نتایج جستجو برای: incoherent light

تعداد نتایج: 403365  

2016
Siobhan Maeve Tobin

One can locate incoherent sources of light even when they are very close together within an error bound. This thesis contributes to knowledge by presenting progress towards experimentally realising the super-resolution of two incoherent point sources of light, using Fisher information gleaned through image-inversion interferometry measurements. The diffraction limit has been a limiting construc...

Journal: :Optics letters 1985
G Sirat D Psaltis

A new method for recording holograms using incoherent light is described. The method is based on optical propagation through birefringent crystals. Optical methods for the reconstruction of such a hologram are also presented.

1991
Joseph Rosen Mordechai Segev

Optical image processing can derive significant benefits from the introduction of interferometric methods. The use of a shearing interferometer to yield the cosine Fourier transform of an object illuminated by spatially incoherent light is well known.'2 Other applications of the same interferometer include the sine transform'and the Hartley transform (HT) in coherent6'7 and incoherent8 illumina...

2010
Anthony J. Accardi

The research communities, technologies, and tools for image formation are diverse. On the one hand, computer vision and graphics researchers analyze incoherent light using coarse geometric approximations from optics. On the other hand, array signal processing and acoustics researchers analyze coherent sound waves using stochastic estimation theory and diffraction formulas from physics. The abil...

2013
Roy Kelner Joseph Rosen

Recent noteworthy advancements in the field of incoherent digital holography (the production of 3D images) include optical scanning holography and Fresnel incoherent correlation holography (FINCH) techniques.1, 2 The latter acts as a single channel incoherent interferometer (a device that splits light into two beams and recombines them to produce an interference pattern) and does not require an...

2017
Alessandro Martella Mauro Raichi

The High Power Pulsed Light™ [HPPL™] and Incoherent Fast Light™ technologies [IFL™, Novavision Group S.p.A., 20826 Misinto (MB), Italy] are recent innovations in the field of unwanted hair removal with intense pulsed light devices. IFL™ is a further improvement over the already advanced characteristics of the HPPL™ technology. A selection of photoepilation case histories with the HPPL™ and IFL™...

2017
Sébastien Hartmann Wolfgang Elsäßer

Initially, ghost imaging (GI) was demonstrated with entangled light from parametric down conversion. Later, classical light sources were introduced with the development of thermal light GI concepts. State-of-the-art classical GI light sources rely either on complex combinations of coherent light with spatially randomizing optical elements or on incoherent lamps with monochromating optics, howev...

In this paper propagation of combined laser beam through atmosphere is investigated. Laser beam is combined via lens array arrangement. Turbulence is considered as an affecting factor of atmosphere and its effects on transverse coherence length (Fried parameter), peak intensity, propagation efficiency, and spot size of the laser beam is investigated. Coherent and incoherent combined beam are co...

Journal: :Applied physics letters 2012
Ivo M Vellekoop Meng Cui Changhuei Yang

We demonstrate a method for phase conjugating fluorescence. Our method, called reference free digital optical phase conjugation, can conjugate extremely weak, incoherent optical signals. It was used to phase conjugate fluorescent light originating from a bead covered with 0.5 mm of light-scattering tissue. The phase conjugated beam refocuses onto the bead and causes a local increase of over two...

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