Controlling Atomic Line Shapes
Controlling Atomic Line Shapes
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DOI：
10.1126/science.1238396
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发表时间：
2013-05
期刊：
影响因子：
56.9
通讯作者：
C. Lin;W. Chu
中科院分区：
文献类型：
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作者：
C. Lin;W. Chu
强红外激光可以用来控制原子的谱线形状，这对光谱学和量子动力学过程具有重要意义。[另见Ott等人的报告]光吸收光谱是揭示材料微观结构的重要工具。观察到的谱线位置揭示了激发量子态的能级，而谱线的形状取决于材料在光被吸收后如何弛豫。在光频区，吸收轮廓具有对称的形状。然而，通过将材料耦合到强激光上，可以控制吸收，导致许多有趣的现象，如电磁诱导透明(EIT)(1)、慢光和停止光(2)等。将这种操作扩展到极端紫外线(XUV)和软X射线频率是一个挑战。正如本期第716页所报道的那样，近年来，随着强超快少飞秒红外激光的出现，Ott等人。(3)证明这种操纵现在是可能的。
Intense infrared lasers can be used to control the spectral line shapes of atoms, with implications for spectroscopy and quantum dynamical processes. [Also see Report by Ott et al.] The spectroscopy of light absorption is an essential tool for uncovering the microscopic structure of a material. The observed spectral line positions reveal the energy levels of the excited quantum states, whereas the line shapes are determined by how the material relaxes after light is absorbed. In the optical frequency regime, the absorption profile has a symmetric shape. By coupling the material to an intense optical laser, however, the absorption can be controlled, leading to many interesting phenomena such as electromagnetically induced transparency (EIT) (1), slow and stopped light (2), and others. Extending such manipulations to extreme ultraviolet (XUV) and soft x-ray frequencies has presented a challenge. With the advent of intense ultrafast few-femtosecond infrared lasers in recent years, as reported on page 716 of this issue, Ott et al. (3) demonstrate that such manipulations are now possible.