Laurie L. Voci

Phase-conjugate Fizeau interferometer

We describe a phase-conjugate interferometer that consists of a partially transmitting conventional mirror placed in front of and in close proximity to a phase-conjugate mirror. The interferometer is self-referencing, compact, and insensitive to environmental disturbances, provides twice the sensitivity of conventional (nonphase-conjugate) interferometers, and produces a direct representation of an incident wave front. We have constructed such a device using internally self-pumped phase conjugation in barium titanate and have used the device to characterize the wave front produced by an aberrated optical system.

Gradient-index wide-angle photographic objective design

Wide-angle photographic lens systems utilizing axial gradient elements are studied. The resulting two- and three-element designs are compared with a six-element homogeneous wide-angle lens designed by Nippon Kogaku K.K., U.S. Patent 4,099,850. Practical considerations for manufacturing are also discussed.