| Autor: |
Vicario, Carlo, Ovchinnikov, Andrey V., Chefonov, Oleg V., Hauri, Christoph P. |
| Rok vydání: |
2016 |
| Předmět: |
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| Druh dokumentu: |
Working Paper |
| Popis: |
The ideal laser source for the emerging research field of nonlinear Terahertz (THz) spectroscopy should offer radiation with a large versatility and deliver both ultra-intense multi-octave spanning single-cycle pulses and user-selectable multi-cycle pulses at narrow linewidth. The absence of such a table-top source has hampered advances in numerous THz disciplines including imaging, nonlinear photonics and spectroscopy, selective out-of-equilibrium excitation of condensed matter and quantum systems. Here we introduce a highly versatile table-top THz laser platform providing single-cycle GV/m transients as well as spectrally narrow pulses tunable in bandwidth and central frequency across 5 octaves with hundreds of MV/m field strength. The compact scheme is based on optical rectification of a temporally modulated laser beam in organic crystals. It allows for the selection of THz oscillation cycles from 1 to >50 and central frequency tuning range from 0.5 to 7 THz by directly changing the modulation period of the driving laser. The versatility of the THz source is demonstrated by providing a broadband 5-octave spanning spectrum as well as a spectrally narrow line tunable across the full optical rectification phase-matching band with a minimum width of dv=30 GHz, corresponding to dE=0.13 meV and lambda^-1=1.1 cm-1. The presented table-top source shows performances similar or even beyond to that of a large-scale THz electron accelerator facility but offering in addition versatile multi-color and advanced femtosecond pump-probe opportunities at ultralow timing jitter. |
| Databáze: |
arXiv |
| Externí odkaz: |
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