High-Power Single-Cycle Mid-Infrared Transients Generated via Intra-Pulse Difference-Frequency Mixing at 2 μm
| Autor: | Thomas Siefke, Lenard Vamos, Daniel Gerz, Uwe D. Zeitner, Christina Hofer, Thomas Butler, Alexander Apolonskiy, Ferenc Krausz, Ioachim Pupeza, Martin Heusinger, Tobias Heuermann, Jia Xu, Wolfgang Schweinberger, Christian Gaida, Jens Limpert, Martin Gebhardt, J. A. Gessner, Nicholas Karpowicz |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
business.industry 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Power (physics) Pulse (physics) 010309 optics Optics Sampling (signal processing) 0103 physical sciences Waveform Time domain 0210 nano-technology business Spectroscopy Ultrashort pulse Excitation |
| Zdroj: | Scopus-Elsevier |
| Popis: | The development of high-power, ultrafast coherent light sources in the mid-infrared (MIR) spectral region is subject to intensive research, due to the promise of improving both time- and frequency-domain spectroscopic methods, in particular for background-free field-resolved spectroscopy (FRS) [1,2]. In FRS, the molecular vibrational response of a sample upon impulsive, resonant excitation is measured in the time domain, e.g., via electro-optic sampling (EOS). Recent efforts have identified frequency down-conversion via intra-pulse difference frequency generation (IPDFG) as a viable route for producing high-power, waveform-stable MIR pulses for FRS [2,3]. With 2-μm driving sources, broader bandwidths [4,5] and higher efficiencies [5] can be achieved compared to 1-μm and 1.5-μm, in part due to a wider variety of nonlinear crystals with a high nonlinearity. Here, we present IPDFG driven by a 2-μm, thulium-fibre chirped-pulse amplification (CPA) system. This source uniquely combines broad bandwidth (6–18 μm), high average power (0.5 W), waveform stability, and a high repetition rate (50 MHz). In addition, we demonstrate for the first time EOS of the MIR using a short, high-power 2-μm sampling pulse. |
| Databáze: | OpenAIRE |
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