We present a rapid-scan, time-domain terahertz spectrometer employing femtosecond Er:fiber technology and an acousto-optic delay with attosecond precision, enabling scanning of terahertz transients over a 12.4-ps time window at a waveform refresh rate of 36 kHz, and a signal-to-noise ratio of 1.7 × 105. Our approach enables real-time monitoring of dynamic THz processes at unprecedented speeds, which we demonstrate through rapid 2D thickness mapping of a spinning teflon disc at a precision of 10 nm/. The compact, all-optical design ensures alignment-free operation even in harsh environments.
Femtosecond terahertz time-domain spectroscopy at 36 kHz scan rate using an acousto-optic delay
B. Urbanek, M. Möller, M. Eisele, S. Baierl, D. Kaplan, C. Lange, R. Huber; Femtosecond terahertz time-domain spectroscopy at 36 kHz scan rate using an acousto-optic delay. Appl. Phys. Lett. 21 March 2016; 108 (12): 121101. https://doi.org/10.1063/1.4944459
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