エルビウムをドープしたコアを持つ石英系光ファイバーを用いて、光を直接増幅する装置。光ファイバー内では誘導放射により光が増幅されます。EDFAに微弱な光信号が入射すると、信号光と同じ波長で光増幅が行われます。1.55 μm帯の長距離光ファイバー通信用の光増幅器として広く使用されています。
電子が、真空中で1 Vの電位差で加速されるときに得られるエネルギー。一般に素粒子・原子核・原子・分子などのエネルギーを表す単位として使われます。
1 eV = 1.602⋅10−19J
E検出器は、高エネルギー粒子の飛程に対して十分厚く、粒子の全エネルギー検出を目的とする検出器です。これに対してΔE検出器は、検出粒子の透過に対して十分薄く、粒子の比エネルギー損失を検出します。ΔE検出器とE検出器を組み合わせた、いわゆるΔE-E検出器は、粒子識別に有効な手段となります。
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