Intracavity aberration compensation of laser mode using membrane deformable mirror

The influence of resonator aberration upon the laser output mode is analyzed and simulated with Fox-Li method. The aberration is expanded by Zernike polynomials, and laser self-reproducing low-order modes upon aberrations with different Fresnel number has been calculated. The mirror surface is also fitted by Zernike polynomials and the influence function of the central actuator is calculated. At the same time the control model of the mirror is established. Compensation of laser output mode was validated by experiment using the deformable mirror as an end mirror of the laser resonator, an output with mostly TEM00 mode was got by the deformable mirror compensation.