位置分解能は、(ノイズ電流／信号光電流)× 抵抗長で規定されます。 信号光電流は入射光量に比例するため、位置分解能は入射光量が多いほど向上します。ただし、過度の入射光量は飽和の原因になりますので、PSDが飽和しない範囲で入射光量を設定する必要があります。
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