Side-hole to anti-hole conversion in time-resolved spectral hole burning of ruby: Long-lived spectral holes due to ground state level population storage |
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Authors: | Hans Riesen Brendan F Hayward |
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Institution: | a School of Physical, Environmental and Mathematical Sciences, The University of New South Wales, ADFA, Northcott Drive, Canberra, ACT 2600, Australia b Institute for Microstructural Sciences, National Research Council of Canada, 1200 Montreal Road, Ottawa, Ont., Canada K1A 0R6 |
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Abstract: | We report time-resolved transient spectral hole burning of Verneuil-grown 20 ppm and ca. 0.6 ppm ruby (Al2O3:Cr3+) in zero field and low magnetic fields B∥c at 4 K. The hole-burning spectroscopy of the 20 ppm sample implies relatively rapid cross relaxation in the 4A2 ground state on the ∼1 ms timescale both in zero field and in low magnetic fields, B∥c, up to 0.2 T. In the 0.6 ppm sample, side-hole to anti-hole conversion is observed both in zero field and in low magnetic fields. This conversion is caused by population storage in 4A2 ground state levels. Spin-lattice relaxation, on the 200 ms timescale, is directly observed from the time dependence of the resonant hole and anti holes in B∥c, consistent with a very low cross-relaxation rate. However, in zero field cross relaxation in the 4A2 ground state is still a significant relaxation mechanism for the 0.6 ppm sample resulting in hole decay in ∼50 ms. |
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Keywords: | Ruby Transient hole burning Time resolved Cross relaxation Spin-lattice relaxation Zeeman effect Anti holes Side holes Ground-state population storage |
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