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pro vyhledávání: '"K. J. Snell"'
Publikováno v:
Optical Society of America Annual Meeting.
Room temperature, tunable cw operation of a Cr:Forsterite laser has been obtained by using Nd:YAG laser pumping. A 10 mm long, 3 mm diameter, AR-coated Cr:Forsterite rod (Mediscience Technology, Inc.) was longitudinally pumped in a 10.4 cm long hemis
Publikováno v:
Optical Society of America Annual Meeting.
In the year 1880, Alexander Graham Bell patented a device with which a human voice could be transmitted by using a beam of intensity modulated light. He considered this instrument, the photophone, to be his greatest invention, “…even greater than
Publikováno v:
Optics and Photonics News. 4:20
In 1880, Alexander Graham Bell and his assistant, Sumner Tainter, unveiled a dramatic advance in optical communication technology, which they called “the photophone.” Without the benefit of lasers or modern detectors, the photophone could transmi