Femtosecond THz time domain spectroscopy at 36 kHz scan rate using an acousto-optic delay

Abstract

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 $1.7\times 10^5/\sqrt{\mathrm{Hz}}$. 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 $10nm/\sqrt{\mathrm{Hz}}$. The compact, all-optical design ensures alignment-free operation even in harsh environments.

arXiv commentPublished in Applied Physics Letters

References in corpus (4)

• Engineering ultrafast spin currents and terahertz transients by magnetic heterostructures
• Non-thermal separation of electronic and structural orders in a persisting charge density wave
• Femtosecond Quasiparticle and Phonon Dynamics in Superconducting YBa2Cu3O7 Studied by Wideband Terahertz Spectroscopy
• Rapid-scan acousto-optical delay line with 34 kHz scan rate and 15 attosecond precision

Cited by in corpus (5)

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• Pump-probe micro-spectroscopy by means of an ultra-fast acousto-optics delay line
• Shot noise limited high speed stimulated Raman microscopy
• Acousto-optically driven single-shot ultrafast optical imaging