Terahertz frequency metrology based on frequency comb techniques
T. Yasui, The University of Tokushima, Japan
For a long time there has been a gap in frequency metrology in the terahertz (THz) region of the spectrum, between the optical and electrical regions, due to the lack of a frequency standard and traceability in this region. This chapter describes the concept of a new THz frequency metrology method based on a frequency comb, which is designed to fill this gap. Three techniques embodying the concept are also described: a THz-comb-referenced spectrum analyzer, an optical-comb-referenced THz synthesizer and a THz-comb-referenced spectrometer. Via coherent frequency linking among microwave, optical and THz waves, these ...