An optical glass having a high index of refraction, a low dispersion, and low color, consists essentially of lanthanum oxide (La.sub.2 O.sub.3), thorium dioxide (ThO.sub.2), tantalum pentoxide (Ta.sub.2 O.sub.5), boric oxide (B.sub.2 O.sub.3), silicon dioxide (SiO.sub.2), and germanium dioxide (GeO.sub.2).

An optical encoder is disclosed utilizing a V-scan method of read-out which provides the output for each track of a code disc and the complementary output of that track. Each track, except the least significant track of the code disc, is provided with two pair of photocells, one to produce the leading and complementary leading output and the other to produce the lagging and complementary lagging output. A novel electrical circuit is utilized by the encoder to reduce the number of components requ...

Non-impact printing or recording apparatus adapted for use with a digital computer. The apparatus is characterized by the employment of an optical character generator and timing system therefor capable of printing information on a moving photoresponsive medium.

An optical aid is disclosed in several embodiments employing fiber optic cable to transmit light to the side of desired insertion of an electrical lead to better and more quickly identify said site thereby achieving cost savings and greater reliability in harness making. Embodiments are included wherein the optical aid may be programmed to provide a program wiring technique.

An optical metronome using a strip with musical staff thereon folded in zig-zag form moved past a lamp in accordance with the speed of the musical tempo. The notes therefor are viewed through a channel window as the strip moves from one triangularly shaped depository to another.

An optical reflector is disclosed having a glass base substrate which may be in a spherical form. The substrate has six thin alternate high and low index of refraction dielectric layers vacuum deposited on it. The high index material is first deposited directly on the substrate and the finally deposited is of a low index of refraction material.

An optical reflector suitable for use in spotlights for projectors to direct light from a source through a gate to a lens system forming an objective. The reflector is so shaped that a substantial even field of illumination is obtained at the gate.

An optical probe having simplified and optically improved means for obtaining movement of the field of view attitude and perspective. High light efficiency, optical resolution and depth of focus are provided, together with a substantial reduction in the number of optical and mechanical elements as compared to conventional visual flight simulation systems. A television camera has its field of view through a minor portion of the field of view of an extremely wide angle lens, and relative movement ...

An optical isolator is constructed using a pair of rotating half-wave plates as the active elements. In a first embodiment, the rotating half-wave plates are arranged in series between a pair of linear polarizers, the spacing between the plates being adjusted to pass light travelling in one direction but not in the opposite direction. In a second embodiment, a Fabry-Perot interferometer is positioned between two rotating half-wave plates so as to pass circularly polarized light travelling in one...

An optical upconverter having a pump beam, a signal beam, and an optically onlinear material for mixing the pump and signal beams to obtain an output beam having a frequency which is the sum of the pump and signal beams. The pump beam is generated by a laser and the nonlinear material is mounted in the laser cavity. The laser beam is a linearly polarized plane wave. The signal beam is directed into the cavity through a polarizer which linearly polarizes the signal beam in a direction which is or...