Effect of quartic-phase aberrations on the focal switch of Hermite–Gaussian beams |
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Authors: | Baida Lü Xiangyang Tao Yiyou Nie |
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Institution: | aCollege of Physics and Communication Electronics, Jiangxi Normal University, Nanchang, 330027, PR China;bInstitute of Physics and Chemistry, Sichuan University, Chengdu, 610064, PR China |
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Abstract: | The focal switch of Hermite–Gaussian beams diffracted at an aperture and subsequently focused by a spherically aberrated lens is studied. Our main attention is focused on the effect of quartic-phase aberrations on the behavior of the focal switch. It is shown that quartic-phase aberrations affect the relative focal shift Δzf, turning position s1,t, and relative transition height Δzsw. Apart from a critical maximum truncation parameter αc,max, there is a critical minimum truncation parameter αc,min. Within the region αc,min<α<αc,max the focal switch can take place, but quartic-phase aberrations give rise to a decrease of αc,max-αc,min in comparison with the aberration-free case. |
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Keywords: | Focal switch Quartic-phase aberrations Hermite– Gaussian beam System with aperture and lens separated |
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