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A disk laser or active mirror (Fig.1) is a type of diode pumped solid-state laser characterized by a heat sink and laser output that are realized on opposite sides of a thin layer of active gain medium.〔(【引用サイトリンク】 url=http://www.rp-photonics.com/thin_disk_lasers.html )〕 Despite their name, disk lasers do not have to be circular; other shapes have also been tried. The thickness of the disk is considerably smaller than the laser beam diameter. The disk laser concepts allows very high average and peak powers〔http://www.ifsw.uni-stuttgart.de/artikel/art13_06.html?__locale=en〕 due to its large area leading to moderate power densities on the active material. ==Active mirrors and disk lasers== Initially, disk lasers were called ''active mirrors'', because the gain medium of a disk laser is essentially an optical mirror with reflection coefficient greater than unity. An active mirror is a thin disk-shaped double-pass optical amplifier. The first active mirrors were developed in the Laboratory for Laser Energetics (USA). Then, the concept was developed in various research groups, in particular, the University of Stuttgart (Germany) for Yb:doped glasses. In the ''disk laser'', the heat sink does not have to be transparent, so, it can be extremely efficient even with large transverse size of the device (Fig.1). The increase in size allows the power scaling to many kilowatts without significant modification of the design.〔 〕 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「Disk laser」の詳細全文を読む スポンサード リンク
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