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Transparencies can be printed using a variety of technologies. In the 1960s and 70s the GAF OZALID "projecto-viewfoil" used a diazo process to make a clear sheet framed in cardboard and protected by a rice paper cover. [1] In the 1980's laser printers or copiers could make foil sheets using standard xerographic processes. Specialist ...
Laser printing is an electrostatic digital printing process. It produces high-quality text and graphics (and moderate-quality photographs) by repeatedly passing a laser beam back and forth over a negatively charged cylinder called a "drum" to define a differentially charged image. [1]
Large laser elements made from transparent ceramics can be produced at a relatively low cost. These components are free of internal stress or intrinsic birefringence, and allow relatively large doping levels or optimized custom-designed doping profiles. This makes ceramic laser elements particularly important for high-energy lasers.
For instance, some kinds of glass, while transparent in the visual range, are largely opaque to ultraviolet light. More extreme frequency-dependence is visible in the absorption lines of cold gases. Opacity can be quantified in many ways; for example, see the article mathematical descriptions of opacity.
The zig-zag appearance of the photomask is because optical proximity correction was applied to it to create a better print. Lithographic photomasks are typically transparent fused silica plates covered with a pattern defined with a chromium (Cr) or Fe 2 O 3 metal absorbing film. [6] Photomasks are used at wavelengths of 365 nm, 248 nm, and 193 nm.
Model of a castle (0.2 mm x 0.3 mm x 0.4 mm) 3D-printed on a pencil tip via multiphoton lithography Multiphoton lithography (also known as direct laser lithography or direct laser writing) is similar to standard photolithography techniques; structuring is accomplished by illuminating negative-tone or positive-tone [jargon] photoresists via light of a well-defined wavelength.
The first laser printer was invented by Xerox PARC in the 1970s. Laser printers were introduced for the office and then home markets in subsequent years by IBM, Canon, Xerox, Apple, Hewlett-Packard and others. [28] Over the decades, quality and speed have increased as the price fall, and the once cutting-edge printing devices are now ubiquitous ...
Computer-developed presentations could be printed to a transparency with some laser printers, transferred to slides, or projected directly using LCD overhead projectors. Modern presentations are often displayed digitally using a video projector, computer monitor, or large-screen television.