James F Lotspeich

Title: Innovations of James F. Lotspeich

Introduction

James F. Lotspeich is a notable inventor based in Malibu, California. He has made significant contributions to the field of electro-optics, holding three patents that showcase his innovative spirit and technical expertise.

Latest Patents

One of his latest patents is the Iso-index coupled-wave electro-optic filter. This invention involves narrow-band optical filters that utilize a birefringent crystal, which exhibits a change in sign in birefringence at a predetermined wavelength. The design relies on wave coupling between ordinary and extraordinary polarizations of light at or near this predetermined wavelength. The crystal is strategically placed along the light path between appropriately oriented polarizers, with a direct current (dc) electric field applied either parallel or perpendicular to the light path. This electric field facilitates wave coupling for light at the filter's center wavelength, which typically matches the predetermined wavelength. Additionally, the filter's center wavelength can be adjusted by employing a spatially periodic electric field.

Another significant patent is the electro-optic tunable optical filter. This invention features electronically tunable optical filters that apply a spatially varying dc electric field to successive regions of a birefringent crystalline medium. This medium is positioned between a pair of suitably oriented polarizers along the light beam's path. The dc electric field, which can be oriented either parallel or perpendicular to the light path, electro-optically induces an effective oscillation of the optic axis of the medium. This oscillation occurs about the pass direction of the input polarizer in a plane perpendicular to the light path, with a predetermined spatial variation to achieve desired filter transmission characteristics. The electric field is generated from programmable control voltages, allowing for a wide variety of filter passband or stopband characteristics.

Career Highlights

James F. Lotspeich has had a distinguished career at Hughes Aircraft Company, where he has been instrumental in advancing optical technologies. His work has significantly impacted the field of electro-optics, leading to innovations that enhance the performance of optical filters.

Collaborations

Throughout his career, Lotspeich has collaborated with notable colleagues, including Richard L. Abrams and Douglas A. Pinnow. These collaborations have contributed to the development of cutting-edge technologies in the field.

Conclusion

James F. Lotspeich's contributions to electro-optics through his innovative patents demonstrate his expertise and commitment to