Encyclopedia of Physical Science and Technology - Lasers and
9 years has handed because the 1992 moment version of the encyclopedia was once released. This thoroughly revised 3rd variation, that is a college point compendium of chemistry, molecular biology, arithmetic, and engineering, is refreshed with a variety of articles approximately present examine in those fields. for instance, the hot variation has an elevated emphasis on info processing and biotechnology, reflecting the fast progress of those parts. the continued Editor-in-Chief, Robert Meyers, and the Board ready a brand new topical define of actual technology and know-how to outline whole insurance. part editors are both Nobel Laureates or editors of key journals of their fields. extra Board participants representing the worldwide clinical neighborhood have been additionally recruited.
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B. All-Gas-Phase Chemically Pumped Iodine Laser Another key metastable energy carrier is NCl(a 1 ), which is isovalent with NF(a 1 ) and O2 (a 1 ). The discovery of the efficient energy transfer from NCl(a 1 ) to atomic iodine opened the door to an all-gas-phase, chemically pumped atomic iodine laser operating at the same wavelength as COIL. Indeed, a subsonic transverse flow device NCl(a 1 2 ) + I( P1/2 ) → NCl(X ) + I P1/2 . 2 (14) (15) (16) (17) In the first demonstration of lasing in this system the fluorine atoms were generated in a dc discharge.
It can be operated either cw or pulsed. The broad bandwidth makes it especially suitable for use in mode-locking to generate ultrashort light pulses. It can be either flashlamp pumped or laser pumped, the latter being the most common due to the relatively short upper laser level lifetime, which makes flashlamp pumping less efficient. 4. Color-Center Laser Color-center lasers use a different form of impurity species implanted in a host material in quantities of 1 part per 10,000. In such lasers the laser species is generally produced by irradiating the crystal with X-rays to produce defects that attract electrons.
Miller, J. (1987). In “Proceedings International Conference on Lasers, 1987,” STS Press, McLean, VA. Pimentel, G. C. (19 ) Sci. Am. 214, 32. Schawlow, A. L. (19 ) Sci. Am. 219, 120. Truesdell, K. , and Lamberson, S. E. (19 ) “SPIE Proceedings International Symposium on 9th Gas Flow Chemical Lasers,” p. 476. Truesdell, K. , Helms, C. , and Hager, G. D. (19 ) “SPIE Proceedings 10th International Symposiun on Gas Flow Chemical Lasers,” p. 217. Verdyen, J. T. (1989) “Laser Electronics,” Prentice-Hall, Englewood Cliffs, NJ.