The measurement and correction of wavefront aberrations of the 100 TW Ti:sapphire laser beam are presented. Several monochromatic aberrations, such as astigmatism ( Z 2 -2 , Z 2 2 ), coma ( Z 3 -1 ), trefoil ( Z 3 -3 , Z 3 3 ), and spherical aberration ( Z 4 0 ) are observed in the 100 TW Ti:sapphire laser beam as well as defocus ( Z 2 0 ), which is responsible for the converging or diverging of a laser pulse. An adaptive optics system using a bimorph deformable mirror successfully corrected a monochromatic wavefront in the 100 TW Ti:sapphire laser beam. The customization of the focal spot is also investigated using the adaptive optics system for research on the efficient generation of a high-energy electron beam. The increase in the depth of focus is demonstrated and the temporal broadening is calculated when the spherical aberration is introduced using the adaptive optics system.
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Jeong et al. (2007) studied this question.
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