Topic
Light field
About: Light field is a research topic. Over the lifetime, 5357 publications have been published within this topic receiving 87424 citations.
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Patent•
07 Feb 1997
TL;DR: In this paper, the authors present an LED light source for a machine vision system, which includes a plurality of LEDs each arranged in a base plate in a predetermined manner during manufacturing, and each LED is then securely mounted to the base plate with an ultravioletly curable adhesive to remain pointed in the predetermined manner.
Abstract: The present invention relates to an LED light source for a machine vision system. The light source includes a plurality of LEDs each arranged in a base plate in predetermined manner during manufacturing. Each LED is then securely mounted to the base plate with an ultravioletly curable adhesive to remain pointed in the predetermined manner. The light source also includes an optically efficient non-lambertain diffuser which receives light from each of the LEDs and breaks the light up to provide a uniform light field to illuminate an object under inspection.
34 citations
TL;DR: In this article, a conjugate gradient minimisation-based hologram calculation technique and a single phase-only spatial light modulator (SLM) were used to demonstrate simultaneous control of both the phase and amplitude of light.
Abstract: We demonstrate simultaneous control of both the phase and amplitude of light using a conjugate gradient minimisation-based hologram calculation technique and a single phase-only spatial light modulator (SLM). A cost function, which incorporates the inner product of the light field with a chosen target field within a defined measure region, is efficiently minimised to create high fidelity patterns in the Fourier plane of the SLM. A fidelity of F = 0.999997 is achieved for a pattern resembling an LG10 mode with a calculated light-usage efficiency of 41.5%. Possible applications of our method in optical trapping and ultracold atoms are presented and we show uncorrected experimental realisation of our patterns with F = 0.97 and 7.8% light efficiency.
34 citations
TL;DR: In this paper, the absorption line strength of electric-dipole-forbidden (magnetic dipole and electric quadrupole) transitions have been calculated in the evanescent light field that accompanies the total reflection of light.
Abstract: The absorption line strengths of electric-dipole-forbidden (magnetic dipole and electric quadrupole) transitions have been calculated in the evanescent light field that accompanies the total reflection of light. Owing to the complex wave and polarization vectors of the evanescent light, the apparent oscillator strength is enhanced from that in the propagating light and the enhancement for the electric quadrupole transition depends on the polarization vector of the incident light. Separation of the contribution from each component of the wave and polarization vectors is proposed with a magnetic-sublevel-resolved measurement for the $(s\text{\ensuremath{-}}d)$ electric quadrupole transition.
34 citations
TL;DR: In this article, a theory for the photophoretic motion of a small aerosol particle whose radius is much smaller than the wavelength of the light is derived, and the effects of the incomplete accommodation of the energy and momentum of the gas molecules in collisions with the surface of the particle are also taken into account.
Abstract: A theory is derived for the photophoretic motion of a small aerosol particle, whose radius is much smaller than the wavelength of the light. The radiation pressure is taken into account; the effects of the incomplete accommodation of the energy and momentum of the gas molecules in collisions with the surface of the particle are also taken into account.
34 citations
TL;DR: A fast Kerr phase gate in a room-temperature (85)Rb vapor is demonstrated using a Raman gain method where the probe wave travels "superluminally", demonstrating the capability of the system in information science and telecommunication applications.
Abstract: We demonstrate a fast Kerr phase gate in a room-temperature Rb-85 vapor using a Raman gain method where the probe wave travels "superluminally". Continuously variable, zero to pi radian nonlinear Kerr phase shifts of the probe wave relative to a reference wave have been observed at 333 K. We show rapid manipulation of digitally encoded probe waves using a digitally encoded phase-control light field, demonstrating the capability of the system in information science and telecommunication applications. DOI: 10.1103/PhysRevLett.110.113902
34 citations