Asynchronous optical sampling with GHz repetition rate femtosecond lasers for high precision terahertz spectroscopy

We report a terahertz time-domain spectrometer with 6 THz spectral coverage and 1 GHz resolution which is based on high-speed asynchronous optical sampling. High-speed asynchronous optical sampling is based on two femtosecond lasers with approximately 1 GHz repetition rate. The two lasers are stabil...

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Bibliographic Details
Published in2011 XXXth URSI General Assembly and Scientific Symposium pp. 1 - 4
Main Authors Dekorsy, T., Klatt, G., Gebs, R., Janke, C., Bartels, A.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.08.2011
Subjects
Absorption
Delay
High speed optical techniques
Optical pulses
Optical sensors
Spectroscopy
Ultrafast optics
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Summary:We report a terahertz time-domain spectrometer with 6 THz spectral coverage and 1 GHz resolution which is based on high-speed asynchronous optical sampling. High-speed asynchronous optical sampling is based on two femtosecond lasers with approximately 1 GHz repetition rate. The two lasers are stabilized in their repetition rate to an off-set frequency of approximately 2 kHz. The time delay between a pump pulse exciting a photoconductive THz emitter and the probe pulses is hence scanned at 2 kHz scan rate without employing a mechanical delay stage. The timing jitter between the pump and the probe pulses is reduced to 40 fs over the full scan range giving a high time-resolution. We demonstrate the capabilities of this system for gas spectroscopy and the characterization of frequency selective surfaces with characteristic frequencies in the THz range.
ISBN:1424451175
9781424451173
DOI:10.1109/URSIGASS.2011.6050589