Yb ドープファイバー(YDF)を赤外光で励起すると,赤外の発光成分の他に,協同発光による緑色の発光成分が観測されることが知られている.このYDF からの発光を調べたところ,緑色発光成分とともに,青色の発光成分が観測された.この発光成分のスペクトルと励起強度依存性から,青色発光成分は高次の協同発光によるものだと考えられる.%Under infrared excitation, green luminescence emitted from Yb-doped optical fiber (YDF) is known as a cooperative luminescence. In this work, we observed a blue luminescence emitted from YDF, along with the green cooperated luminescence. Since the energy of the blue luminescence was located at the nearly threefold of infrared luminescence, we considered that blue luminescence is due to a higher-order cooperated luminescence related three excited ytterbium ions.
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