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The Green Book's motto, displayed on the front cover, urged black travelers to "Carry your Green Book with you – You may need it". [35] The 1949 edition included a quote from Mark Twain : "Travel is fatal to prejudice", inverting Twain's original meaning; as Cotten Seiler puts it, "here it was the visited, rather than the visitors, who would ...
The emitters are usually lasers, making what is termed a laser dazzler. Most of the contemporary systems can be carried by a person, and operate in either the red (a laser diode) or green (a diode-pumped solid-state laser, DPSS) areas of the electromagnetic spectrum. The green laser is chosen for its unique ability to react with the human eye. [5]
English: The Green Book was a travel guide published between 1936 and 1966 that listed hotels, restaurants, bars, gas stations, etc. where Black travelers would be welcome. 21 volumes, 1937 - 1964. According to legal research done by NYPL staff, those 21 volumes have no known US copyright restrictions, and can be used and reused freely.
The first laser, invented by Theodore Maiman in May 1960. Nd:YAG laser: 1.064 μm, (1.32 μm) Flashlamp, laser diode: Material processing, rangefinding, laser target designation, surgery, tattoo removal, hair removal, research, pumping other lasers (combined with frequency doubling to produce a green 532 nm beam). One of the most common high ...
Red (635 nm), blueish violet (445 nm), and green (520 nm) laser pointers. A laser pointer or laser pen is a (typically battery-powered) handheld device that uses a laser diode to emit a narrow low-power visible laser beam (i.e. coherent light) to highlight something of interest with a small bright colored spot.
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It is available online as a free resource. An earlier version of the encyclopedia appeared as a two-volume book. [2] As of March 2024, the online version of the encyclopedia contains 1043 articles. Since 2012, the encyclopedia is closely interlinked with the RP Photonics Buyer's Guide, a large directory of photonics product suppliers. [3]
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