阿秒光源在材料领域的应用

Since the 21st century, attosecond (attosecond, 1 as = 10^(-18) s) technology has gradually developed rapidly since its birth, bringing us an unprecedented time-resolved detection capability. In the past, femtosecond (1 fs = 10^(-15) s) pump - probe ultrafast spectroscopy technology has been widely used in the study of ultrafast dynamics of materials. Its pulse width and photon energy can well study the material properties determined by outer electrons. The emergence of attosecond technology makes it possible for us to study faster physical processes and the material properties determined by inner electrons. This article introduces three ultrafast pump - probe technologies, namely attosecond transient absorption spectroscopy, attosecond time-resolved angular-resolved photoelectron spectroscopy and mid-infrared ultrafast spectroscopy, and their typical application examples in the field of materials, and looks forward to the application prospects of attosecond light sources in the field of materials.

21世纪以来,阿秒(attosecond, 1 as=10~(-18) s)技术从诞生逐渐走向快速发展,为我们带来了前所未有的时间分辨(time-resolved)探测能力.以往飞秒(1 fs=10~(-15) s)泵浦-探测(pump-probe)超快光谱技术被广泛应用于材料的超快动力学研究,其脉宽和光子能量可以很好地研究由外层电子决定的材料物性.阿秒技术的出现使我们有可能研究更快的物理过程以及由内层电子决定的物性.本文介绍阿秒瞬态吸收谱(attosecond transient absorption spectroscopy) 、阿秒时间分辨角分辨光电子能谱(attosecond time-resolved angular-resolved photoelectron spectroscopy)和中红外超快光谱(mid-infrared ultrafast spectroscopy)等三种超快泵浦-探测技术及其在材料领域的典型应用实例,并对阿秒光源在材料领域的应用前景进行展望.