Geometrically superresolved lensless imaging using a spatial light modulator

Fixler, Ohad; Zalevsky, Zeev

doi:10.1364/ao.50.005662

Cited by 7 publications

(1 citation statement)

References 21 publications

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“…Intermediate planes between the imaging and conjugate planes can be thought of as a mixture of the image and conjugate planes. In addition to the two configurations described here, other systems can involve placing the SLM in a Fresnel plane or other plane [18] or omitting the lens entirely [19]. It is also possible to use multiple devices or multiple passes of the same device to achieve greater control over both amplitude and phase [20].…”

Section: Device Overview and Operationmentioning

confidence: 99%

OTSLM toolbox for Structured Light Methods

Lenton

Stilgoe

Nieminen

et al. 2020

Computer Physics Communications

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We present a new Matlab toolbox for generating phase and amplitude patterns for digital micro-mirror device (DMD) and liquid crystal (LC) based spatial light modulators (SLMs). This toolbox consists of a collection of algorithms commonly used for generating patterns for these devices with a focus on optical tweezers beam shaping applications. In addition to the algorithms provided, we have put together a range of user interfaces for simplifying the use of these patterns. The toolbox currently has functionality to generate patterns which can be saved as a image or displayed on a device/screen using the supplied interface. We have only implemented interfaces for the devices our group currently uses but we believe that extending the code we provide to other devices should be fairly straightforward. The range of algorithms included in the toolbox is not exhaustive. However, by making the toolbox open sources and available on GitHub we hope that other researchers working with these devices will contribute their patterns/algorithms to the toolbox. There are many algorithms for generating computer controlled holograms however the code and descriptions for these algorithms is often provided as supplementary material to research publications which use these methods, and in some cases only the description is provided without code to reproduce the pattern. Furthermore, implementation of these algorithms can be a time consuming task. Even for simple patterns with simple analytical expressions for the far-field phase or amplitude, such as the Laguerre-Gaussian and Hermite-Gaussian beams, time is often wasted by researchers having to re-implement and test these patterns. Existing libraries for generation of SLM patterns focus on specific tasks, methods of pattern generation, or target specific hardware. These libraries are not general purpose or easily modifiable for general use by researchers working with computer controlled holograms in fields such as beam shaping and optical tweezers. Solution method:We have assembled a toolbox containing many methods commonly used with these devices. The number of methods available makes assembling a complete toolbox impossible, instead we have focused on putting together a general collection of methods, in the form of an open source toolbox, with the hope that other researchers will contribute patterns/algorithms they use. The toolbox currently includes a range of simple and iterative methods for beam shaping and steering as well as some of the methods our group currently uses for SLM control, calibration, imaging and optical tweezers beam shaping. To make the tools we have developed easy to use, we have tried to maintain a consistent well documented interface to each of the functions and provided graphical user interfaces to many of the simpler functions enabling code-free pattern generation. Additional comments: Some of the features require the Optical Tweezers Toolbox [1], in particular, the non-paraxial beam visualisation and optimisation routines. Certain functions require components...

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Section: Device Overview and Operationmentioning

confidence: 99%

OTSLM toolbox for Structured Light Methods

Lenton

Stilgoe

Nieminen

et al. 2020

Computer Physics Communications

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Experimental validation of 2-D generalized geometric super resolved approach

Borkowski

Zalevsky

Cohen

et al. 2014

Optics Communications

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Fast testing of partial camera lenses based on a liquid crystal spatial light modulator

et al. 2022

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Today, there are strict requirements for the quality inspection of mobile phone cameras, as the design tolerance is getting critically tighter. In order to avoid unnecessary disposal of lens components when testing and assembling the complete cameras, testing the quality of each single lens group in advance before the final assembly is effective. However, as part of a whole camera, a single lens group cannot generate a sharp image independently; it needs to be combined with other elements in the testing system and assembled precisely. In order to address this challenge, we propose a fast testing method based on spatial light modulators (SLMs). By taking advantage of the programmable feature of the SLM, the assembly misalignments caused by fixing the lens group to be tested into the testing system are dynamically scanned and compensated at a fast speed. A design criterion of the phase map pattern to be loaded on the SLM is also verified by simulation and is applied on the testing system. In this way, the proposed method significantly reduces the positioning requirement of the lens under test, and thus improves efficiency. The passed yield of tested lens groups reaches 92.6%.

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Geometrically superresolved lensless imaging using a spatial light modulator

Cited by 7 publications

References 21 publications

OTSLM toolbox for Structured Light Methods

OTSLM toolbox for Structured Light Methods

Experimental validation of 2-D generalized geometric super resolved approach

Fast testing of partial camera lenses based on a liquid crystal spatial light modulator

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