Lamb-dip spectroscopy of buffer-gas-cooled molecules
Lamb-dip spectroscopy of buffer-gas-cooled molecules
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DOI：
10.1364/optica.6.000436
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发表时间：
2019-04-20
期刊：
影响因子：
10.4
通讯作者：
Maddaloni, P.
中科院分区：
文献类型：
--
作者：
Di Sarno, V;Aiello, R.;Maddaloni, P.
如今，缓冲气体冷却代表了产生冷稳定分子的宝贵选择，无论是从实现量子简并的二次冷却/捕获策略还是复杂分子的基础研究来看。由此产生了建立一个专门的、越来越精确的光谱询问技术库的需求。在这里，我们展示了一个一般的方法，兰姆浸渍振转光谱的缓冲气体冷却的分子。通过将探测激光器耦合到围绕冷样品的高精细光学腔来实现所选分子跃迁的饱和强度。一个腔衰荡技术，然后实施进行饱和亚多普勒测量的缓冲（他）和分子气体流量的变化。作为一个例子，我们讨论了20 K乙炔样品中的（v（1）+ v（3））R（1）振转谱线。通过将探测激光器参考到Rb/GPS对接器，对应的线中心频率以及自身和外来（即，由于缓冲气体）碰撞加宽系数被绝对确定。我们的方法代表了一个重要的一步，发展一种新的方法来执行超精确的振转光谱在一个非常广泛的冷分子。在这方面，我们最后讨论了一些相关的升级正在进行的实验装置，大大提高最终的光谱性能。(C)根据OSA开放获取出版协议的条款，2019年美国光学学会
Nowadays, buffer-gas cooling represents an invaluable option to produce cold stable molecules, both in view of secondary cooling/trapping strategies towards the achievement of quantum degeneracy and for fundamental studies of complex molecules. From this follows a demand to establish a pool of specialized, increasingly precise spectroscopic interrogation techniques. Here, we demonstrate a general approach to Lamb-dip ro-vibrational spectroscopy of buffergas-cooled molecules. The saturation intensity of the selected molecular transition is achieved by coupling the probe laser to a high-finesse optical cavity surrounding the cold sample. A cavity ring-down technique is then implemented to perform saturation sub-Doppler measurements as the buffer (He) and molecular gas flux are varied. As an example, the (v(1) + v(3)) R(1) ro-vibrational line in a 20 Kelvin acetylene sample is addressed. By referencing the probe laser to a Rb/GPS dock, the corresponding line-center frequency as well as the self and foreign (i.e., due to the buffer gas) collisional broadening coefficients are absolutely determined. Our approach represents an important step towards the development of a novel method to perform ultra-precise ro-vibrational spectroscopy on an extremely wide range of cold molecules. In this respect, we finally discuss a number of relevant upgrades underway in the experimental setup to considerably improve the ultimate spectroscopic performance. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement