L Ralph Dawson

Title: L Ralph Dawson: Innovator in Infrared Emitting Devices

Introduction

L Ralph Dawson is a notable inventor based in Albuquerque, NM, who has made significant contributions to the field of infrared emitting devices. With a total of three patents to his name, Dawson's work focuses on advanced semiconductor technologies that have applications in various optical devices.

Latest Patents

Dawson's latest patents include an innovative infrared emitting device and method. This device utilizes a III-V compound semiconductor substrate, featuring a quantum-well active region with multiple quantum-well layers made from a ternary alloy of InAsSb. These layers are strategically sandwiched between barrier layers that possess a smaller lattice constant and a larger energy bandgap. The design aims to enhance the threshold energy for Auger recombination by compressively straining the quantum-well layers. Additionally, the invention describes methods for determining the optimal thickness of these layers. The embodiments of this invention include surface- and edge-emitting light-emitting diodes (LEDs), optically-pumped semiconductor lasers, and electrically-injected semiconductor diode lasers, all emitting light in the midwave infrared spectrum ranging from about 2 to 6 microns.

Another significant patent is for a long wavelength, high gain InAsSb strained-layer superlattice. This high gain photoconductive device is designed for 8 to 12 micrometer wavelength radiation. It features an active semiconductor region that extends from a substrate to an exposed face, comprising a strained-layer superlattice of alternating layers of two different InAs1-xSbx compounds with x greater than 0.75. The device includes spaced electrodes on the exposed face, allowing for substantial photoconductive gain in response to changes in radiation.

Career Highlights

Throughout his career, L Ralph Dawson has worked with prominent organizations, including the United States of America as represented by the United States and Sandia Corporation. His contributions to the field have been recognized through his patents and the impact of his work on infrared technologies.

Collaborations

Dawson has collaborated with notable colleagues such as Steven R Kurtz and Robert M Biefeld, further enhancing the innovative potential of his projects.

Conclusion

L Ralph Dawson's work in the field of infrared emitting devices showcases his expertise and commitment to advancing semiconductor technology. His patents reflect a deep understanding of materials and their applications, contributing