Stars generally do not emit coherent light, but rather emit incoherent light due to the thermal radiation processes occurring in their interiors. Coherent light refers to light waves that have the same frequency, phase, and direction. However, there is an exception to this rule known as stimulated emission, which is the principle behind lasers.
In stimulated emission, atoms or particles in an excited state can be stimulated by incident photons of a specific frequency to release additional photons that are coherent with the incident photons. This process amplifies the light and produces a coherent beam.
TVLM 513-46546, also known as LSPM J1548+1245, is a low-mass star or brown dwarf located in the constellation Boötes. It is a relatively cool and dim star, with a spectral type of M8.5V. While it is not known for emitting coherent light, it is possible that the mention of TVLM 513-46546 radiating coherent light might be a misunderstanding or confusion.
Coherent light emission is typically associated with laser systems, where specific conditions are created to achieve stimulated emission and produce a coherent beam. These conditions include having a gain medium (such as a crystal, gas, or semiconductor) that can amplify light, creating a population inversion (where more particles are in the excited state than in the ground state), and using mirrors or other optical elements to provide feedback and maintain coherence.
In summary, while stars like TVLM 513-46546 do not naturally emit coherent light, the concept of coherent light emission is mainly associated with artificial light sources like lasers rather than astronomical objects.