Multifacet holographic optical elements for wave front transformations

Case, Steven K.; Haugen, P. R.; Løkberg, Ole J.

doi:10.1364/ao.20.002670

Cited by 60 publications

(11 citation statements)

References 10 publications

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“…Other than GPC, examples include refractive mapping [27], phase plates [28,29] or di ractive optical elements (DOE) [30,31]. Refractive mapping redirects rays in a controlled manner such that the transformed output beam has a well-de ned wavefront.…”

Section: Light Shaping Techniquesmentioning

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: Light Shaping Techniquesmentioning

confidence: 99%

Light Shaping with Holography, GPC and Holo-GPC

Bañas¹,

Glückstad²

2017

Optical Data Processing and Storage

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“…Thus we cannot obtain the closed forms of the filter functions that minimize the error expression in Eq. (12). For this reason we obtain the filters by an iterative algorithm.…”

Section: Solution Of the Problemmentioning

confidence: 99%

“…Any linear system can be implemented optically with conventional approaches such as matrix-vectormultiplier architectures 11 or multifacet architectures, 12 but these are not space-bandwidth efficient. 13 In other words, to implement a given general linear transformation represented by an N ϫ N matrix, it is necessary to employ an optical system whose space-bandwidth product is N 2 .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of general linear systems with repeated filtering in consecutive fractional Fourier domains

Erden

Özaktaş

1998

J. Opt. Soc. Am. A

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The optical and digital implementations of general linear systems are costly. Through several examples we show that either exact realizations or useful approximations of these systems may be implemented in the form of repeated-filtering operations in consecutive fractional Fourier domains. These implementations are much cheaper than direct implementations of general linear systems. Thus we may significantly decrease the implementation costs of general linear systems with little or no decrease in performance by synthesizing them with the proposed repeated-filtering method.

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“…These include engineered diffusers, microlens arrays or homogenizers [5,6], refractive mapping [7], diffractive optical elements (DOE) [8,9] or phase plates [10,11]. Engineered diffusers, microlens arrays and homogenizers work similarly by sampling an incident beam as a collection of beamlets that are then redirected to form an output shape.…”

Section: Introductionmentioning

confidence: 99%

GPC light shaper for speckle-free one- and two-photon contiguous pattern excitation

Bañas¹,

Palima²,

Villangca³

et al. 2014

Opt. Express

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Generalized Phase Contrast (GPC) is an efficient method for generating speckle-free contiguous optical distributions useful in diverse applications such as static beam shaping, optical manipulation and recently, for excitation in two-photon optogenetics. To fully utilize typical Gaussian lasers in such applications, we analytically derive conditions for photon efficient light shaping with GPC. When combined with the conditions for optimal contrast developed in previous works, our analysis further simplifies GPC's implementation. The results of our analysis are applied to practical illumination shapes, such as a circle and different rectangles commonly used in industrial or commercial applications. We also show simple and efficient beam shaping of arbitrary shapes geared towards biophotonics research and other contemporary applications. Optimized GPC configurations consistently give ~84% efficiency and ~3x intensity gain. Assessment of the energy savings when comparing to conventional amplitude masking show that ~93% of typical energy losses are saved with optimized GPC configurations.

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Multifacet holographic optical elements for wave front transformations

Cited by 60 publications

References 10 publications

Light Shaping with Holography, GPC and Holo-GPC

Light Shaping with Holography, GPC and Holo-GPC

Synthesis of general linear systems with repeated filtering in consecutive fractional Fourier domains

GPC light shaper for speckle-free one- and two-photon contiguous pattern excitation

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