Abstract
We have demonstrated the first two species maser. Ensembles of ${}^{3}\mathrm{He}$ and ${}^{129}\mathrm{Xe}$ gas, co-located in a double-chamber glass cell, performed simultaneous maser oscillations on their nuclear spin- $\frac{1}{2}$ Zeeman transitions. This new device may be used for experiments requiring precision magnetometry combined with frequency measurement of a second free-running species operating in the same volume. For example, the ${}^{3}\mathrm{He}$ maser may serve as a magnetometer, while the ${}^{129}\mathrm{Xe}$ maser may be used to search for a permanent electric dipole moment of the ${}^{129}\mathrm{Xe}$ atom as a test of time reversal symmetry.
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