Electro-optic THz dual-comb architecture for high-resolution, absolute spectroscopy Articles uri icon

publication date

  • January 2019

start page

  • 415

end page

  • 418

issue

  • 2

volume

  • 44

International Standard Serial Number (ISSN)

  • 0146-9592

Electronic International Standard Serial Number (EISSN)

  • 1539-4794

abstract

  • An absolute-frequency terahertz (THz) dual-frequency comb spectrometer based on electro-optic modulators for tunable, high-resolution, and real-time rapid acquisition is presented. An optical line of a master frequency comb (filtered via optical injection locking) serves as the seed to electro-optically generate a pair of new frequency combs (probe and local oscillator). Photomixing both combs with another coherent line from the same original master comb generates a narrow linewidth THz dual-comb with teeth frequencies that can be referenced to a radio-frequency standard. The system is validated with a proof-of-principle measurement of a microwave filter in the W-band.

keywords

  • frequency standards; microwave filters; modulators; spectrometers; absolute frequency; electro-optic modulators; frequency combs; local oscillators; narrow-line width; optical injection locking; proof of principles; rapid acquisition; terahertz spectroscopy