Word: lasered
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...picture. The overlapping of spots, no matter how blurred the image, can be expressed in complex mathematical terms called Fourier transforms. Applying mathematical theory to holography, which also produces interference patterns that can be expressed by Fourier transforms, Stroke set up the optical equivalent of an equation. Using laser light, he made two transparencies -one of the blurred photograph of a microscope, the other of a purposely blurred picture of a spot of light shot by the same camera. Then he produced a hologram by projecting laser light through the blurred light-spot transparency onto unexposed film while simultaneously shining...
Having set up the optical equivalents of Fourier transforms, Stroke beamed laser light first through the transparency of the blurred microscope photograph and then through a "dividing" filter that consisted of both the hologram and the transparency of the blurred spot of light; in mathematical terms, he had thus divided one transform by another. Projected onto film the beam produced a crude but noticeably clearer picture of the microscope. Stroke had solved his optical equation...
...camera on the moon last week appeared to show only a crescent-shaped earth glowing in the lunar sky. But closer inspection showed two seemingly insignificant starlike dots of light on the night portion of the earth. They were historic dots. Each represented the light from an argon-ion laser beam aimed from Tucson, Ariz., and Wrightwood, Calif., at Surveyor's location near the lunar crater Tycho, some 240,000 miles away...
...engineering test that was a preliminary to actual laser experiments during the Apollo moon mission, a group headed by University of Maryland Physicists Carroll Alley and Douglas Currie set up the lasers in four East Coast locations in addition to the two in the West. Each was projected backwards through a telescope-into the viewing end-toward Surveyor's lunar site. The telescopes were used not only to aim the beams precisely but also to further confine the beam of the coherent laser light, which diverges very little even without telescopic aid. Alley estimates that both beams had diverged...
When Apollo astronauts finally set down on the moon, one of their tasks will be to set up an array of reflectors. Scientists will bounce more powerful ruby laser pulses off the reflectors and will measure the time it takes for the pulses to return to earth. This data will enable them to determine the distance from earth to a fixed point on the moon with an accuracy of 6 in., measurements that should enable scientists to learn the precise size of the moon, to analyze its motions, to confirm continental drift on the earth, and perhaps even to learn...