Enhancement of efficiency in the use of light for cultivation of plants in controlled ecological systems

The problems of plant cultivation with the use of artificial lighting are related to energetics and, initially, to the lack of effective sources for photosynthesis, secondly to the necessity to supply a system with a considerable power in the form of light energy and to remove transformed thermal energy, and finally to economic considerations. These problems are solved by three ways: by the choice of effective radiation sources, design approaches, and technological methods of cultivation. Here we shall consider the first two ways

Paper Session II-B - The Possibility of Using Plants in Life-Support Systems During Long-Term Space Flights

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Tm3+-doped CW fiber laser based on a highly GeO2-doped dispersion-shifted fiber,”

Abstract: All-fiber Tm-laser with 55GeO 2 -45SiO 2 core, pumped at 1560 nm with 37% slope efficiency was demonstrated at 1862 nm. Four-wave mixing owing to a high nonlinearity and shifted to 1.87 µm zero-dispersion-wavelength has been observed

Fabrication of Bragg gratings in microstructured and step index Bi-SiO2 optical fibers using an ArF laser

An ArF excimer laser was used to fabricate Bragg gratings in fibers with Bi-SiO2 core and microstructured or F-doped claddings without fiber presensitization. Average and modulated refractive index changes of 2.7 x 10(-4) and 1.0 x 10(-4) were induced in pristine microstructured fiber while 1.0 x 10(-4) and 0.7 x 10(-4) were observed in the F-doped-cladding fiber. Fiber luminescence was also measured under 1064 nm pumping for both fibers. Photosensitivity and luminescence were compared to a Bi-Al2O3-SiO2 core optical fiber. (c) 2012 Optical Society of Americ