Download Industrial Applications of Lasers by John F. Ready PDF

By John F. Ready

Business software of Lasers, moment variation covers laser basics, strange houses of laser gentle, sorts of useful lasers on hand, and common accent apparatus. The e-book additionally applies this data to current and constructing purposes

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It is convenient to discuss these aspects separately. These properties, which can be very different from ordinary light sources, enable lasers to be used for the practical applications that will be described later. A. Linewidth Laser light is highly monochromatic, that is, it has a very narrow spectral width. The spectral width is not zero, but typically it is much less than that of conventional light sources. The narrow spectral linewidth is one of the most important features of lasers. Early calculations [ 1 ] indicated that the linewidth could be a small fraction o f 1 Hz.

A. D. White and J. D. Rigden, Continuous Gas Maser Operation in the Visible, Proc. IRE 50, 1697(1962). F. Population Inversion W. R. Bennett, Gaseous Optical Masers, Appl. , Suppl. Opt. Masers, p. 24 (1962). G. Birnbaum, "Optical Masers," Academic Press, New York, 1964, Chapter 2. Τ. H. Maiman, Stimulated Optical Emission in Solids. I. Theoretical Considerations, Phys. Rev. 123, 1145(1961). J. P. Markiewicz and J. L. Emmett, Design of Flashlamp Driving Circuits, IEEE J. Quantum Electron. QE-2, 707(1966).

Many photo­ tube-oscilloscope combinations are too slow to record the rapid fluctuations. The minimum pulse duration that can be obtained by g-switching techniques is of the order of 10 nsec. In order to obtain still shorter pulses, other techniques involving mode-locking are employed. In most common lasers, a number of longitudinal modes, at slightly different frequencies, will be present simultaneously. Ordinarily, the phases of these modes will be independent of each other. Under some conditions, the relative phases of the modes can interact with each other and become locked together.

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