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A laser is constructed from three principal parts: *An energy source (usually referred to as the ''pump'' or ''pump source''), *A ''gain medium'' or ''laser medium'', and *Two or more mirrors that form an ''optical resonator''. ==Pump source== The ''pump source'' is the part that provides energy to the laser system. Examples of pump sources include electrical discharges, flashlamps, arc lamps, light from another laser, chemical reactions and even explosive devices. The type of pump source used principally depends on the ''gain medium'', and this also determines how the energy is transmitted to the medium. A helium–neon (HeNe) laser uses an electrical discharge in the helium-neon gas mixture, a Nd:YAG laser uses either light focused from a xenon flash lamp or diode lasers, and excimer lasers use a chemical reaction. 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「laser construction」の詳細全文を読む スポンサード リンク
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