Abstract

${}^4\mathrm{He} 2{ }^3{S}_1\to 2 {}^{3}P$ transitions at 1083 nm were laser probed in the presence of radiation that coupled the $2 {}^{3}P$ level with the $3{ }^3{S}_1$ level in a ladder scheme. The metastable helium that was used was produced in a rf discharge. Significant atomic birefringence was detected, in addition to complete electromagnetically induced transparency. A simple theoretical model explains the experimental results.

© 1997 Optical Society of America

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