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A non-mechanical, compact optical terminal equipped with a two-dimensional laser array is proposed. A laser beam is transmitted by selecting the laser pixel corresponding to the direction of the optical signal received from the counter terminal. The beams are not deflected by a mechanical mirror. Instead, they are turned on and off one after the other in accordance with the direction from which optical...
Ground-to-satellite laser communication experiments between the optical ground station located in Koganei, central Tokyo, and a low earth orbit (LEO) satellite were jointly performed by the Japan Aerospace Exploration Agency and the National Institute of Information and Communications Technology. In 18 trials during three non-consecutive months, the satellite was acquired and tracked 61 % of the time,...
Summary form only given. In this paper, a coherent narrowband tunable terahertz emission from an electron bunch is reported, transposing a technique well-known in nonlinear optics: interaction with laser pulses containing an internal modulation. The modulated pulses are produced from a titanium-sapphire laser using chirped pulse beating, and are focused on the electron beam, inside an undulator. The...
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