Optimization of the contrast ratio of a ferroelectric liquid crystal optical modulator

Martı́nez, Antonio; Beaudoin, Nicolas; Moreno, Ignacio; Velásquez, Pablo

doi:10.1088/1464-4258/8/11/013

Cited by 26 publications

(46 citation statements)

References 11 publications

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“…Since the integrating e ect of holography can tolerate moderate imperfections in the LCoS's phase atness, relatively low cost consumer projectors can be operated as binary phase modulators with the proper choice of illumination polarization [92] which is − °in our setup. The projector we used has an LCoS manufactured by Syndiant (model SYL2043) and has 800×600 pixels with a pitch of 9.4 µm [93].…”

Section: Mgpc Experiments With Pocket Projectorsmentioning

confidence: 99%

Light Shaping with Holography, GPC and Holo-GPC

Bañas¹,

Glückstad²

2017

Optical Data Processing and Storage

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Light shaping techniques based on phase-only modulation o er multiple advantages over amplitude modulation. This review examines and compares the merits of two phase modulation techniques; phase-only computer generated holography and Generalized Phase Contrast (GPC). Both techniques are brie y presented while recent developments in GPC will also be covered. Furthermore, novel hybrid schemes that inherit merits from both holography and GPC are also covered. In particular, our most recent technique coined "Holo-GPC" will be discussed in addition to earlier hybrid techniques. We will discuss how Holo-GPC utilizes the simplicity of GPC in forming well-de ned speckle-free shapes and the versatility of holography in distributing these shaped beams over an extended 3D volume. To conclude, we cite applications where the combined strengths of the two photon-e cient phase-only light shaping techniques open new possibilities.

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Section: Mgpc Experiments With Pocket Projectorsmentioning

confidence: 99%

Light Shaping with Holography, GPC and Holo-GPC

Bañas¹,

Glückstad²

2017

Optical Data Processing and Storage

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“…Moreover, FLC cells have a very fast response, allowing us to implement a polarimeter with high measurement rate (in our case, in the order of milliseconds). A FLC can be modeled as a linear retarder of fix retardance and two stable orientations for its fast axis, switchable when addressing a square electrical signal [34]. The FLC cells used in our set-up have a nominal retardance of λ/2 and λ/4 (FLC 1 and FLC 2 respectively in Fig.…”

Section: Imaging Stokes Polarimetermentioning

confidence: 99%

Polarization imaging with enhanced spatial resolution

Peinado

Lizana

Iemmi

et al. 2015

Optics Communications

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“…Figure 3(a)). This suggests that the LCoS device can act as a phase modulator when the incident polarization is at 45° [10].…”

Section: Pico-projector Lcos Device Operated As Binary-phase Spatial mentioning

confidence: 99%

Matched-filtering generalized phase contrast using LCoS pico-projectors for beam-forming

Bañas¹,

Palima²,

Glückstad³

2012

Opt. Express

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Abstract:We report on a new beam-forming system for generating high intensity programmable optical spikes using so-called matched-filtering Generalized Phase Contrast (mGPC) applying two consumer handheld picoprojectors. Such a system presents a low-cost alternative for optical trapping and manipulation, optical lattices and other beam-shaping applications usually implemented with high-end spatial light modulators. Portable picoprojectors based on liquid crystal on silicon (LCoS) devices are used as binary phase-only spatial light modulators by carefully setting the appropriate polarization of the laser illumination. The devices are subsequently placed into the object and Fourier plane of a standard 4f-setup according to the mGPC spatial filtering configuration. Having a reconfigurable spatial phase filter, instead of a fixed and fabricated one, allows the beam shaper to adapt to different input phase patterns suited for different requirements. Despite imperfections in these consumer picoprojectors, the mGPC approach tolerates phase aberrations that would have otherwise been hard to overcome by standard phase projection.

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Optimization of the contrast ratio of a ferroelectric liquid crystal optical modulator

Cited by 26 publications

References 11 publications

Light Shaping with Holography, GPC and Holo-GPC

Light Shaping with Holography, GPC and Holo-GPC

Polarization imaging with enhanced spatial resolution

Matched-filtering generalized phase contrast using LCoS pico-projectors for beam-forming

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