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Multichannel terahertz time-domain spectroscopy system at 1030 nm excitation wavelength

 
: Brahm, Anika; Wilms, Annika; Dietz, Roman J.B.; Göbel, Thorsten; Schell, Martin; Notni, Gunther; Tünnermann, Andreas

:
Postprint (2.4 MByte; PDF; )

Optics Express 22 (2014), No.11, pp.12982-12993
ISSN: 1094-4087
English
Journal Article, Electronic Publication
Fraunhofer IOF ()
terahertz imaging; arrays; Far infrared or terahertz; terahertz spectroscopy

Abstract
We present Terahertz (THz) imaging with a 1D multichannel time-domain spectroscopy (TDS) system which operates with a photoconductive array of 15 detection channels excited by a 1030 nm femtosecond fiber laser. The emitter and detector are photoconductive antennas based on InGaAs/InAlAs multi-layer heterostructures (MLHS). We characterized the THz optics and the resolution of the system. The performance is demonstrated by the multichannel imaging of two samples. A simultaneous measurement of 15 THz pulses with a pixel pitch of 1 mm increases the measurement speed of the TDS system by factor 15.

: http://publica.fraunhofer.de/documents/N-294247.html