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Though laser physics began at 1960s, its entropy evolution has not beentouched until very recently the Kraus-form solution of laser's master equationis reported (Ann. Phys. 334 (2013)). We study the new physics based on thediscovery in this paper. We analyze time evolution of physical observables andquantum optical properties in the laser process with arbitrary initial states,such as the photon number, the second degree of coherence, etc. The evolutionof entropy of these states is also studied. Our results well conform with theknown behaviour of laser, which confirms that the master equation describeslaser suitably, and the Kraus-form operator solution is correct, elegant anduseful.

Evolution of physical observables and entropy in laser process studied on the basis of Kraus-form solution of laser's master equation