Tailoring the depth of focus for optical imaging systems using a Fourier transform approach

Self Cite

Abstract:We report the first observation of accelerating parabolic beams. These accelerating parabolic beams are similar to the Airy beams because they exhibit the unusual ability to remain diffraction-free while having a quadratic transverse shift during propagation. The amplitude and phase masks required to generate these beams are encoded onto a single liquid crystal display. Experimental results agree well with theory.

Section: Methodsmentioning

confidence: 99%

“…Amplitude information is then encoded by spatially modulating the phase pattern with the amplitude portion of the desired pattern [9,10,11],…”

Section: Methodsmentioning

confidence: 99%

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Observation of accelerating parabolic beams

Davis¹,

Mintry²,

Bandres³

et al. 2008

Self Cite

“…These filters are use in order to achieve depth of focus, achromatic system, diffractive superresolution elements, etc. [6][7][8][9][10]. The use of SLMs to implement diffractive optical elements (DOEs) has been reported to be a useful tool in real-time optical processing [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Real time modulable multifocality through annular optical elements

Pérez¹,

Espinosa²,

Illueca³

et al. 2008

We present and analyze new multifocal optical elements based on an annular distribution of the transmittance. These elements provide selectable number of foci and can be designed to work between two fixed positions or even to provide extended focal depth. The energy of the foci can be modulated through a single parameter that controls the area of each ring. In our study we analyze the quality of the peaks and also the limit number of foci that can be obtained. The properties shown by these elements make them usable in instrumental optics or in ophthalmic optics, as new intraocular implants, where multifocal elements are required. The implementation has been done on a twisted nematic spatial light modulator, thus allowing real time reconfiguration of the element.

“…Among these systems, we are most interested in single diffractive structures, which can be easily implemented in a spatial light modulator (SLM). In particular we will focus our work on two particular elements: Light Sword Optical Elements (LSOE) and Fresnel Axicons (FA) Optical properties of these elements are widely known [1][2][3]11,15] and their performance has been optimized in several ways [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Three dimensional analysis of chromatic aberration in diffractive elements with extended depth of focus

Mas¹,

Espinosa²,

Pérez³

et al. 2007

Abstract:The paper presents the polychromatic analysis of two diffractive optical elements with extended depth of focus: the linear axicon and the light sword optical element. Chromatic aberration produces axial displacement of the focal segment line. Thus, we explore the possibility of extending the focal depth of these elements to permit superposition of the chromatic foci. In the case of an axicon, we achieve an achromatic zone where focusing is produced. In the case of the light sword element, we show that the focusing segment is out of axis. Therefore a superposition of colors is produced, but not on axis overlapping. Instead, three colored and separated foci are simultaneously obtained in a single plane. Three dimensional structures of the propagated beams are analyzed in order to provide better understanding of the properties and applications of such elements.