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Updated: Jul 4, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
Published on: December 18, 2015
Observation of noise-triggered chaotic emissions in an NMR-maser
Denis J-Y Marion1, Gaspard Huber, Patrick Berthault
1Laboratoire de Structure et Dynamique par Résonance Magnétique, URA CEA/CNRS 331, Service de Chimie Moléculaire, CEA/Saclay, 91191 Gif-sur-Yvette, France.
Abstract:
We report a new phenomenon observed when the magnetization of dissolved hyperpolarized (129)Xe is intense and opposite to the Boltzmann magnetization. Without radio-frequency (rf) excitation, the system spontaneously emits a series of rf bursts characterized by very narrow bandwidths (0.03 Hz at 138 MHz). This chaotic NMR-maser illustrates the increase in the complexity of spin dynamics at high magnetization levels by unveiling an inhomogeneous spatial organization of the xenon magnetization and an apparent dependence of the xenon transverse relaxation time on its polarization and/or on time.
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