Dithered-edge sampling of terahertz pulses
Jake Bromage, Ian A. Walmsley, and C. R. Stroud, Jr.
Appl. Phys. Lett. 75, 2181 (1999).
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We introduce a technique for ultrawideband measurement of terahertz pulses
called dithered-edge sampling (DES). The technique makes use of a
photoconductive receiver, but the detection bandwidth is much wider than
that of the receiver alone. The key to increasing the bandwidth is the
addition of an ultrafast optically triggered attenuator that chops the
terahertz pulse before its detection. The bandwidth is limited only by the
duration of the optical pulse used to trigger the attenuator. We use a
combination of derivative dither and an integrating receiver to recover the
terahertz field directly from the measured signal. When used alone, the
slow receiver blurs the measured terahertz pulse width to 1.3 ps. However,
the increased time resolution of the DES system (triggered attenuator plus
receiver) allows one to measure source-limited terahertz pulse widths (400
fs in this case).
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