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Nanosecond time-resolved characterization of a pentacene-based room-temperature MASER

The performance of a room temperature, zero-field MASER operating at 1.45 GHz has been examined. Nanosecond laser pulses, which are essentially instantaneous on the timescale of the spin dynamics, allow the visible-to-microwave conversion efficiency and temporal response of the MASER to be measured...

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Autores principales: Salvadori, Enrico, Breeze, Jonathan D., Tan, Ke-Jie, Sathian, Juna, Richards, Benjamin, Fung, Mei Wai, Wolfowicz, Gary, Oxborrow, Mark, Alford, Neil McN., Kay, Christopher W. M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5294447/
https://www.ncbi.nlm.nih.gov/pubmed/28169331
http://dx.doi.org/10.1038/srep41836
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author Salvadori, Enrico
Breeze, Jonathan D.
Tan, Ke-Jie
Sathian, Juna
Richards, Benjamin
Fung, Mei Wai
Wolfowicz, Gary
Oxborrow, Mark
Alford, Neil McN.
Kay, Christopher W. M.
author_facet Salvadori, Enrico
Breeze, Jonathan D.
Tan, Ke-Jie
Sathian, Juna
Richards, Benjamin
Fung, Mei Wai
Wolfowicz, Gary
Oxborrow, Mark
Alford, Neil McN.
Kay, Christopher W. M.
author_sort Salvadori, Enrico
collection PubMed
description The performance of a room temperature, zero-field MASER operating at 1.45 GHz has been examined. Nanosecond laser pulses, which are essentially instantaneous on the timescale of the spin dynamics, allow the visible-to-microwave conversion efficiency and temporal response of the MASER to be measured as a function of excitation energy. It is observed that the timing and amplitude of the MASER output pulse are correlated with the laser excitation energy: at higher laser energy, the microwave pulses have larger amplitude and appear after shorter delay than those recorded at lower laser energy. Seeding experiments demonstrate that the output variation may be stabilized by an external source and establish the minimum seeding power required. The dynamics of the MASER emission may be modeled by a pair of first order, non-linear differential equations, derived from the Lotka-Volterra model (Predator-Prey), where by the microwave mode of the resonator is the predator and the spin polarization in the triplet state of pentacene is the prey. Simulations allowed the Einstein coefficient of stimulated emission, the spin-lattice relaxation and the number of triplets contributing to the MASER emission to be estimated. These are essential parameters for the rational improvement of a MASER based on a spin-polarized triplet molecule.
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spelling pubmed-52944472017-02-10 Nanosecond time-resolved characterization of a pentacene-based room-temperature MASER Salvadori, Enrico Breeze, Jonathan D. Tan, Ke-Jie Sathian, Juna Richards, Benjamin Fung, Mei Wai Wolfowicz, Gary Oxborrow, Mark Alford, Neil McN. Kay, Christopher W. M. Sci Rep Article The performance of a room temperature, zero-field MASER operating at 1.45 GHz has been examined. Nanosecond laser pulses, which are essentially instantaneous on the timescale of the spin dynamics, allow the visible-to-microwave conversion efficiency and temporal response of the MASER to be measured as a function of excitation energy. It is observed that the timing and amplitude of the MASER output pulse are correlated with the laser excitation energy: at higher laser energy, the microwave pulses have larger amplitude and appear after shorter delay than those recorded at lower laser energy. Seeding experiments demonstrate that the output variation may be stabilized by an external source and establish the minimum seeding power required. The dynamics of the MASER emission may be modeled by a pair of first order, non-linear differential equations, derived from the Lotka-Volterra model (Predator-Prey), where by the microwave mode of the resonator is the predator and the spin polarization in the triplet state of pentacene is the prey. Simulations allowed the Einstein coefficient of stimulated emission, the spin-lattice relaxation and the number of triplets contributing to the MASER emission to be estimated. These are essential parameters for the rational improvement of a MASER based on a spin-polarized triplet molecule. Nature Publishing Group 2017-02-07 /pmc/articles/PMC5294447/ /pubmed/28169331 http://dx.doi.org/10.1038/srep41836 Text en Copyright © 2017, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Salvadori, Enrico
Breeze, Jonathan D.
Tan, Ke-Jie
Sathian, Juna
Richards, Benjamin
Fung, Mei Wai
Wolfowicz, Gary
Oxborrow, Mark
Alford, Neil McN.
Kay, Christopher W. M.
Nanosecond time-resolved characterization of a pentacene-based room-temperature MASER
title Nanosecond time-resolved characterization of a pentacene-based room-temperature MASER
title_full Nanosecond time-resolved characterization of a pentacene-based room-temperature MASER
title_fullStr Nanosecond time-resolved characterization of a pentacene-based room-temperature MASER
title_full_unstemmed Nanosecond time-resolved characterization of a pentacene-based room-temperature MASER
title_short Nanosecond time-resolved characterization of a pentacene-based room-temperature MASER
title_sort nanosecond time-resolved characterization of a pentacene-based room-temperature maser
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5294447/
https://www.ncbi.nlm.nih.gov/pubmed/28169331
http://dx.doi.org/10.1038/srep41836
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