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Prog. Theor. Phys. Supplement No.64 (1978) pp. 321-338
Optical Instabilities from the Entropy Production Point of View
Hiroshi Hasegawa and
Teruaki Nakagomi
Department of Physics, Kyoto University, Kyoto 606
Abstract:
Laser is an ideal object of study by which the nonlinear, nonequilibrium statistical mechanics might test a perspective, and one finds thermodynamically more to explore in the previous establishments for this purpose. Our findings are the following: (1) The minimal principle of entropy production succeeds in characterizing the correct steady-lasing state, establishing its physical picture that the lasing mode of the electro-magnetic field is in contact with two reservoirs, the atoms and the cavity, from the former of which energy flows to the latter steadily such that the total dissipation costed at the two contact points be minimal. (2) In the course of approach to the steady state, the relative entropy to be associated with the fast-relaxing subsystem which complements the coarse-grained relative entropy associated with the slow subsystem can exhibit a decrease, showing the “Maxwell demonism” inherent to such dissipative dynamics with instability. The decrease implies a formation of some organized motion in the fact subsystem and is reflected by an enhancement of the dissipation in the counter subsystem called “anomalous fluctuation”.
URL :
http://ptp.ipap.jp/link?PTPS/64/321/
DOI : 10.1143/PTPS.64.321
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Citing Article(s) :
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Progress of Theoretical Physics Vol. 63 No. 6 (1980) pp. 1865-1884
:
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Contraction of State Variables in Non-Equilibrium Open Systems. I
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Hazime Mori, Terumitsu Morita and Kazuko T. Mashiyama
