Abstract
Spin noise spectroscopy is a method of magnetic resonance widely used, nowadays, in atomic and semiconductor research. Classical objects of the EPR spectroscopy - dielectrics with paramagnetic impurities - seemed to be unsuitable for this technique because of large widths of allowed optical transitions and, therefore, low specific Faraday rotation (FR). We show, however, that the FR noise detected at the wavelength of a weak optical transition (with low regular FR) may increase by many orders of magnitude as its homogeneous width decreases. This spin-noise gain effect, numerically described by the ratio of the inhomogeneous linewidth to homogeneous, relates primarily to forbidden intraconfigurational transitions of impurity ions with unfilled inner electronic shells. Specifically, for the f-f transitions of rare-earth ions in crystals, this factor may reach 10$^8$. In this paper, we report on the first successful application of spin noise spectroscopy for detecting magnetic resonance of rare-earth ions in crystals.
Highlights
The spectroscopy of magnetic resonance can be applied to virtually all quantum objects possessing angular momentum and, is one of the key techniques of contemporary physics research
We apply spin-noise spectroscopy to the classical objects of electron paramagnetic resonance spectroscopy— dielectrics with paramagnetic impurities—which seemed to be unsuitable for this technique because of their low specific Faraday rotation (FR) associated with strong optical transitions
We describe the specific features of the experimental equipment required for the realization of this kind of measurements, present results of successful experiments of spin-noise spectroscopy on rare-earth ions in crystals, and briefly discuss the prospect of applying this method of magnetic resonance spectroscopy in present-day research
Summary
The spectroscopy of magnetic resonance can be applied to virtually all quantum objects possessing angular momentum and, is one of the key techniques of contemporary physics research. SNS has nowadays turned into an important method of research in atomic and semiconductor physics [16,17,18,19] It should be noticed, that this method has so far not been applied to dielectrics with paramagnetic impurities— systems which served as the primary material basis for electron resonance (EPR) spectroscopy and are nowadays widely used in state-of-the-art optics and photonics [20,21,22,23]. That this method has so far not been applied to dielectrics with paramagnetic impurities— systems which served as the primary material basis for electron resonance (EPR) spectroscopy and are nowadays widely used in state-of-the-art optics and photonics [20,21,22,23] These objects so far did not look promising for the application of SNS because of their low efficiency of conversion of “magnetization–FR.”. It is useful to remind one here that the impurities in dielectric materials that are most important for science and applications (such as Cr3+ and Nd3+ in laser media, or the RE ions in up-converters or quantum counters, in quantum memory schemes, etc.) are usually ions of the transition-metal
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