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Journal of Magnetism and Magnetic Materials

Anomalous behavior of the magneto-circular photoluminescence lineshape of R1-line in ruby (Al2O3:Cr)

Katsuaki Sato, Masakazu Hirai

Published Feb 1, 1992• 1 citation
Publisher
DOI
10.1016/0304-8853(92)90434-p

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Optics Letters•Apr 28, 2017•5 citations
Self-induced transparency is reported for circularly polarized light in the R1(−3/2) line of a 30 ppm ruby (α-Al2O3:Cr3+) at 1.7 K in a magnetic field of B‖c=4.5 T. In such a field and temperature, a 30 ppm ruby is in the so-called superhyperfine limit resulting in a long phase memory time, TM=50 μs, and a thousand-fold slower pulse propagation velocity of ∼300 m/s was observed, compared to the ∼300 km/s measured in the first observation of self-induced transparency (SIT) ∼50 years ago, that employed a ruby with a 500 ppm chromium concentration in zero field and at 4.2 K. To date, this is the slowest pulse propagation ever observed in a SIT experiment.