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利用Zemax软件为线形离子阱囚禁199 Hg+实验设计了一套光学系统,该系统包括两部分,即光学激发系统和荧光收集系统。光学激发系统由202 Hg无极谱灯和激发透镜组组成。激发透镜组将202 Hg无极谱灯的直径为15mm的圆形面光源整形成23mm×4mm的矩形光去激发199 Hg+能级跃迁,从而使其辐射出荧光,再利用荧光收集系统去收集该荧光。荧光收集系统由收集透镜组、滤波片和光电倍增管组成。设计结果表明:该收集透镜组可以很好地将荧光发光面成像在直径为23mm的光电倍增管上,具有较高的荧光收集效率,约3%。经物理系统实验,结果表明,该光学系统满足实验要求且具有较高的信噪比,其值约为20。这为高性能线形199 Hg+微波频标的工程应用提供了基础。
An optical system was designed for linear ion trap implanted 199 Hg + experiments using Zemax software. The system consists of two parts, an optical excitation system and a fluorescence collection system. The optical excitation system consists of a 202 Hg spectrometer lamp and an excitation lens set. Excitation Lens Group A 202 Hg electrodeless toroidal 15 mm diameter circular surface light source was shaped into a 23 mm × 4 mm rectangular light de-excitation 199 Hg + level transition so that it fluoresces out and then collected using a fluorescence collection system . The fluorescence collection system consists of a collection lens set, a filter and a photomultiplier tube. The design results show that the collecting lens group can well image the fluorescence emitting surface on a 23mm diameter photomultiplier with high fluorescence collection efficiency of about 3%. The physical system experiments show that the optical system meets the experimental requirements and has a high signal to noise ratio, the value of about 20. This provides the basis for engineering applications of the high performance linear 199 Hg + microwave frequency standard.