Abstract
We demonstrate broadband THz generation driven by an ultrafast thin-disk laser (TDL) oscillator. By optical rectification of 50-fs pulses at 61 MHz repetition rate in a collinear geometry in crystalline GaP, THz radiation with a central frequency at around 3.4 THz and a spectrum extending from below 1 THz to nearly 7 THz are generated. We realized a spectroscopic characterization of a GaP crystal and a benchmark measurement of the water-vapor absorption spectrum in the THz range. Sub-50-GHz resolution is achieved within a 5 THz bandwidth. Our experiments show the potential of ultrafast TDL oscillators for driving MHz-repetition-rate broadband THz systems.
Highlights
THz time-domain spectroscopy (THz-TDS) is a powerful tool to explore material properties and the dynamics of complex molecular systems through static and time-resolved investigations [1,2,3,4,5]
We conducted benchmarking linear THz-TDS experiment, measuring water vapor absorption spectrum with a sub-50-GHz resolution achieved in a frequency range between 0.5 and 5 THz
We will investigate the influence of the pulse duration on the THz generation in GaP crystals
Summary
THz time-domain spectroscopy (THz-TDS) is a powerful tool to explore material properties and the dynamics of complex molecular systems through static and time-resolved investigations [1,2,3,4,5]. Developed diode-pumped ultrafast Yb-based lasers emitting at ~1 μm central wavelength demonstrated operation at average powers up to the kW level and high repetition rates with hundreds of femtosecond pulse duration [8,9,10,11]. In these lasers, detrimental thermal effects are significantly reduced due to alternative gain medium geometries (fibre, slab, thin disk) which allow for an efficient heat dissipation. We benchmarked our system via THz spectroscopy of water vapor Due to their power scalability and the high temporal resolution provided by sub-100-fs pump pulses, we believe that this result confirms the potential of ultrafast TDL oscillators to drive high-power broadband THz sources for static and time-resolved THz-TDS
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