Cw terahertz spectrometer with high-precision frequency control

Author

Roggenbuck, Axel ; Deninger, Anselm ; Mayorga, Iván Cámara ; Schmitz, Holger ; Hemberger, Joachim ; Lison, Frank ; Grüninger, Markus

Author_Institution

TOPTICA Photonics AG, Grafelfing, Germany

fYear

2009

fDate

14-19 June 2009

Firstpage

1

Lastpage

1

Abstract

An all-fiber-based cw terahertz spectrometer, which combines distributed feedback (DFB) diode technology and precise interferometric frequency control is developed. Several solid-state samples are used to demonstrate the suitability of the system for high-resolution terahertz spectroscopy. The refractive index was determined directly from the phase shift introduced by the transparent sample, whereas the extinction coefficient was obtained from the transmitted intensity. The results for the absorption signatures of alpha-lactose monohydrate is presented. The transmission spectrum of a MgO etalon (free spectral range 100 GHz) shows regularly spaced transmission peaks and demonstrates the wide tunability of the system. Terahertz-based measurements of the area density of paper is also showed.

Keywords

extinction coefficients; light interferometry; organic compounds; refractive index; submillimetre wave spectra; submillimetre wave spectroscopy; transparency; DFB; all-fiber-based cw terahertz spectrometer; alpha-lactose monohydrate; distributed feedback diode; etalon; extinction coefficient; high-resolution terahertz spectroscopy; interferometric frequency control; paper area density; phase shift; refractive index; solid-state samples; transmission spectrum; transmitted intensity; Absorption; Diodes; Distributed feedback devices; Extinction coefficients; Frequency control; Phase shifting interferometry; Refractive index; Solid state circuits; Spectroscopy; Submillimeter wave technology;

fLanguage

English

Publisher

ieee

Conference_Titel

Lasers and Electro-Optics 2009 and the European Quantum Electronics Conference. CLEO Europe - EQEC 2009. European Conference on

Conference_Location

Munich

Print_ISBN

978-1-4244-4079-5

Electronic_ISBN

978-1-4244-4080-1

Type

conf

DOI

10.1109/CLEOE-EQEC.2009.5191952

Filename

5191952