Attenuation of Laser Radiation in Wireless Underwater Laser Communication Channel Considering Transition between Media

A series of experiments was carried out to measure the attenuation of laser radiation for four wavelengths of visible wavelength range on routes of different lengths in a water medium on the installation. The aim of the work was to estimate the loss of optical power of lasers in a water medium, taking into account the transition between media. In both cases, losses caused by transitions of laser radiation between different media (air-glass-water) were taken into account. Obtained experimental data was compared with two mathematical models for calculating the attenuation of the optical signal power in a wireless underwater laser communication channel. The data showed the need to refine mathematical models for pure fresh water.