Abstract-Terahertz cross-correlation spectroscopy driven by incoherent light from a superluminescent diode

Daniel Molter, Michael Kolano, and Georg von Freymann

Fig. 1 Experimental setup: The output of the superluminescent diode (SLD) is optionally bandpass filtered (BP) and amplified by an EDFA. Afterwards, the light is sent to a standard TDS-like setup consisting of a beam splitter (50:50), delay section, terahertz receiver (Rx) and emitter (Tx) as well as reflective terahertz optics. Photomixers for CW terahertz generation and detection are used.

https://www.osapublishing.org/oe/abstract.cfm?uri=oe-27-9-12659

We present a novel terahertz spectroscopy principle by using incoherent light from a super luminescent diode for terahertz cross-correlation spectroscopy. The combless nature of this light source leads to a truly continuous terahertz spectrum. We demonstrate the possibility to influence the terahertz spectral bandwidth of the system by changing the bandwidth of different bandpass filters in the system. Depending on the employed bandpass filter we achieve peak dynamic ranges of 60 dB or a terahertz spectral width of about 1.7 THz. The applicability of the measurement system to spectroscopic terahertz measurement tasks is demonstrated.

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