Abstract: A mode matching gain element for an optical system is described, that supports a single mode of the optical signal, and that matches the incoming wavefront to a required outgoing wavefront. The incoming wavefront is passed through a phase conjugating structure, and the mode of the gain element is matched to the mode of the input and output optic fibers. The phase conjugating structure includes lenses or mirrors which time-reverse the incoming signal.

Abstract: A mode matching gain element for an optical system is described, that supports a single mode of the optical signal, and that matches the incoming wavefront to a required outgoing wavefront. The incoming wavefront is passed through a phase conjugating structure, and the mode of the gain element is matched to the mode of the input and output optic fibers. The phase conjugating structure includes lenses or mirrors which time-reverse the incoming signal.

Abstract: A mode matching gain element for an optical system is described, that supports a single mode of the optical signal, and that matches the incoming wavefront to a required outgoing wavefront. The incoming wavefront is passed through a phase conjugating structure, and the mode of the gain element is matched to the mode of the input and output optic fibers. The phase conjugating structure includes lenses or mirrors which time-reverse the incoming signal.

Abstract: An optical system for a Head Mounted Display for a virtual reality system that employs a single high-resolution display to generate separate right-eye and left-eye images for presentation to a user. The display projects a single image onto an array of adjacent lenses that serve to magnify it, and to project the image onto an optically distant diffuser screen. The diffuser screen, which increases the angular dispersion of the image, is in close proximity to a columnar array of microprisms. The microprism beam splitter serves to split the single image into separate right-eye and left-eye component images, and to direct each component image to its respective eyepiece at an off-axis angle. The optical system further includes two separate eyepieces, each including Fresnel lens/prisms that redeflect their respective images onto optical axes which are parallel to, but laterally displaced from the original, central optical axis.

Abstract: A coupling prism assembly between a light valve and a projection lens includes a right angle prism and a wedge prism. The right angle prism has two sides of substantially the same length and a hypotenuse side. The wedge prism has a side which is adjacent the hypotenuse side of the right angle prism. The light valve is adjacent one of the two sides of the right angle prism and the projection lens is adjacent the other of the two sides of the right angle prism. Light enters the coupling prism assembly through a second side of the wedge prism, passes in substantially a straight line through the wedge prism and right angle prism to the light valve where the light is modulated. The modulated light passes back into the right angle prism and is reflected by the hypotenuse side into the projection lens. In a color projection system, the light is split into three color components. A separate light valve is provided to modulate each color component which is directed to a projection lens.