Diffraction and signal processing experiments with a liquid crystal microdisplay

Martínez, José Luis; Moreno, Ignacio; Ahouzi, Esmail

doi:10.1088/0143-0807/27/5/021

Cited by 9 publications

(17 citation statements)

References 12 publications

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“…This amplitude modulation can be used to create on-demand masks and diffraction elements. We note that phase-only modulation 8 has been reported to yield greater diffraction efficiency. However, for the purposes of this paper, we use the simpler amplitude modulation setup, though we consider the possibility of phase-only modulation in Sec.…”

Section: Procedures and Experimental Setupmentioning

confidence: 70%

A low-cost spatial light modulator for use in undergraduate and graduate optics labs

Huang

Timmers

Roberts

et al. 2012

American Journal of Physics

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Spatial light modulators (SLMs) are a versatile tool for teaching optics, but the cost associated with an SLM setup prevents its adoption in many undergraduate and graduate optics labs. We describe a simple method for creating a low-cost SLM by extracting components from a commercial LCD projector. We demonstrate the pedagogical applications of this SLM design by providing examples of its use in teaching diffraction and interference phenomena. We also discuss an SLM's potential as a research tool in graduate labs. In particular, we demonstrate its use in holography and in the generation of optical vortices.

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Section: Procedures and Experimental Setupmentioning

confidence: 70%

A low-cost spatial light modulator for use in undergraduate and graduate optics labs

Huang

Timmers

Roberts

et al. 2012

American Journal of Physics

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“…LC devices have been used as programmable diffractive screens 10 , and also for pedagogical demonstrations 6 . As an example, we will show the change in the vanishing diffraction orders as the fill factor changes.…”

Section: Experimental Demonstrationmentioning

confidence: 99%

“…Additionally, the recent advent of liquid crystal technology allows the realization of programmable phase-only gratings 6 . In this work we also show how to extend the proposed phasor analysis to binary phaseonly diffraction gratings.…”

Section: Introductionmentioning

confidence: 99%

Teaching diffraction gratings by means of a phasor analysis

Sánchez-López¹,

Moreno²,

Martínez-García³

2009

Education and Training in Optics and Photonics

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Diffraction gratings play a very important educational role in describing wave properties of light. In this work we present a simple phasor technique to fully describe binary amplitude diffraction gratings with different slit widths relative to the grating period, as well as binary phase gratings with different phase shift. This analysis, which is directly derived from the Huygens principle, introduces a slit phasor to account for the diffracted orders relative intensity, and a grating phasor that accounts for the grating's resolving power. The proposed phasor technique is mathematically equivalent to the Fourier transform calculation of the diffraction orders amplitude, and it can be useful to explain binary diffraction gratings in a simple manner in introductory physics courses. Experimental results probing this theoretical analysis are included with the use of a liquid crystal display.

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“…On a completely different context, liquid-crystal displays working as electronically addressed spatial light modulators (SLM) have been widely used to generate programmable diffractive lenses (DL) to focus continuous wave laser radiation, even monochromatic [13] or polychromatic [14]. Also, array of lenses have been codified to implement a programmable SHWS [15].…”

Section: Introductionmentioning

confidence: 99%

Fresnel phase retrieval method using an annular lens array on an SLM

et al. 2014

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Cita bibliográfica / Cita bibliogràfica (ISO 690):LORIOT, V.; MENDOZA YERO, O.; PÉREZ VIZCAÍNO, J., MÍNGUEZ VEGA, G.; LANCIS SÁEZ, J.; DE NALDA, R.; BAÑARES, L. Fresnel phase retrieval method using an annular lens array on an SLM. Applied Physics B-Lasers and Optics v. 117, n. 1 (2014) Abstract Wavefront aberrations play a major role when focusing an ultrashort laser pulse to a high quality focal spot. Here, we report a novel method to measure and correct wavefront aberrations of a 30 femtosecond pulsed laser beam. The equipment is simple, as the method only requires a programmable liquid crystal spatial light modulator and a CCD camera. Wavefront retrieval is based on pupil segmentation, which allows us to determine the local phase that minimizes focusing errors due to wavefront aberration. Our method provide accurate results even when implemented with a low dynamic range cameras and polychromatic beams. Finally, the retrieved phase is added to a diffractive lens codified onto the spatial light modulator to experimentally demonstrate nearly diffraction-limited femtosecond beam focusing without refractive components.

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Diffraction and signal processing experiments with a liquid crystal microdisplay

Cited by 9 publications

References 12 publications

A low-cost spatial light modulator for use in undergraduate and graduate optics labs

A low-cost spatial light modulator for use in undergraduate and graduate optics labs

Teaching diffraction gratings by means of a phasor analysis

Fresnel phase retrieval method using an annular lens array on an SLM

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