UDC 621.373This paper is devoted to the polarization dynamics of a longitudinally monomode bipolarized Nd:YAG laser: the low-frequency polarization dynamics of a microchip laser is studied experimentally and theoretically. The intensities and the relaxation oscillation spectrum of orthogonally polarized modes versus the direction of pump polarization is observed. A phase-sensitive model of a longitudinally monomode bipolarized solid-state laser with linear polarized diode laser pump is developed to account for the experimental observations.

High-frequency measurements of plasma parameters used in circuit model simulation were carried out to analyze charging damage. The bulk plasma impedance was measured by varying the bias voltage of probes with an impedance analyzer. The sheath condenser and the sheath diode characteristics were derived by fitting parameters in such a way that current-voltage (I-V) Lissajous' waveforms in the simulation agree with those in the measurement obtained using one spherical probe. The accuracy of the circuit model simulation improved by introducing the correction coefficients of the plasma parameters, which were derived by comparison between the calculated value and the measured one. Therefore, the circuit model simulation results agreed closely with the experimental results obtained using a charging damage measurement electrode. Both methods are effective for investigating the reduction of charging damage, in particular, of the etcher used for 12 inch wafers.

PACS. 75.50Rr -Magnetism in interface structures (including layer and superlattice structures). PACS. 75.30Et -Exchange and superexchange interactions. PACS. 75.70Fr -Magnetic ordering in multilayers.Abstract. -The interlayer magnetic coupling between ferromagnetic layers separated by a non-magnetic spacer layer is investigated with emphasis on the role of the non-magnetic overlayer. By using a recently proposed theory of interlayer coupling, which expresses the coupling in terms of quantum interferences due to electron confinement, it is predicted that the coupling oscillates vs. overlayer thickness, with a period related to the Fermi surface of the latter. This prediction has been confirmed experimentally on Au/Co/Au/Co/Au(111) films, with an oscillation period vs. Au overlayer thickness of 5 atomic layers, in good agreement with the predicted value (4.8 atomic layers).

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Orthogonally polarized modes have been operated in a Nd:YAG laser with weakly amsotropic cavity. Different intensity dependences of the orthogonal modes on the orientation of the pump polarization plane are discovered. The power spectrum of each polarization mode reveals three relaxation peaks in a good agreement with predictions of the laser model modified to include polarization effects.