History
A very early example of a raygun is the Heat-Ray featured in H. G. Wells' novel The War of the Worlds (1898). Science fiction during the 1920s described death rays. Early science fiction often described or depicted raygun beams making bright light and loud noise like lightning or large electric arcs. Nikola Tesla's attempts at developing directed-energy weapons encouraged the imagination of many writers.
Soon after the invention of lasers during 1960, such devices became briefly fashionable as a directed-energy weapon for science fiction stories. For instance, characters of the Lost in Space TV series (1965–1968) and of the Star Trek pilot episode "The Cage" (1964) carried handheld laser weapons.
By the late 1960s and 1970s, as the laser's limits as a weapon became evident, rayguns were dubbed "phasers" (for Star Trek), "blasters" (Star Wars), "pulse rifles", "plasma rifles" and so forth.
In his book Physics of the Impossible Michio Kaku used gamma ray bursts as an evidence to illustrate that extremely powerful rayguns like the one used to destroy a planet on Death Star in the Star Wars franchise do not violate known physical laws and theories. He further analyses the problem of rayguns' power sources.
Read more about this topic: Raygun
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