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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Tunable resolution terahertz dual frequency comb spectrometer

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Vieira, Francisco S. ; Cruz, Flavio C. ; Plusquellic, David F. ; Diddams, Scott A.
Total Authors: 4
Document type: Journal article
Source: Optics Express; v. 24, n. 26, p. 30100-30107, DEC 26 2016.
Web of Science Citations: 6

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. (C) 2016 Optical Society of America (AU)

FAPESP's process: 08/57857-2 - Photonics for optical communications
Grantee:Hugo Luis Fragnito
Support type: Research Projects - Thematic Grants
FAPESP's process: 11/13777-8 - Time domain terahertz spectroscopy: development of analytical methods, signal processing techniques, biochemical and fundamental studies
Grantee:Celio Pasquini
Support type: Research Projects - Thematic Grants
FAPESP's process: 14/10125-8 - Development of a continuous-wave terahertz spectrometer for analyzing natural gas
Grantee:Francisco Senna Vieira
Support type: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 13/19093-9 - Spectroscopy of molecular gases in the medium and far infrared using optical frequency combs
Grantee:Flavio Caldas da Cruz
Support type: Scholarships abroad - Research