James J Coleman

Title: James J. Coleman and a Zinc-Diffused AlGaAs/GaAs Laser

Introduction

James J. Coleman is an inventor associated with Champaign, Illinois, and the U.S. Navy. His recorded patent concerns the design and fabrication of a narrow-stripe AlGaAs/GaAs double-heterostructure laser.

Latest Patents

Coleman is credited with 1 patent: “Zinc-diffused narrow stripe AlGaAs/GaAs double heterostructure laser.” The invention describes a p-type gallium arsenide active layer positioned between two n-type aluminum gallium arsenide confinement layers. A narrow, zinc-diffused stripe extends lengthwise between reflective end surfaces and vertically into the layered structure, helping define the laser’s active region.

The disclosed fabrication method forms the layers through epitaxial growth or metalorganic chemical vapor deposition. Zinc is diffused through a slot in a mask to create the stripe, then driven into the device by heating it without the zinc source.

Career Highlights

The patent lists the United States of America, represented by the Secretary of the Navy, as the assignee. The work reflects research into semiconductor laser structures and methods for controlling the geometry of their active regions.

Collaborations

The patent’s listed coworkers include Chi-Shain Hong and P. Danial Dapkus. Their association with the work places Coleman’s invention within a collaborative effort in semiconductor laser research.

Conclusion

James J. Coleman’s recorded patent documents a zinc-diffusion approach to forming a narrow active stripe in an AlGaAs/GaAs double-heterostructure laser, with the U.S. Navy identified as assignee.