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An electronic read-out circuit for time-domain terahertz imaging with photoconductive antennas

M Herrmann, M Tani, M Watanabe and K Sakai

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We have developed a signal amplifier for the detection of weak repetitive pulsed signals superimposed on a large background. It is based on a double gated integrator principle with two channels locked to a sequence of alternate signal and background pulses. The circuit is compact and cost effective, and thus suitable for use in large numbers with detector arrays, for example in terahertz imaging. The performance was verified in terahertz time-domain spectroscopy based on an amplified femtosecond laser and found to be better than that of a commercial lock-in amplifier.


PACS

07.57.Pt Submillimeter wave, microwave and radiowave spectrometers; magnetic resonance spectrometers, auxiliary equipment, and techniques

72.40.+w Photoconduction and photovoltaic effects

42.65.Re Ultrafast processes; optical pulse generation and pulse compression

07.50.Hp Electrical noise and shielding equipment

42.62.Fi Laser spectroscopy

Subjects

Condensed matter: electrical, magnetic and optical

Instrumentation and measurement

Optics, quantum optics and lasers

Dates

Issue 21 (7 November 2002)

Received 15 March 2002

Published 17 October 2002



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