Abstract
In read-write magnetooptic storage applications, the external feedback from the optical disk is ~5%, and the GaAlAs diode lasers used typically have low facet reflectivities of 3-10% to reduce facet-damage problems. The resulting strong interaction between the internal and external laser fields leads to severe amplitude noise. We found that these instabilities consist of random power dropouts similar to those observed in previous experiments.1 Apparently, the laser seeks to reduce its threshold through a phase alignment between the external and internal laser fields, but, in the regime of moderate feedback,2 this coherent alignment is unstable and substantial power fluctuations occur.
© 1990 Optical Society of America
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