Cw THz spectrometer with high SNR and MHz frequency resolution

Author

Deninger, Anselm ; Roggenbuck, Axel ; Schindler, Stephanie ; Mayorga, Iván Cámara ; Schmitz, Holger ; Hemberger, Joachim ; Güsten, Rolf ; Grüninger, Markus

Author_Institution

TOPTICA Photonics AG, Grafelfing, Germany

fYear

2009

fDate

21-25 Sept. 2009

Firstpage

1

Lastpage

2

Abstract

We developed an all-fiber-based continuous-wave terahertz spectrometer based on optoelectronic signal generation and detection. The spectrometer has a very high spectral resolution in the MHz range over the whole tuning range from 50 GHz to 1750 GHz. The signal-to-noise ratio is ~80 dB at 100 GHz and still 50 dB at 1 THz, using a lock-in time constant of 300 ms. We applied the spectrometer to absorption measurements of alpha-lactose monohydrate and demonstrate the suitability of the instrument to determine the area density of paper samples.

Keywords

absorption; spectrometers; terahertz spectroscopy; Cw THz spectrometer; SNR; absorption measurements; all-fiber-based continuous-wave terahertz spectrometer; alpha-lactose monohydrate; frequency 50 GHz to 1750 GHz; frequency resolution; optoelectronic signal detection; optoelectronic signal generation; signal-to-noise ratio; Absorption; Area measurement; Density measurement; Frequency; Signal detection; Signal generators; Signal resolution; Signal to noise ratio; Spectroscopy; Tuning;

fLanguage

English

Publisher

ieee

Conference_Titel

Infrared, Millimeter, and Terahertz Waves, 2009. IRMMW-THz 2009. 34th International Conference on

Conference_Location

Busan

Print_ISBN

978-1-4244-5416-7

Electronic_ISBN

978-1-4244-5417-4

Type

conf

DOI

10.1109/ICIMW.2009.5324631

Filename

5324631