摘要 |
PURPOSE: A mechanically simplified, high resolution, optical focusing and steering apparatus is provided to maintain a small, undistorted spot and maintain the average incidence angle within the angular tolerance of the target while providing a long-range of travel for the focused beam. CONSTITUTION: A method and apparatus for focusing a free beam of light onto a target, which is often very small or angle restricted, provide a lens(20) surrounded by two parallel windows. The focusing of the free beam is achieved by tilting the first window(30) to orient the beam of light through the lens onto the target, adjusting the lens focus to focus the beam of light into a focused spot, and tilting the second window(40) to translate the focused spot across the target. The lens may also be tilted to provide a greater range of translation.
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