Focal switch of cosine-Gaussian beams |
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Authors: | Xiaoling Ji Baida Lü |
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Affiliation: | (1) College of Electronic Engineering, Sichuan Normal University, Chengdu, 610066, China;(2) Institute of Laser Physics & Chemistry, Sichuan University, Chengdu, 610064, China;(3) State Key Laboratory of Laser Technology (Huazhong University of Science and Technology), Wuhan, 630074, China |
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Abstract: | The focal switch of cosine-Gaussian (CsG) beams passing through a system with the aperture and lens separated is studied analytically and numerically. It is shown that the focal switch of CsG beams can appear not only for the apertured case, but also for the unapertured case. The necessary condition for the focal switch is that truncation parameter α > αc and the beam parameter β > βc, αc, βc being the corresponding critical values. There exists a maximum of the relative transition height Δz sw as α varies, and Δz sw increases with increasing β and decreasing N w. The normalized axial intensity minimum I min / I max decreases with an increase of α and β, and I min / I max remains unchanged as N w varies. |
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Keywords: | cosine-Gaussian (CsG) beam focal switch apertured and unapertured cases |
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