Abstract: This invention detects mass and mass motion of external objects by virtue of its action as a gravimeter, gravity gradiometer, and detector of gravitational fields. This invention is for devices which function as accelerometers and gyroscopes for the bodies to which they are attached.

Abstract: A superconducting gravitational wave senser includes a toroid-like torque body having first and second diametrically opposed mass objects to provide a bi-pole mass distribution about its Z-axis for torque perturbations by gravitational waves. The torque body includes superconducting material that produces a magnetic field when perturbed; the field indicative a gravitation wave.

Abstract: This invention detects mass and mass motion of external objects by virtue of its action as a gravimeter, gravity gradiometer, and detector of gravitational fields. This invention is for devices which function as accelerometers and gyroscopes for the bodies to which they are attached.

Abstract: In an interferometer apparatus used for monitoring an object surface, the apparatus having a source of coherent light, a beam splitter for dividing the coherent light into a reference beam and an object beam, another beam splitter for dividing the object beam into two separate portions, and a light detector for detecting light interference, comprising an externally-pumped phase-conjugate mirror working in conjunction with a self-pumped phase-conjugate mirror. The externally-pumped phase-conjugate mirror receives the reference beam, receives one portion of the object beam, and reflects the received portion of the object beam to the detector as a first phase-conjugate beam. The self-pumped phase-conjugate mirror receives a second portion of the object beam and reflects the received portion of the object beam to the detector as a second phase-conjugate beam.

Abstract: An improved laser-driven, two-way optic communication system for atmosphe use and enabling communication between remote stations. The system is generally made up of a transmitter-receiver (TR) arrangement at one station and a cooperative transmitter-receiver (CTR) arrangement at another station. The TR arrangement is generally made up of laser source beam means, polarizer means, polarized beam rotater means and appropriate lens means. The CTR arrangement is generally made up of appropriate lens means, beam splitter means and first and second phase conjugate mirror (PCM) means. The PCM means are mounted on piezoelectric means that are selectively dithered so as to enable control of the return signal. The TR means causes propagation of a rotated laser source beam polarization output via the atmosphere to the CTR arrangement during system use.

Abstract: An optical prism, with an input surface, a reflecting surface and a base, and with a diffraction grating formed on the reflecting surface. The prism is designed so that if an input beam is incident normal to the input surface, then the efficiency of the order diffracted in the direction opposite the input beam is greater than a predetermined value. If the prism is fabricated of a material with index of refraction n, then the resolving power of the grating is increased by n.

Abstract: A speckle interferometer including a beam splitter, a mirror in the object beam arm, a phase-conjugate mirror in the reference beam arm, a converging lens and a photographic film. Laser light scattered retro-reflectively from a rough surface under investigation and passed through an imaging lens illuminates the interferometer. Fringes occur upon sandwiching a pair of exposures of the interference pattern made before and after deformation of the rough surface. The relative magnitude of the displacements from the original position at different points of the surface can be determined from the position of the fringes.

Abstract: An interferometer which retains the lateral vibration rejection capability of a three-beam interferometer and maintains a large work space between the beams while improving longitudinal vibration noise rejection. The system makes use of beam splitting assemblies which split the source laser beam into three beams and then recombine the beams. The recombination assembly includes wedges which introduce a small angle between the outer beams so that a small number of fringes are formed across the diameter of the beam.