光纤光学频率梳

在时域上,光学频率梳(光频梳)表现为时间间隔固定的超短脉冲序列,具有飞秒量级的时间宽度和极高的瞬时电场强度;在频域上,光频梳呈现为数百万频率间隔固定的频率齿的集合,每根梳齿都具备窄线宽稳频连续激光器的频率精度。光频梳已经发展成为一种重要的科研工具,广泛应用于高精度原子、分子特征信息识别,物质内部结构解析,生物成像及空间遥感成像等诸多科学研究领域。文章首先说明光频梳的基本技术原理,然后介绍华东师范大学精密光谱科学与技术国家重点实验室在光频梳研制领域的进展,并详细介绍基于自研光频梳发展的两种应用:双光梳三维编码成像和双光梳分子光谱。

Fiber optical frequency comb

In temporal, an optical frequency comb (OFC) can be described as an ultrashort pulse train with a constant time interval, possessing a femtosecond pulse duration and an extremely high instantaneous electric field. In spectral, an OFC can be depicted as a comb-like aggregation of millions of frequency teeth with a constant frequency interval, and every single frequency tooth of the comb has an extremely narrow linewidth and a high frequency accuracy as a narrow-line-width CW laser owns. With the advance of fiber technology, the fiber OFC has been developed into an important tool in many scientific research fields such as high-precision feature information recognition of atom and molecular, internal structure analysis of matter, biological imaging and remote-sensing space imaging. In this paper, we present the basic technical principles of optical comb, and some progresses in the field of OFC achieved by LPS ECNU are introduced. Especially, based on the homemade fiber OFCs, two proposed applications including dual-comb 3D coding imaging and dual-comb molecular spectral imaging are demonstrated in detail.