Frequency measurement of FIR laser lines of metrological and astrophysical interest

N. Ioli, A. Moretti, D. Pereira, F. Strumia
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引用次数: 1

Abstract

The optically pumped FIR lasers are the most convenient sources of CW radiation in the 1 THz to 6 THz region. The frequency stability and reproducibility (a few parts in 107) makes the FIR lasers a source suitable as a local oscillator for high sensitivity heterodyne spectrometers of astrophysical interest, and as a stable oscillator for Stark and Zeeman intracavity spectroscopy. Moreover the fine structure atomic transitions in the far infrared have a considerable practical interest. As an example, the fine structure transitions between the metastable triplet levels 3P2, 3P1, 3P0 of Magnesium and Calcium, at 0.6, 1.2, 1.5, and 3.1 THz respectively, are of relevant metrological interest, because they can be used as a reference for a new kind of absolute atomic frequency standards [1,2]; while the N+3P23P1 transition, which has recently been measured in the laboratory by Cooksy et al. [3], is of particular interest from an astronomical point of view. The discovery of this transition in the interstellar medium seems to be possible, at least in principle.
具有计量学和天体物理学意义的FIR激光线频率测量
光泵浦FIR激光器是在1thz到6thz范围内最方便的连续辐射源。频率稳定性和可重复性(107中的几个部分)使FIR激光器适合作为天体物理兴趣的高灵敏度外差光谱仪的本地振荡器,以及Stark和Zeeman腔内光谱的稳定振荡器。此外,远红外精细结构原子跃迁具有相当大的实际意义。例如,镁和钙的亚稳三重态能级3P2, 3P1, 3P0分别在0.6,1.2,1.5和3.1太赫兹处的精细结构跃迁具有相关的计量意义,因为它们可以作为一种新的绝对原子频率标准的参考[1,2];而最近由Cooksy等人[3]在实验室测量的N+3P2 - 3P1跃迁,从天文学的角度来看是特别有趣的。在星际介质中发现这种转变似乎是可能的,至少在原则上是可能的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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