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VOLUME 51 (1990) | ISSUE 5 | PAGE 256
Second lasing threshold: onset of coherence
A new physical effect is discussed: a second threshold for lasing, at which coherence arises in the laser light. The laser light field increases to a value corresponding to a coherent state at a pump level above a threshold. At a pump level above the second threshold, the laser light is in a state close to coherence. In the region between the two thresholds, the state of the laser light is a substantially quantum-mechanical state, and far from coherent. The position of the second threshold is found. This position is found as a function of the superposition of active atoms in the state, i.e., as a function of the admixture of the lower working state in it.