Spherical Aberration

Kingslake, R.; Johnson, R. Barry

doi:10.1016/b978-0-12-374301-5.00010-3

Cited by 1 publication

(7 citation statements)

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“…The relationships in Eqs. (5) and (6) are sufficient for choosing the optimization starting point for a system with a low-power laser source. However, for high-power laser sources, this choice is complicated significantly by considering the locations of the FGR fields in the mirror space of the scanning system.…”

Section: Spontaneous and Optimized Aplanatizationmentioning

confidence: 99%

“…Consequently, the starting curvature of the input surface should be chosen such that the aplanatism conditions [Eqs. (5) and (6)] are satisfied, but the starting curvature does not fall into the ranges of the forbidden values [Eqs. (26) and (27)].…”

Section: Selection Of Starting Point For Optimization Ofmentioning

confidence: 99%

“…The dashed vertical lines are the aplanatism estimates given by Eq. (5). It is apparent from the figure that, for high-power systems, only large scanners with flat menisci can be reliably used.…”

Section: Selection Of Starting Point For Optimization Ofmentioning

confidence: 99%

“…Correspondingly, a decrease in the x − y separation moves the entrance pupil closer to the meniscus, shifting the aplanatism condition [Eq. (5)] to larger curvatures. Basically, the optimal curvature ranges of the menisci of most compact scanners are still overlapped by the forbidden ranges.…”

Section: Selection Of Starting Point For Optimization Ofmentioning

confidence: 99%

“…Despite the simplicity of such systems, 5 optimization of a scanner with a meniscus singlet is difficult because of the small number of variables. When all variables are freely assigned, the optimal configuration tends to yield a very thick meniscus 6 with a localized entrance pupil, which is achieved by setting the distance between the scanner mirrors to approximately zero.…”

Section: Introductionmentioning

confidence: 99%

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Successful starting point selection for two-mirror meniscus scanner optimization for laser machining

et al. 2019

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An algorithm for selecting the correct starting point for computer optimization of a two-mirror scanner with a meniscus lens is developed for use in laser machining. This algorithm performs joint analysis of aplanatism condition fulfillment and the field characteristics of the ghosts reflected from the meniscus surfaces back into the scanner mirror space. For integrity, all equations and estimates are given with respect to a major parameter: the curvature of the input surface. The second powerful tool for the optimization is the distance from the meniscus to the scanning mirrors, though its applicability is significantly limited by design considerations. Several scanner variants used to perform basic laser machining processes at various power levels are considered in detail. It is found that, for a fixed output numerical aperture, compacting the scanner always improves its optical performance. In general, compacting is an alternative to using scanners in systems with high-power laser sources. The results of this work are valid for any optical material and wavelength and are particularly relevant for systems based on CO 2 lasers, in which such scanners remain widely used.

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Section: Spontaneous and Optimized Aplanatizationmentioning

confidence: 99%

Section: Selection Of Starting Point For Optimization Ofmentioning

confidence: 99%

Section: Selection Of Starting Point For Optimization Ofmentioning

confidence: 99%

Section: Selection Of Starting Point For Optimization Ofmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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