A Power-Independent Term in the Quantum-Limited Linewidth for the Scully-Lamb Laser Model : General Physics

概要

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The quantum-limited linewidth for the Scully-Lamb laser model is discussed in density matrix approach with emphasis on a relation to the field intensity. It is shown that a power-independent term in the linewidth, i.e., the upper-limit of the phase diffusion time, exists due to gain saturation. The linewidth is constant on the field intensity far above threshold, where the photon statistics is similar to the Poisson distribution. The well-known inverse proportionality of the linewidth to the field intensity is valid only in the limited region slightly above threshold, where the photon statistics is quite different from the Poisson distribution. Exact expression of the spontaneous emission rate obtained from the linewidth shows that spontaneous emissions should be attributed to both the gain and the loss mechanisms.
社団法人日本物理学会の論文
2000-05-15