An XY defocus aberration correction method for high-energy lasers
A method for correcting XY defocus aberrations,based on Hartmann-Shack wavefront sensor and two-dimensional beam-shaping light path,was presented due to the large percentage of defocus and 0°astig-matism aberrations with large PV values in high-energy laser beam.The first step is to derive an expression for XY defocus aberrations by linearly combining the defocus and 0° astigmatism terms of Zernike polynomi-als.The coefficients directly characterize the wavefront peak-to-valley(PV)values of X and Y defocus.At the same time,compensation for XY defocus wavefronts of the laser beam can be achieved by fine-tuning the mirror spacing in the two-dimensional shaping optics of the high-energy laser.Therefore,the Hartmann wavefront sensor is used to extract the coefficients of XY defocus aberrations from the laser beam.The com-puter dynamically adjusts the mirror spacing in the two-dimensional shaping optics based on these coeffi-cient values to correct XY defocus aberrations and improve the beam quality of the output laser beam.The results of the experiment showcase a significant decrease in PV value of XY defocus aberrations from 5.2 μm and 1.1 μm to less than 0.5 μm,as well as a decrease in β factor from 3.1 to 1.8,resulting in substantial im-provement in beam quality.
high energy laserbeam qualityaberration correctionbeam shapingmatrix optics
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