ИСТИНА

Traditionally the effect of the Brownian noise is calculated as if the beam is reflected from the surface of the mirror's coating fluctuating as an incoherent sum of the fluctuations of each layer and of the substrate. However, the beam actually penetrates the coating and Brownian expansion of the layers leads to dephasing of interference and consequently to additional change in reflected phase and amplitude. The analyze of different effects and strategies aimed at decreasing the thermal coating noise for a generalized multilayer reflective coating, taking this effect into account, is described.