Titlebook: Engineering Applications of Lasers and Holography; Winston E. Kock Book 1975 Springer Science+Business Media New York 1975 Speckle.coheren

過渡時期

Introduction,omplish their purpose, and the images which result, however, are quite different. As the words . (complete) and . (message) connote, the hologram captures the entire message of the scene in all its visual properties, including the realism of three dimensions. The photograph, on the other hand, colla

Climate

Fundamental Wave Properties,n in Figure 1.1. Because all wave energy travels with a certain speed, such water waves move outward with a wave speed or . Waves also have a ., the distance from crest to crest; it is usually designated, as shown, by the Greek letter λ. If, in Figure 1.1, we were to position one finger so that it j

母豬

Wave Coherence,ch have this single-frequency property are said to have good frequency coherence. Light from a laser (particularly a gas laser) is said to exhibit an extremely high degree of frequency coherence. Because of the importance of wave coherence in holography, let us examine what the term coherence means.

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Hologram Fundamentals,rded; almost invariably, it is an extremely complicated one. The other is usually rather simple, often being a set of plane waves. This second set is called the reference wave, and, in reproducing or reconstructing for the viewer the originally recorded scene, a similar set is used to illuminate the

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Properties of Holograms,e voiced publicly; a few examples of such questioning will be included in the following discussion of hologram properties. Probably the most spectacular characteristic of holograms, and the one undoubtedly responsible for the tremendous popular interest they have evoked, is their ability to create a

脫水

Laser Fundamentals, Physics was awarded jointly in 1964 to the U.S. scientist, Charles H. Townes, then at the Massachusetts Institute of Technology in Cambridge, Massachusetts, and to the Soviet scientists A. M. Prokhorov and N. Basov, both at the Lebedev Institute in Moscow. Figure 6.1 is a photograph of Professor Pr

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NAG

Lasers in Measurement,oherence has made it useful in applications for high-precision measurements of length, strain, velocities, distance, and even the size of extremely small particulate matter in air or other gases. Other measurement applications include the monitoring of pollutants in the air and noncontact measuremen

parallelism

Microwave Holography,ent reference wave generated by the same source, then one can say that the first microwave hologram was made at the Bell Telephone Laboratories in 1950.. In that work, only the holograms (the interference patterns) themselves were of interest, and no wave reconstruction was performed; nevertheless,