Influences of temperature rise of high-power laser cavity-mirrors on resonator parameters and far-field intensity

The influences of the thermal deformation of resonator mirrors induced by absorption of laser energy on geometric structure parameters of unstable resonators and intensity distributions of the far field were theoretically analyzed using finite difference methods. The far-field intensity distribution of virtual confocal unstable resonator under different thermal distortions was simulated. The results show that the resonator parameters changed significantly due to thermal deformation of the mirrors, and the central intensities of the far fields reduced obviously with thermal deformation increase.