International Conference on Luminescence - 1984

Low Temperature Optical Dephasing of Rare Earth Ions by Tunneling Systems in Glass

Matthijs M. Broer

Published Jan 1, 1984• 1 citation

Abstract

Optical dephasing of paramagnetic ions and molecules in organic and inorganic amorphous solids at low temperatures (≲100K) is characterized by unusual temperature dependences and enhanced relaxation rates compared to crystalline systems1. For a large variety of impurity-host combinations the dephasing rate has been found to follow a Tm temperature dependence with m approximately 2. Several theories have attempted to explain this behavior by assuming interactions between the optical center, phonons, and atomic tunneling systems. However, the role of the intrinsic disorder in optical dephasing in these systems is not clearly understood.

DOI: 10.1364/icol.1984.wf1

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International Conference on Luminescence - 1984

Low Temperature Optical Dephasing of Rare Earth Ions by Tunneling Systems in Glass

Matthijs M. Broer

Published Jan 1, 1984• 1 citation

Publisher

Abstract

DOI: 10.1364/icol.1984.wf1

Related papers

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Physical review. B./Physical review. BNov 1, 201630 citations

A theoretical description of the temperature-dependent dephasing rate of rare-earth ions in glass is given for temperatures

T<1

K. The model invokes elastic dipole-dipole interactions between the rare-earth ions and atomic tunneling systems. The calculation explains features of a recent photon-echo experiment on Si

{\mathrm{O}}_{2}

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

, namely, the magnitude and

{T}^{1.3}

dependence of the dephasing rate.

A detailed description is presented of photon echo experiments in

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

-doped silica optical fibers at temperatures below 1 K. Dephasing rates ${T}_{2}^{\mathrm{\ensuremath{-}}1}$ have been obtained from two-pulse echo sequences at 0.89 \ensuremath{\mu}m and are found to follow a

{T}^{1.3}

temperature dependence. An interpretation of this result is presented which invokes the interaction of tunneling systems with the optical ions via a dipole-dipole elastic interaction. The dynamics of the interaction originates in a spectral diffusion process and three pulse stimulated echo experiments confirm this interpretation.

{\mathrm{Eu}}^{3+}

dopants in a series of

{\mathrm{Y}}_{2}{\mathrm{O}}_{3}

ceramic samples prepared under varying conditions. We characterize the temperature and magnetic field dependence of the homogeneous linewidth, as well as long-term spectral diffusion on time scales up to 1 s. The results highlight significant differences between samples with differing thermal treatments and

{\mathrm{Zr}}^{4+}

additive concentrations. In particular, several distinct magnetic interactions from defect centers are observed, which are clearly distinguished from the broadening due to interactions with two-level systems and phonons. By minimizing the broadening due to the different defect centers, linewidths of the order of 4 kHz are achieved for all samples. The linewidths are limited by temperature-dependent interactions and by an interaction that is yet to be identified. Although the homogeneous linewidth can be narrowed further in these ceramic samples, the broadening is now comparable to the linewidths achieved in rare-earth-ion--doped single crystals. Thus, this work emphasizes the usefulness of studying ceramics to gain insights into dephasing mechanisms relevant to single crystals and suggests that ceramics may be an interesting alternative for applications in classical and quantum information processing.