Spontaneous generated coherence (SGC) is a phenomenon that occurs in certain systems, such as lasers, where a large number of particles behave in a collective manner and exhibit coherent behavior without any external stimulation or input.
In stimulated emission, a photon is emitted from an excited atom or molecule due to the presence of an external electromagnetic field. In contrast, SGC does not require an external field and instead arises from the collective behavior of particles within the system.
SGC plays a crucial role in the operation of lasers by providing a mechanism for the amplification of light. In a laser, SGC allows for the creation of a population inversion, where more atoms or molecules are in an excited state than in a lower energy state, leading to the emission of a coherent beam of light.
Yes, SGC has been observed in various natural systems, such as biological systems and atmospheric gases. In these cases, the coherence arises from the collective behavior of particles within the system, similar to how it occurs in lasers.
SGC has potential applications in various fields, including quantum information processing, optical sensing, and spectroscopy. It also has potential uses in developing more efficient and precise lasers and other optical devices.