Encoding amplitude and phase information onto a binary phase-only spatial light modulator

Davis, Jeffrey A.; Valadéz, Keevin Olea; Cottrell, Don M.

doi:10.1364/ao.42.002003

Cited by 52 publications

(21 citation statements)

References 20 publications

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“…This results into a complex function, which needs to be encoded onto an electrically addressed binary SLM [a ferroelectric liquid-crystal device, with 256 × 256 resolution and pixel size of 15 × 15 µm, from Displaytech, U.S.A.] working in the reflection mode. The complex data so obtained were mapped into a binary amplitude function employing an encoding technique [38][39][40] . The encoded complex data was then displayed on the SLM for obtaining the optical Fourier transformation through the FT lens (f = 105 mm).…”

Section: Resultsmentioning

confidence: 99%

A hybrid digital-optical correlator for automatic target recognition

2007

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Detection of rotationally distorted targets is a challenging task in pattern recognition applications. Recently, we proposed and implemented a wavelet-modified maximum average correlation height (MACH) filter for in-plane and out-of-plane rotation invariance in hybrid digital-optical correlator architecture. Use of wavelet transform improved the performance of the MACH filter by reducing the number of filters required for identifying a rotated target and enhancing the correlation peak intensity significantly. The output of a hybrid digital-optical correlator contains two autocorrelation peaks and a strong dc. To capture a desired single autocorrelation peak a chirp function with the wavelet-modified MACH filter was used. The influence of perturbations in hybrid digital-optical correlator has also been studied. Perturbations include, the effect of occlusion on input target, the effect of additive and multiplicative noise and their combined effect on input target, and the effect of occlusion of product function to be optically processed for obtaining the correlation outputs. The present paper reviews investigations on the hybrid digital-optical correlation scheme with special reference to the work carried out at the Photonics Division, IRDE Dehradun.

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Section: Resultsmentioning

confidence: 99%

A hybrid digital-optical correlator for automatic target recognition

2007

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“…By composing many short fragments of varying depths next to one another, as illustrated in Fig. 2 beam with arbitrary amplitude distribution can be diffracted [17,18]. It is necessary for the amplitude of desired diffracted beam to change slowly compared to spatial period of the grating d so that various orders of diffraction can be separated by spatial filtering.…”

Section: Depth-modulated Gratingmentioning

confidence: 99%

Calibration of wavefront distortion in light modulator setup by Fourier analysis of multibeam interference

Leszczyński¹,

Wasilewski²

2016

J. Opt. Soc. Am. A

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We present a method to calibrate wavefront distortion of the spatial light modulator setup by registering far field images of several Gaussian beams diffracted off the modulator. The Fourier transform of resulting interference images reveals phase differences between typically 5 movable points on the modulator. Repeating this measurement yields wavefront surface. Next, the amplitude efficiency is calibrated be registering near field image. As a verification we produced a superposition of 7th and 8th Bessel beams with different phase velocities and observed their interference.

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“…[52][53][54][55][56]. However, minor work has been done to develop algorithms for the non-far-field range where Rayleigh-Sommerfeld (RS) or Fresnel diffraction models are valid, perhaps due to the difficulty in the involved analytical relations [57,58].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of three-dimensional light fields with binary spatial light modulators

2011

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Computation of a binary spatial light modulator (SLM) pattern that generates a desired light field is a challenging quantization problem for which several algorithms have been proposed, mainly for far-field or Fourier plane reconstructions. We study this problem assuming that the desired light field is synthesized within a volumetric region in the non-far-field range after free space propagation from the SLM plane. We use Fresnel and RayleighSommerfeld scalar diffraction theories for propagation of light. We show that, when the desired field is confined to a sufficiently narrow region of space, the ideal gray-level complex-valued SLM pattern generating it becomes sufficiently low pass (oversampled) so it can be successfully halftoned into a binary SLM pattern by solving two decoupled real-valued constrained halftoning problems. Our simulation results indicate that, when the synthesis region is considered, the binary SLM is indistinguishable from a lower resolution full complex gray-level SLM. In our approach, free space propagation related computations are done only once at the beginning, and the rest of the computation time is spent on carrying out standard image halftoning.

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Encoding amplitude and phase information onto a binary phase-only spatial light modulator

Cited by 52 publications

References 20 publications

A hybrid digital-optical correlator for automatic target recognition

A hybrid digital-optical correlator for automatic target recognition

Calibration of wavefront distortion in light modulator setup by Fourier analysis of multibeam interference

Synthesis of three-dimensional light fields with binary spatial light modulators

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