1. The attenuation of the lamp power. Krypton lamp as a consumable, its efficiency in high-power use will slowly decay with the use of time, the decline in lamp power will also affect the laser power is not chaotic. In addition, because ordinary pure water contains a large number of microorganisms and various ions, these impurities are easily attached to the wall of the lamp at high temperature, which also causes the efficiency of the lamp to be reduced.

2. Mode volume of laser crystal. The size of the laser power is proportional to the mode volume in the laser crystal, and the larger the mode volume, the greater the laser power. However, with the increase of the injected electric power, the thermal effect of the crystal is also severe, resulting in a change in the volume of the crystal mode, affecting the laser power output.

3. Thermal deformation of the resonator mirror. The symmetrical parallel plane cavity has a large mode volume in the crystal, and with the increase of power, the thermal deformation of the lens leads to the change of the cavity type, and the transition from a random cavity to an unstable cavity, thus affecting the output of laser power.