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Frank DeFreitas
Frank DeFreitas (born January 1, 1956, in Camden, New Jersey) is the maintainer of the website HoloWorld, aimed at amateur holographers, and author of ''Shoebox Holography''. He instructs people new to holography how to make simple holograms, for example by using a laser pointer. He started working on holography in 1983 with no formal training in science. He is a 2007 recipient of the International Holography Fund (IHF) grant award program, for the documentation of creative holographic artists through internet broadcasting and has provided laser and holography educational programs for schools, ranging from elementary to university level. He hosts an +, ''HoloTalk'' and has recently begun publishing a free companion e-zine An online magazine is a magazine published on the Internet, through bulletin board systems and other forms of public computer networks. One of the first magazines to convert from a print magazine format to being online only was the computer mag .... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Camden, New Jersey
Camden is a city in and the county seat of Camden County, in the U.S. state of New Jersey. Camden is part of the Delaware Valley metropolitan area and is located directly across the Delaware River from Philadelphia, Pennsylvania. At the 2020 U.S. census, the city had a population of 71,791.Camden city, Camden County, New Jersey . Accessed April 26, 2022. The 's [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holography
Holography is a technique that enables a wavefront to be recorded and later re-constructed. Holography is best known as a method of generating real three-dimensional images, but it also has a wide range of other applications. In principle, it is possible to make a hologram for any type of wave. A hologram is made by superimposing a second wavefront (normally called the reference beam) on the wavefront of interest, thereby generating an interference pattern which is recorded on a physical medium. When only the second wavefront illuminates the interference pattern, it is diffracted to recreate the original wavefront. Holograms can also be computer-generated by modelling the two wavefronts and adding them together digitally. The resulting digital image is then printed onto a suitable mask or film and illuminated by a suitable source to reconstruct the wavefront of interest. Overview and history The Hungarian- British physicist Dennis Gabor (in Hungarian: ''Gábor Déne ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Laser Pointer
A laser pointer or laser pen is a small handheld device with a power source (usually a battery) and a laser diode emitting a very narrow coherent low-powered laser beam of visible light, intended to be used to highlight something of interest by illuminating it with a small bright spot of colored light. The small width of the beam and low power of typical laser pointers make the beam itself invisible in a clean atmosphere, only showing a point of light when striking an opaque surface. Laser pointers can project a visible beam via scattering from dust particles or water droplets along the beam path. Higher-power and higher-frequency green or blue lasers may produce a beam visible even in clean air because of Rayleigh scattering from air molecules, especially when viewed in moderately-to-dimly lit conditions. The intensity of such scattering increases when these beams are viewed from angles near the beam axis. Such pointers, particularly in the green-light output range, are used a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
