Collective Phenomena in Quantum Optics
One of the recent chapters of physics has been the study of fluctuations and coherence in lasers: how and why 1020 atoms or molecules, rather than radiating e.m. field in a chaotic fashion, decide to “cooperate” to a single coherent field mode; then, for still higher excitation, how and why they organize in a complex pattern (many modes), each per-se highly coherent but with little correlations with one another. Such a “turbulent” stage has a “complexity” today represented by the word “chaos”.
KeywordsPhoton Number Laser Threshold Single Mode Laser Solid Gain Average Photon Number
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