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Journal of the Optical Society of America B

Persistent Spectral Hole Burning in CaF 2 :Sm 2+

R. M. Macfarlane, Robert M. Shelby

Published Jan 1, 1984• 0 citations
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Summary form only given. Using persistent spectral hole burning, rare-earth ions doped in crystalline or glassy matrices may prove useful in optical data storage. In the case of Sm/sup 2+/, persistent spectral hole burning is due to photoionization: the Sm/sup 2+/ is oxidized to form Sm/sup 3+/, and the ejected electron is trapped in the matrix. For applications, it is important to understand the trapping mechanism, to identify the nature of the traps, and to see whether they are stable at room temperature.
Persistent spectral hole burning has been observed in CaF(2):Sm(2+) and originates from photoionization of the Sm(2+) ion. This represents a new class of persistent hole-burning materials. We have used hole burning to measure the nonlinear Zeeman effect of the (7)F(0)A(1g) ? A(1u) transition at 695.8 nm with a resolution of ~100 MHz. We find a nonlinear coefficient of 0.93 Hz/G(2), which is close to the value of 1.0 Hz/G(2) calculated for the (7)F(0)-(7)F(1) interaction. This shows that the dominant contribution to the nonlinear Zeeman effect comes from the ground state.