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This article is cited in 3 scientific papers (total in 3 papers)
METHODOLOGICAL NOTES
Another look at what is possible and impossible in optics
I. I. Sobel'man P. N. Lebedev Physical Institute, the USSR Academy of Sciences, Moscow
Abstract:
According to the Lagrange–Helmholtz law, no optical system can ever increase the brightness (and therefore the effective temperature) of a light beam. This limitation is frequently interpreted as a consequence of the second law of thermodynamics. Actually, thermodynamics imposes no limitations of practical importance on the possibilities of increasing the brightness of light beams: the decrease of the entropy of the light beam associated with the increase of its brightness can be compensated by a loss of a negligible fraction of the energy of the beam. The general discussions are illustrated by a number of specific examples.
Citation:
I. I. Sobel'man, “Another look at what is possible and impossible in optics”, UFN, 113:4 (1974), 701–705; Phys. Usp., 17:4 (1975), 596–598
Linking options:
https://www.mathnet.ru/eng/ufn10224 https://www.mathnet.ru/eng/ufn/v113/i4/p701
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Abstract page: | 42 | Full-text PDF : | 22 |
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