At&t Bell Laboratories

American Telephone & Telegraph Co., At&t Bell Laboratories

William J Tabor

Andrew H Bobeck

Richard C Sherwood

Robert Louis Hartman

Eva Milar Vogel

Lloyd R Harriott

George J Przybylek

Daniel R Kaplan

Robert Zappulla

A reflection filter is disposed on a solid state laser so as to preferentially reflect TE or TM modes and to suppress oscillation within the resonator of the non-reflected modes. In one embodiment, the filter includes a layer having a plurality of grooves which may be straight and parallel or curved to approximate the mode shape. In another embodiment, the filter includes a polarization sensitive film, without grooves, which either absorbs or transmits the undesired mode. Specifically described is a buried heterostructure semiconductor DFB laser with such a reflection filter formed on at least one facet thereof.

Tranverse mode control in solid state lasers

Wide temperature range magnetic bubble memories are realized by using new compositions of rare earth garnets which require nonlinear bias field for operation over a given temperature range. The bias field structure for providing the corresponding nonlinear bias field includes plates of barium ferrite plus additional plates of Ni-Cu alloys and/or polycrystalline dysprosium (or other rare earths, singly or in combination) iron garnet to provide a nonlinear bias field versus temperature characteristic to match that of the bubble layer.

Bias magnet temperature tracking of magnetic bubble memories

Growing community of inventors

New Providence, NJ, United States of America

William J Tabor