Abstract
Optical frequency comb technology has been successfully used as an ultra-precise frequency ruler in
frequency metrology, but it also provides powerful tools in broad areas. By precisely controlling the
frequency and the phase of optical frequency combs, metrology applications with ultra-high accuracy
with ultra-wide dynamic range, multi-dimensionality, and versatile controllability can be achieved. This
paper presents the development of various metrology applications of optical frequency combs using such
attractive features. First, we extended the dual-comb technique to the time-domain and the coherent
spectroscopy of solids and developed a versatile spectroscopy technique for the rapid, high-precision,
wide-dynamic range measurements as well as the full characterization of a broad range of materials.
Next, using a rapid and highly accurate dimensional conversion based on an optical frequency comb, a
novel method for ultrafast one-shot 3D imaging with high-accuracy and wide-range is presented. With
versatile multi-dimensional controllability, broad application fields remain open to the comb.
