Phase modulation and second-harmonic nulling to eliminate interference fringes from the spectrum of a coherent frequency-domain THz spectrometer

Author

Demers, J.R. ; Kasper, B.

Author_Institution

Emcore Corp., Alhambra, CA, USA

fYear

2013

fDate

1-6 Sept. 2013

Firstpage

1

Lastpage

1

Abstract

We report on the continued progress of a portable, battery-operated frequency domain terahertz spectrometer with an integrated, fiber-coupled, lithium-niobate optical phase-modulator. We discuss the progress on shifting the THz phase 90 degrees between consecutive data samples to remove the interference pattern and on developing a method of employing second harmonic nulling to actively adjust the THz phase and continuously maintain a maximum detected THz signal.

Keywords

integrated optoelectronics; lithium compounds; microwave photonics; optical fibre couplers; optical modulation; phase modulation; terahertz spectroscopy; terahertz wave detectors; LiNbO₃; THz phase shifting; THz signal detection; coherent frequency-domain THz spectrometer; integrated fiber-coupled lithium-niobate optical phase-modulator; phase modulation; portable battery-operated frequency domain terahertz spectrometer; second-harmonic nulling; Atmospheric measurements; Frequency modulation; Length measurement; Particle measurements;

fLanguage

English

Publisher

ieee

Conference_Titel

Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 2013 38th International Conference on

Conference_Location

Mainz

Type

conf

DOI

10.1109/IRMMW-THz.2013.6665794

Filename

6665794