The principal spectroscopic and lasing characteristics of a Tm(15%) : KY(WO 4 ) 2 crystal were investigated. The transition cross sections, the luminescence quantum yield, and the lifetime and the nonlinear depopulation coefficient of the upper active state were also determined. The slope efficiency of lasing at the 1950 nm wavelength was 45%. The feasibility of tuning in the spectral range 18501 950 nm was demonstrated in principle. S N Bagaev, S M Vatnik, A P Maiorov, D V Plakushchev Institute of Laser Physics, Siberian Division of the Russian Academy of Sciences, prospekt akad. Lavrent'eva 13/3,
Morphological transformations occurring in the thymus and lymph nodes are studied in Wistar rats after irradiation of the thymus projection area and transcutaneous irradiation of peripheral blood with a low-energy helium-neon laser during a 7-day period. Irradiation of the thymus projection area stimulates lymphopoiesis in T-dependent zones of lymph nodes, while irradiation of peripheral blood increases lymph flow through lymph node parenchyma and activates B-dependent zones.
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