نتایج جستجو برای: diffractive optical element

تعداد نتایج: 468384  

Journal: :Journal of biomedical optics 2012
Lenny A Romero María S Millán Zbigniew Jaroszewicz Andrzej Kolodziejczyk

The aged human eye is commonly affected by presbyopia, and therefore, it gradually loses its capability to form images of objects placed at different distances. Extended depth of focus (EDOF) imaging elements can overcome this inability, despite the introduction of a certain amount of aberration. This paper evaluates the EDOF imaging performance of the so-called peacock eye phase diffractive el...

Journal: :Nanophotonics 2022

Abstract Permutation matrices form an important computational building block frequently used in various fields including, e.g., communications, information security, and data processing. Optical implementation of permutation operators with relatively large number input–output interconnections based on power-efficient, fast, compact platforms is highly desirable. Here, we present diffractive opt...

2003
J. F. Barrera C. A. Rodríguez

We make use of binary encoding of a phase wave front for the generation of diffractive elements. Binary encoding enables to introduce a constant phase shift between different diffraction orders. We describe the main features of phase wave front encoding and then suggest to apply them for a design of a diffractive alignment element. The proposed positioning tool is a modified version of the hype...

Journal: :Optics express 2007
Adam J Caley Martin J Thomson Jinsong Liu Andrew J Waddie Mohammad R Taghizadeh

We introduce a previously unreported laser cavity configuration, using a diffractive optical element (DOE) in place of the output coupler. Such a configuration allows the DOE to work both in reflection, as a mode shaping element, and in transmission as a beam shaper. Employing dual wavelength DOE optimization techniques and phase delays greater than 2pi, allows the two functions to be designed ...

2013
Xuemin Cheng Qun Hao Jianbo Hou Xiangping Li Jianshe Ma Min Gu

This paper introduces a compact optical information storage sensing system. Applications of this system include longitudinal surface plasmon resonance detection of gold nanorods with a single femtosecond laser in three-dimensional space as well as data storage. A diffractive optical element (DOE) is applied in the system to separate the recording-reading beam from the servo beam. This allows us...

Journal: :Optics letters 2005
Kimani C Toussaint Sungnam Park Justin E Jureller Norbert F Scherer

We present a novel approach to generating radially and azimuthally polarized vector beams that utilize an interferometer constructed from two identical diffractive optical elements. The measured polarization properties of four vector beam states and their phase relationships are in good agreement with theoretical expectations. This interferometer is passively phase stable and robust, making it ...

2010
Brendon O. Watson Volodymyr Nikolenko Roberto Araya Darcy S. Peterka Alan Woodruff Rafael Yuste

Two-photon microscopy is often performed at slow frame rates due to the need to serially scan all points in a field of view with a single laser beam. To overcome this problem, we have developed two optical methods that split and multiplex a laser beam across the sample. In the first method a diffractive optical element (DOE) generates a fixed number of beamlets that are scanned in parallel resu...

2001
Chang Chang Erik Anderson Patrick Naulleau Eric Gullikson Kenneth Goldberg David Attwood

The first direct measurement of the dispersive part of the refractive index is performed at extreme ultraviolet (EUV) wavelengths, where absorption is higher as compared with hard x-ray and visible wavelengths. A novel diffractive optical element, which combines the functions of a grating and a zoneplate, is fabricated following Fourier optical techniques and employed here for the first time at...

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