Magnetic state selection impact on double resonance effect in H-maser

Abstract

Double resonance effect in a hydrogen maser appears in a two-photon process in which the Zeeman sublevels of the hydrogen atom ground state hyperfine structure are involved when applying transverse magnetic field near the Zeeman frequency. As a consequence of this process maser power falling due to weakening of the dipole coupling |F=1, mF=0>↔|F=0, mF=0> and maser shift due to amplification of the dipole couplings |F=1, mF=1>↔|F=0, mF=0> and |F=1, mF=-1>↔ |F=0, mF=0> occur near the Zeeman frequency, what has confirmed experimentally. The first analytic calculation of the effect was performed by Andresen using bare atom basis, then Humphrey confirmed this calculation by numerically solving dressed basis Bloch equations. But both calculations were realized for perfect magnet ensured state selection N1, 1= N1, 0= 1/2 and N1, -1= N0, 0= 0 that is not feasible in practice. In this paper new modified Bloch equations intended for arbitrary state selection system have been obtained and calculated. As a result an analysis of state selection performance impact on double resonance in H-maser is produced.