High speed scanning of terahertz pulse by a rotary optical delay line

We demonstrate high speed scanning of a time-domain terahertz pulse by a rotary optical delay line (RODL) incorporated into a photoconductive antenna based terahertz system. The delay line of RODL consists of six rotating convex reflective blades with a rotating speed controlled for a wide range of...

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Bibliographic Details
Published in:Review of scientific instruments 2008-10, Vol.79 (10), p.106102-106102-3
Main Authors: Kim, Geun-Ju, Jeon, Seok-Gy, Kim, Jung-Il, Jin, Yun-Sik
Format: Article
Language:English
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Summary:We demonstrate high speed scanning of a time-domain terahertz pulse by a rotary optical delay line (RODL) incorporated into a photoconductive antenna based terahertz system. The delay line of RODL consists of six rotating convex reflective blades with a rotating speed controlled for a wide range of scan repetition rates. It can perform path length scans of 2.1 cm at a scanning speed of 8.4 m/s while maintaining linearity. The comparison of the terahertz temporal waveform and the frequency spectrum measured by using the RODL and a linear stage optical delay line confirms the linearity of the RODL up to 140 ps at high scan repetition rates of 400 scan/s. A high signal-to-noise ratio, up to a few thousand, can be obtained by averaging multiple terahertz pulses at a high scan speed.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.2995763