJan 1, 19870 citations

Nonequilibrium resonant-phonon-induced excess photon-echo dephasing

Yue Bai, Ravinder Kachru

We demonstrate that the excitation-induced excess dephasing of photon echoes in ${\mathrm{Pr}}^{3+}$ : ${\mathrm{YA}1\mathrm{O}}_{3}$ ${(}^{3}$ ${\mathrm{H}}_{4}$ ${\mathrm{\ensuremath{-}}}^{1}$ ${\mathrm{D}}_{2}$ ) is predominantly induced by the 51-${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ resonant phonons associated with nonradiative relaxations of the excited ions. Instantaneous diffusion via direct ion-ion coupling is found to be much less important. The dephasing mechanism discussed should be applicable to all other systems where the relaxation of excited states involves nonradiative processes.We demonstrate that the excitation-induced excess dephasing of photon echoes in ${\mathrm{Pr}}^{3+}$:${\mathrm{YA}1\mathrm{O}}_{3}$${(}^{3}$${\mathrm{H}}_{4}$${\mathrm{\ensuremath{-}}}^{1}$${\mathrm{D}}_{2}$) is predominantly induced by the 51-${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ resonant phonons associated with nonradiative relaxations of the excited ions. Instantaneous diffusion via direct ion-ion coupling is found to be much less important. The dephasing mechanism discussed should be applicable to all other systems where the relaxation of excited states involves nonradiative processes.

Physical review. B, Condensed matterDec 1, 199212 citations

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+}

{\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}

phonons produced thermally.

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.

We demonstrate that the excitation-induced excess dephasing of photon echoes in

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

{\mathrm{YA}1\mathrm{O}}_{3}

{(}^{3}

{\mathrm{H}}_{4}

${\mathrm{\ensuremath{-}}}^{1}$

{\mathrm{D}}_{2}

) is predominantly induced by the 51-${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ resonant phonons associated with nonradiative relaxations of the excited ions. Instantaneous diffusion via direct ion-ion coupling is found to be much less important. The dephasing mechanism discussed should be applicable to all other systems where the relaxation of excited states involves nonradiative processes.