Patent ID: 7813644

Claim:
A steerable-light-path optical device, comprising: a light transceiver having an external light path associated therewith, wherein the light transceiver transmits a first light beam at a first infrared wavelength, and receives a second light beam at a second infrared wavelength different from the first infrared wavelength, and wherein the first light beam and the second light beam are substantially parallel to each other and to the light path; and a path-steering device that controls the direction of the light path relative to a steering axis, wherein the path-steering device comprises a first beam-deviation optical element, including a first prism structure having a first diffraction grating thereon, comprising at least two first-structure prisms, wherein the first diffraction grating is on a surface of one of the first-structure prisms, and wherein the steering axis passes through the first beam-deviation optical element, a second beam-deviation optical element, including a second prism structure having a second diffraction grating thereon, wherein the steering axis passes through the second beam-deviation optical element, and a rotational drive operable to rotate at least one of the first beam-deviation optical element and the second beam-deviation optical element about the steering axis.