Phase Shift Mode Research Articles

Analysis of transverse modes of phase-locked multi-stripe lasers

We show that the 180° phase-shift modes are always favoured in the limit of the large stripe number when the coupling between the stripes is not weak in phase-locked multiple-stripe lasers. The 0° mode selection is possible only when the stripe number is finite.

Magnetoresistance variation and noise properties of chevron stretcher detectors

The angular variation of the magnetoresistance of one- and two-level chevron stretcher detectors has been determined and related to the underlying microscopic domain configuration. The origin of the 1ω-2ω transition (where ω is the angular frequency of the rotating field) in one-level detectors is shown to be the result of incomplete magnetization reversal along the detector. The characteristics of this transition and the associated output are discussed for 28- and 20-μm-period devices. Also discussed are the amplitude- and phase-shift modes of operation of these detectors for normal drive fields. Noise measurements made on zero- and one-state detector outputs show that both states exhibit a √N noise dependence with the number of chevrons N and that the drive-field dependence of the noise is approximately 1/Hxy at large drive fields. Comparison of the noise output from different detector geometries is made.