An equation for lifetime shortening is derived, which is used to determine readily the lifetime characteristics of He-Nelasers.
导出了加速寿命公式，利用该公式，可以快速地判定氦-氖激光管的寿命特征。
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This paper describes a phototypesetter with four scanning laser beams. There are four He-NeLasers and four acoustooptic modulators in the phototypesetter.