General algorithm to optimize the diffraction efficiency of a phase-type spatial light modulator

Cibula, Matthew A.; McIntyre, David

doi:10.1364/ol.38.002767

Cited by 11 publications

(5 citation statements)

References 8 publications

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“…SLM pixel count also affects the diffraction efficiency of each steered beam. Looking at the simplest case of a single spot steered by a non-binary phase ramp, its 1 st -order diffraction efficiency 𝜂 depends on Z, the number of phase pixels per ramp period, as follows 10 :…”

Section: Pixel Countmentioning

confidence: 99%

Designing a new spatial light modulator for holographic photostimulation

Shane

McKnight

Hill

et al. 2019

Optical Trapping and Optical Micromanipulation XVI

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Driven by the demands for speed and field of view in the holographic photostimulation community, we designed, built, and tested a liquid crystal on silicon (LCoS) spatial light modulator (SLM) with a 1536x1536 square pixel array and high-voltage LC drive. We discuss some of the engineering work that made the MacroSLM possible, including the custom FPGA board for handling huge data rates, the large pixel size for minimizing rolloff and crosstalk, and the temperature control to handle heating effects from the high-voltage controls and high-power laser illumination. We also designed an FPGA implementation of the overdrive method for increasing liquid crystal switching speed, allowing us to overcome the significant data bottlenecks that limit frame rates for large arrays. We demonstrate 500 Hz hologram-tohologram speed at 1064 nm operating wavelength, and discuss the new science that these speeds and array sizes have enabled.

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Section: Pixel Countmentioning

confidence: 99%

Designing a new spatial light modulator for holographic photostimulation

Shane

McKnight

Hill

et al. 2019

Optical Trapping and Optical Micromanipulation XVI

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“…This is a widely studied problem in diffractive optics. For instance, the relation between the first order diffraction efficiency (𝜂) of a grating profile and its phase error is expressed as [45]:…”

Section: F Phase Error Induced Lossmentioning

confidence: 99%

Metasurfaces for Free-Space Coupling to Multicore Fibers

Oh,

Yang,

Marra

et al. 2024

J. Lightwave Technol.

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Space-division multiplexing (SDM) with multicore fibers (MCFs) is envisioned to overcome the capacity crunch in optical fiber communications. Within these systems, the coupling optics that connect single-mode fibers (SMFs) to MCFs are key components in achieving high data transfer rates. Designing a compact and scalable coupler with low loss and crosstalk is a continuing challenge. Here, we introduce a metasurface-based free-space coupler that can be designed for any input array of SMFs to a MCF with arbitrary core layout. An inverse design techniqueadjoint methodoptimizes the metasurface phase profiles to maximize the overlap of the output fields to the MCF modes at each core position. As proof-of-concepts, we fabricated two types of 4-core couplers for MCFs with linear and square core arrays. The measured insertion losses were as low as 1.2 dB and the worst-case crosstalk was less than -40.1 dB in the O-band (1260-1360 nm). Owing to its foundry-compatible fabrication, this coupler design could facilitate the widespread deployment of SDM based on MCFs. Index Terms-metasurface, multicore fiber (MCF), spacedivision multiplexing (SDM), coupler, fan-in and fan-out (FIFO) I. INTRODUCTIONPTICAL fibers are the foundation of communication systems today. Single-mode fibers (SMFs) have enabled high data transfer rates thanks to a variety of multiplexing techniques that encode information onto the dimensions of light, namely, its amplitude, phase, polarization, wavelength, and space. The first four dimensions of light are widely utilized in today's SMF-based systems and are expected to be exhausted in the near future. With current data demands increasing by an order of magnitude every four years [1], the impending "capacity crunch" has made space-division multiplexing (SDM), that is using the spatial degree of freedom of light, an active area of research over the past decade [2][3][4][5][6][7]. Multicore fiber (MCF) is a promising candidate for enabling SDM by parallelizing signal transmission through each of its cores [8][9][10][11]. However, backward compatibility with existing SMF-Manuscript received xx.

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“…3.3.1 provides complete sets of a m . As a final note in this section, we comment on the precision of the OAM spectrum, which highly depends on the conversion efficiency and its uniformity for various OAM [2,14,44]. For example, the spatial filtering of the TEM 00 component is based on the difference between the spatial intensity profiles of TEM 00 and LG beams.…”

Section: Oam Resolved Spectroscopy Based On Mode Conversionmentioning

confidence: 99%

Laser Spectroscopy Using Topological Light Beams

Toda

Morita

2014

Progress in Nanophotonics 3

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Simplifications of systems are important for understanding their universal and/or intrinsic properties. Topology is one of the key concepts of such procedures, which focuses simply on the connectivity of the system to clarify the essential aspects of the geometric structures. To date, this concept has been extended to the field of physics, especially to the condensed matter physics and materials science. For example, topological defects have been observed in various materials, such as liquid crystals, superconductors, and electron gas systems in semiconductors. More recently, photoexcitations to some specific materials (mainly semiconductor nanostructures) have also revealed formation of topological defects. On the other hand, optical field itself includes a topological character, which has been well known as "optical or polarization vortex", "twisted light", and "helical or Laguerre-Gauss light" beams. These topological light beams exhibit spiral (spatial) variations of the phase (polarization) producing phase (polarization) singularities on the wavefront, which can be regarded as topological defects (screw dislocations). Therefore, we have possibilities to evaluate the topological aspects of material system on the interactions with topological light beams. However, the question arises: does it make any sense to apply the topological concept to the laser spectroscopy? The purpose of this chapter is to answer the question by introducing our recent research on this topic. Experimental results will be presented and discussed in terms of topological order of electrons. The chapter begins with the basics of topological light beams together with their important properties for laser spectroscopy (Sect. 3.1). Both the historical background and the overview of applications will also be introduced. In Sects. 3.2 and 3.3, we present several techniques for generating and evaluating the topological light beams, which are useful and needed in the experimental sections. We also discuss their advantages and drawbacks. In Sects. 3.4 and 3.5, we present our experimental results on

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General algorithm to optimize the diffraction efficiency of a phase-type spatial light modulator

Cited by 11 publications

References 8 publications

Designing a new spatial light modulator for holographic photostimulation

Designing a new spatial light modulator for holographic photostimulation

Metasurfaces for Free-Space Coupling to Multicore Fibers

Laser Spectroscopy Using Topological Light Beams

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