ESA transfers images by laser between two satellites

TESAT’s advanced laser communication terminal technology transmits at 0.6 Gbps (...)

At the heart of each LCT on Sentinel-1A and Alphasat is a solid state Nd-doped YAG laser, which transmits light at a wavelength of 1064 nm. The laser is pumped by a space-qualified laser diode bench made by Ferdinand-Braun-Institut, Leibniz Institut für Höchstfrequenzetechnik (FBH), which is a centre of excellence for III-V compound semiconductors. (...)
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Source: Compound Semiconductor, 04.12.2014