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VOLUME 51 (1990) | ISSUE 5 | PAGE 259
Second (quantum) threshold of a laser
The quantum-mechanical nature of electromagnetic radiation is responsible for the existence of two threshold values of the gain. When the first of these thresholds is exceeded, there is an exponential and incoherent increase in the number of photons in the resonator. When the second threshold is exceeded, a coherent field begins to form.