Wasatch Photonics, Inc.

Gerald Lee Heidt

LeRoy Dickson

Richard Dennis Rallison

Elroy Louis Pearson

A system includes a light source and a grating cube. The grating cube includes a transmission volume holographic grating positioned between two prisms. The transmission volume holographic grating diffracts part of a light source emission toward a reflective surface, producing diffracted light. At least some of the diffracted light is reflected off of the reflective surface, producing feedback light. The feedback light is fed back to the light source, thereby causing the light source emission to have the same wavelength as the feedback light.

Grating for tuning a light source

A multi-element diffraction grating is disclosed. The multi-element diffraction grating may be configured to diffract incident radiation with high dispersion using at least two holographic optical elements. The multi-element diffraction grating may include a first volume phase grating that is one of the holographic optical elements. The multi-element diffraction grating may also include at least one additional volume phase grating that is the second holographic optical element. The first volume phase grating and each of the additional volume phase gratings may be positioned relative to each other such that the radiation propagates through and is diffracted by the first volume phase grating and each of the additional volume phase gratings.

High dispersion diffraction grating including multiple holographic optical elements

A fingerprint reader is described. The fingerprint reader includes an illumination source that produces light and a camera. An optical window is also part of the reader. The window is positioned so that light from the illumination source passes through the optical window and then is reflected to the camera for imaging a person's fingerprint. A filter may be positioned on or proximate to the optical window. The filter prevents ambient light from reaching the camera. In some situations, the filter will be a dielectric mirror, a dielectric filter, a holographic mirror, a holographic filter, a dichroic mirror or a dichroic filter.

Ambient light rejection filter

An eyepiece assembly for use in a rifle scope may include an eyepiece that is made of a material that is transparent to light. A holographic reticle may be positioned within the eyepiece. The eyepiece assembly may also include a chrome reticle. The chrome reticle may be positioned so that the chrome reticle is aligned with the holographic reticle. A cover portion may be attached to the eyepiece.

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Nibley, UT, United States of America

Gerald Lee Heidt