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Chemical Physics Letters

Temperature dependence of the R1 linewidth in Al2O3:Mn4+: A spectral hole-burning and FLN study

Hans Riesen, Thomas Monks-Corrigan, Neil B. Manson

Published Sep 17, 2011• 10 citations
Publisher
DOI
10.1016/j.cplett.2011.09.039

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We report transient spectral hole-burning experiments conducted in the R1(±1/2) line of 53-chromium(III) doped Al2O3 in zero field and low magnetic fields B∥c at 3 K. These facile experiments enable, in principle, the simultaneous determination of the hyperfine coupling parameters for both the 4A2 ground state and the Ē(E2) excited state, and in both directions to the crystal caxis. In order to determine these parameters we have applied a global fit by simulated spectra to the experimental data and good agreement between calculated and measured hole-burning patterns is achieved. The relevant resulting parameters for the Ē(E2) excited state are A∥=18±4 MHz and A⊥=40±4 MHz.
We report on the observation of slow light induced by transient spectral hole-burning in a solid, that is based on excited-state population storage. Experiments were conducted in the R1-line (2E←4A2 transition) of a 2.3 mm thick pink ruby (Al2O3:Cr(III) 130 ppm). Importantly, the pulse delay can be controlled by the application of a low external magnetic field B||c≤9 mT and delays of up to 11 ns with minimal pulse distortion are observed for ~55 ns Gaussian pulses. The delay corresponds to a group velocity value of ~c/1400. The experiment is very well modelled by linear spectral filter theory and the results indicate the possibility of using transient hole-burning based slow light experiments as a spectroscopic technique.