Zhikun Yang, Xiaohui Ma, Xinglei Lin, Yingtian Xu, Liang Jin, Yonggang Zou, He Zhang
In this study, a confocal optical system formed by a combination of two axicon lenses, a parabolic annular mirror and a concave mirror was used to obtain an adjustable microstructured beam. The two axicons were used to create a collimated hollow annular beam whose diameter varies with the distance between the two components, and the duty cycle of the hollow beam changes accordingly. At the same time, the annular factor also changes correspondingly after the hollow beam was concentrated. According to the scalar diffraction integral theory, the change of focusing characteristics of different annular factor after a parabolic annular mirror was studied. The concentrated beam was reflected by a concave mirror to form a confocal optical system. According to the numerical simulation, the size of the focused spot varies from 2.8 to in the range of the annular factor from 1.19 to 1.09. Detailed characteristics of the microstructure beam shape changes were analyzed. These results have important implications for particle manipulation and other applications.
DOI
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