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Tunable resolution terahertz dual frequency comb spectrometer

2016; Optica Publishing Group; Volume: 24; Issue: 26 Linguagem: Inglês

10.1364/oe.24.030100

1094-4087

Francisco Senna Vieira, Flávio C. Cruz, David F. Plusquellic, Scott A. Diddams,

Terahertz technology and applications

Terahertz dual frequency comb spectroscopy (THz-DFCS) yields high spectral resolution without compromising bandwidth. Nonetheless, the resolution of THz-DFCS is usually limited by the laser repetition rate, which is typically between 80 MHz and 1 GHz. In this paper, we demonstrate a new method to achieve sub-repetition rate resolution in THz-DFCS by adaptively modifying the effective laser repetition rate using integrated Mach-Zehnder electro-optic modulators (MZ-EOMs). Our results demonstrate that it is possible to improve the 100 MHz resolution of a terahertz frequency comb by at least 20x (down to 5 MHz) across the terahertz spectrum without compromising the average output power, and to a large extent, its bandwidth. Our approach can augment a wide range of existing THz-DFCS systems to provide a significant and easily adaptable resolution improvement.