Abstract
Experiments have been carried out to study the transient radiation-induced absorption in the active core of a double-clad ytterbium fiber and the response of a laser based on it under the impact of pulsed X-rays. It has been found that the time of loss of laser performance (downtime) under pulsed irradiation increases with an increase in the absorbed dose rate of radiation and a decrease in the laser pump power and reaches values of ~1 ms. An analysis of the experimental results shows that the laser response to the action of X-rays pulse is determined by radiation-induced losses in the active fiber core. A experimental-calculated method for estimating the radiation reaction of a laser, based on the results of studies of the active fiber, is proposed.
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