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A fiber disk laser is a fiber laser with transverse delivery of the pump light. They are characterized by the pump beam not being parallel to the active core of the optical fiber (as in a double-clad fiber), but directed to the coil of the fiber at an angle (usually, between 10 and 40 degrees). This allows use of the specific shape of the pump beam emitted by the laser diode, providing the efficient use of the pump. Fiber disk lasers should not be confused with the LaserDiscs (disk-shaped devices for storage and reading of information with laser beam) nor the disk laser or "active mirror", which is a laser with a thin active layer where the heat sink is realized in a direction opposite to that of propagation of the output beam. ==Realizations of fiber disk lasers== First disk lasers were developed in the Institute for Laser Science, Japan. Several realizations of fiber disk lasers were reported.〔 〕〔 〕〔 〕 The fiber disk laser is so named because the fiber is tightly coiled. Typically, no special feedback for the laser frequency is required, as the small reflection at end of the fiber is sufficient to provide efficient operation. In this case, both ends of the coiled fiber can be used as output. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Fiber disk laser」の詳細全文を読む スポンサード リンク
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