Dr. Koustuban Ravi Profile

Dr. Koustuban Ravi

at Stealth

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Proceedings Article | 15 February 2018 Presentation + Paper

Frequency-shifted sources for terahertz-driven linear electron acceleration

M. Hemmer, G. Cirmi, K. Ravi, F. Ahr, L. Zapata, A.-L. Calendron, H. Çankaya, S. Jolly, V. Leroux, T. Eichner, H. Ishizuki, T. Taira, N. Matlis, A. Maier, F. Kärtner

Proceedings Volume 10516, 105160F (2018) https://doi.org/10.1117/12.2295357

KEYWORDS: Terahertz radiation, Crystals, Optical amplifiers, Lithium niobate, X-rays, Near infrared, Absorption, X-ray sources, Nonlinear crystals, Free electron lasers

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The generation of THz-frequency radiation via nonlinear parametric frequency down-conversion has long been driven by the spectroscopy and imaging communities. As a result, little efforts have been undertaken toward the generation of high energy THz-frequency pulses. THz-frequency radiation has however recently been identified has a promising driver for strong-field physics and an emerging generation of compact particle accelerators. These accelerators require THzfrequency pulses with energies in the multi-millijoule range therefore demanding orders of magnitude improvements from the current state-of-the-art.

Much can be gained by improving the intrinsically low efficiency of the down-conversion process while still resorting to existing state-of-the-art lasers. However, the fundamental Manley-Rowe limit caps the efficiency of parametric downconversion from 1-μm wavelength lasers to sub-THz frequency to the sub-percent range.

We present methods that promise boosting the THz radiation yield obtained via parametric down-conversion beyond the Manley-Rowe limit. Our method relies on cascaded nonlinear three-wave mixing between two spectrally neighboring laser pulses in periodically poled Lithium Niobate. Owing to favorable phase-matching, the down-conversion process avalanches, resulting in spectral broadening in the optical domain. This allows in-situ coherent multiplexing of multiple parametric down-conversion stages within a single device and boosting the efficiency of the process beyond the ManleyRowe limit. We experimentally demonstrated the concept using either broadband, spectrally chirped optical pulses from a Joule-class laser or using two narrowband lasers with neighboring wavelengths. Experimental results are backed by numerical simulations that predict conversion efficiencies from 1 μm to sub-THz radiation in the multi-percent range.

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