Abstract:

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.