Physics – Quantum Physics
Scientific paper
2008-08-26
Phys. Rev. A 78, 043402 (2008)
Physics
Quantum Physics
9 pages, 9 figures, submitted to Phys. Rev. A
Scientific paper
10.1103/PhysRevA.78.043402
Erbium doped solids are potential candidates for the realization of a quantum memory for photons at telecommunication wavelengths. The implementation of quantum memory proposals in rare earth ion doped solids require spectral tailoring of the inhomogeneous absorption profile by efficient population transfer between ground state levels (spin polarization) using optical pumping. In this article we investigate the limiting factors of efficient optical pumping between ground state Zeeman levels in an erbium doped Y2SiO5 crystal. We introduce two methods to overcome these limiting factors: stimulated emission using a second laser and spin mixing using radio frequency excitation. Both methods significantly improve the degree of spin polarization. Population transfer between two Zeeman levels with less than 10 % of the total population in the initial ground state is achieved, corresponding to a spin polarization greater than 90 %. In addition, we demonstrate spectral tailoring by isolating a narrow absorption peak within a large transparency window.
Afzelius Mikael
Gisin Nicolas
Hastings-Simon Sara R.
Lauritzen Björn
Riedmatten Hugues de
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