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[en] The essential qualities required of a production isotope separator are high output and high enrichment factor. For this purpose, the imaging system should have as little geometric aberration as possible. In the proposed system, consisting of a homogeneous sector-type analyzing magnet, the beam is crossed in the axial direction at the entrance boundary of the magnetic field and the incidence to this boundary is normal. It is shown that for this case all radial aberrations to the ''practical'' third order can be eliminated provided four optical conditions are satisfied: two related to heterogeneous aberration terms in addition to the two conditions related to the second and third order homogeneous aperture aberration terms. The resulting equations take into account the magnetic fringe-field effects to the third order. (author)
[en] A new magneto-optic unidirectional mode converter is described which does not require the use of any birefringent material. The phase matching of TE and TM modes is obtained by depositing on the garnet wave-guide a SiO2 spacer of appropriate thickness, and then a gold layer. The length of the device is made short by means of what we call ''distributed gyrotropy''
[fr]On decrit un nouveau convertisseur unidirectionnel de modes utilisant des proprietes magneto-optiques et ne faisant appel a aucun materiau birefringent. La degenerescence des phases des modes TE et TM s'obtient par deposition sur le grenat du guide d'onde d'une couche de SiO2 d'epaisseur adequate et ensuite d'une couche d'or. On obtient un dispositif court grace a ce qu'on appelle une gyrotropie distribuee
[en] The noise (fluctuation)-induced transitions between two states have fundamental importance in many physical systems. The quantitative understanding about the bistable systems was the Kramer's equation on the escape rate from a potential well. Theoretical and some experimental studies were extended to comprehend transitions between driven bistable systems that are not static potentials but oscillating ones periodically. Two atomic clouds that oscillate oppositely visualized the dynamic double wells. Different from previous experiments, since there are many particles in ours, the transitions were observed directly as exponential decay and growth of each state after removing population in one of two states. The noise (fluctuations), the main reasons of 5 transitions, are the spontaneous emissions for our atomic systems, which could be controlled the intensity and detuning of the laser going perpendicularly to the limit cycle motion. We have studied the transition rates according to the amount of diffusions from spontaneous emissions, the modulation frequency and the modulation amplitude.