Abstract
ABSTRACT Many factors of intracavity perturbation will degrade the output power and beam quality for high power passive Q-switched slab laser. In the paper, the experiment test on the output beam quality of a passive Q-switched zig-zag slab Nd:YAG laser has been performed by adopting Hartmann-Shack (H-S) wavefront sensor and Zernike mode reconstruction theory. In this way, the PV and RMS values of the wavefront aberration, every order zernike aberrations can be acquired accurately, and the point spread function (PSF) of the beam and the distribution of circle energy can also be obtained by further calculation, so the beam-quality can be known fully. The experimental results show that the wavefront aberration of laser is mainly concentrated in the frontal 10 ranks of Zernike aberration, mainly including the defocus A 3 , the low-order astigmatism A 5 , the coma aberration A 6 and the spherical aberration A 10 because of the crystal thermal effect and the intraca vity aberrated perturbation. Key words: Information optics; pulsed slab laser; H-S wavefront sensor; phase reconstruction; mode properties; Zernike aberration
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