DENG XIMINg, CHEN ZHEZUN. On the invariable property of internal energy of paraxial beam cross-section[J]. Acta Optica Sinica, 1983, 3(5): 385
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A physical concept called internal energy have been set up from the hydrodynamic model describing the light beam transmission[1]. In this paper authors expect to demonstrate that for any stable paraxial light beam transmitting in vacuum, the internal energy of the light beam is not dependent on the position of the beam cross-section. In other words, in the cause of transmitting, the internal energy is a constant.