Diffractive array optics tuned by rotation

Grewe, Adrian; Feßer, Patrick; Sinzinger, Stefan

doi:10.1364/ao.56.000a89

Cited by 24 publications

(6 citation statements)

References 32 publications

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“…Inspired by Lohmann contribution to varifocal optics [6], as well as by Dyson grating descriptions [7] and Bryngdahl contribution to nonconventional interferograms [8], some of us proposed the use of a pair of helical phase masks for generating a large family set of refractive focalizers [9][10][11]. For diffractive focalizers see the work of Bernet et al [12] and that Grewe et al [13,14].…”

Section: Tuning Optical Path Difference: Phase Conjugated Pairsmentioning

confidence: 99%

Tunable focalizers: phase conjugate pairs

Ojeda‐Castañeda

Gómez-Sarabia

2019

Fourth International Conference on Applications of Optics and Photonics

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We discuss the use of pairs of optical masks for setting tunable optical focalizers and for implementing controllable absorption masks. For phase-only masks, one element of a given pair has a complex amplitude transmittance that is equal to the complex conjugate of the other element. For the absorption masks, we use a suitable attenuation offset. Then, from the attenuation offset value, one element has the opposite absorption profile that the other element. These methods are useful for generating varifocal lenses, governable prisms, tunable axicons, controllable axilenses, for tuning field depth, and for controlling Super Gaussian beams.

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Section: Tuning Optical Path Difference: Phase Conjugated Pairsmentioning

confidence: 99%

Tunable focalizers: phase conjugate pairs

Ojeda‐Castañeda

Gómez-Sarabia

2019

Fourth International Conference on Applications of Optics and Photonics

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“…These lenses consist of two diffractive phase elements that change the resulting focal length by being translated or rotated relative to each other and perpendicular to the optical axis 12 – 18 Although this requires installation space for precise motion of the optical elements, typical miniaturized applications usually offer at least one direction perpendicularly to the optical axis, where installation space is less critical. This is particularly true for smartphone camera lenses, where the thickness of the device usually forms the most critical dimension and installation space in other directions is slightly more relaxed.…”

Section: Introductionmentioning

confidence: 99%

Diffractive Alvarez-Lohmann lenses for correcting aberrations of tunable membrane lenses

Lenk

Sinzinger

2023

Opt. Eng.

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Focus-tunable lenses, e.g., liquid filled membrane lenses (MLs), have found increasingly widespread application in optical systems. If a large refractive power range is to be used, the correction of chromatic aberrations is particularly challenging: a group containing a single ML cannot be corrected over the whole refractive power range. In analogy to hybrid achromats for lenses with constant focal lengths, we present the combination of an ML and a diffractive Alvarez-Lohmann-lens (ALL) for the compensation of axial color over a large refractive power range. In contrast to the combination of multiple MLs, this does not increase the axial length of the system significantly. At the same time, the flexible adaption of the phase function of the diffractive ALL can reduce spherical aberration over the whole focal range. Design examples with ray-tracing and wave-optical simulations demonstrate the performance of the resulting hybrid tunable element. Experimental data from fabricated sample lenses provide a proof of principle.

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“…Tuneable lenses offer the possibility of changing their focal length without elements moving along the optical axis (e.g. [2] [3] [4] [5]). Therefore, no additional installation space is needed to allow for such a longitudinal movement.…”

Section: Introductionmentioning

confidence: 99%

Zoom systems with tuneable lenses and linear lens movements

Lenk

Mitschunas

Sinzinger

2019

J. Eur. Opt. Soc.-Rapid Publ.

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Background: Classical zoom lenses are based on movements of sub-modules along the optical axis. Generally, a constant image plane position requires at least one nonlinear sub-module movement. This nonlinearity poses a challenge for the mechanical implementation. Tuneable lenses can change their focal length without moving along the optical axis. This offers the possibility of small system lengths. Since the focal range of tuneable lenses with significant aperture diameters is still limited, the use of tuneable optics in zoom lenses is usually restricted to miniaturized applications. Methods: To solve the challenge of the nonlinear movement in classical zoom lenses and the limitations of tuneable lenses for macroscopic applications we propose a combination of both concepts. The resulting 'Hybrid Zoom Lens' involves linear movements of sub modules as well as changing the focal length of a tuneable lens. The movements of the sub-modules and the focal length tuning of the lens are already determined by the collinear layout of the zoom lens. Therefore, we focus on collinear considerations and develop a method that allows a targeted choice of specific collinear layouts for our 'Hybrid zoom lenses'. Results: Based on examples and an experimental setup we demonstrate the feasibility of our approach. We apply the proposed method to examples of classical zoom lenses and zoom lenses based exclusively on tuneable lenses. Thereby we are able to show possible advantages of our 'Hybrid zoom lenses' over these widespread system types. Conclusions: We demonstrate important collinear considerations for the integration of tuneable lenses into a zoom lens. We show that the combination of classical zoom lens concepts with tuneable lenses offers the possibility to reach smaller system lengths for macroscopic zoom lenses while requiring only a small focal tuning range of the tuneable lens.

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Diffractive array optics tuned by rotation

Cited by 24 publications

References 32 publications

Tunable focalizers: phase conjugate pairs

Tunable focalizers: phase conjugate pairs

Diffractive Alvarez-Lohmann lenses for correcting aberrations of tunable membrane lenses

Zoom systems with tuneable lenses and linear lens movements

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