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Albrecht Bartels, Thomas Dekorsy
THz Spectroscopy Based on High-Speed ASOPS
Keywords: ultrafast optics, femtosecond laser, time-domain spectroscopy, THz spectroscopy
Asynchronous optical sampling (ASOPS) is a method for ultrafast time-domain spectroscopy that operates without mechanical delay generators that are common to conventional approaches. This is the central prerequisite for a massive reduction of data acquisition time and permits time-domain spectroscopy at the shot-noise limit without additional measures for suppression of technical noise. Mediated through the use of femtosecond lasers with 1 GHz repetition rate, ASOPS can be performed with a time-resolution close to 100fs. This high-speed ASOPS approach is ideally suited for terahertz time-domain spectroscopy at frequencies ranging from approximately 100 GHz to a few THz. Here, we discuss a THz time-domain spectroscopy system based on high-speed ASOPS with 3 THz bandwidth and 1 GHz frequency resolution that delivers high dynamic range spectra within just 1s of averaging time.
tm – Technisches Messen, Oldenbourg Wissenschaftsverlag
Print ISSN: 0171-8096
Volume: 75, 01/2008
Pages: 023 - 030