Concentration gradient design method of laser amplifier gain medium and laser amplifier gain medium

The invention discloses a concentration gradient design method of a laser amplifier gain medium and the laser amplifier gain medium, relates to the technical field of laser amplification, and aims to solve the heat effect problem of non-uniform heat distribution caused by non-uniform pump light absorption distribution of the laser amplifier gain medium. According to the technical key points, the method comprises the following steps: calculating according to a heat conduction equation to obtain corresponding phase differences of all sections of a crystal when seed light passes through a pump light area when the seed light is amplified by a laser amplifier; the phase differences of the seed light passing through the sections of the crystal are equal, so that the corresponding phase differences of the sections of the crystal are equal when the seed light passes through the pump light area; carrying out iterative solution by utilizing simulation software to obtain an absorption coefficient of each section of the