Highly efficient broadband terahertz generation from ultrashort laser filamentation in liquids

Indranuj Dey, Kamalesh Jana, Vladimir Yu. Fedorov, Anastasios D. Koulouklidis, Angana Mondal, Moniruzzaman Shaikh, Deep Sarkar, Amit D. Lad, Stelios Tzortzakis, Arnaud Couairon and G. Ravindra Kumar ()
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Indranuj Dey: Tata Institute of Fundamental Research
Kamalesh Jana: Tata Institute of Fundamental Research
Vladimir Yu. Fedorov: Texas A&M University at Qatar
Anastasios D. Koulouklidis: Institute of Electronic Structure and Laser, Foundation for Research and Technology Hellas
Angana Mondal: Tata Institute of Fundamental Research
Moniruzzaman Shaikh: Tata Institute of Fundamental Research
Deep Sarkar: Tata Institute of Fundamental Research
Amit D. Lad: Tata Institute of Fundamental Research
Stelios Tzortzakis: Texas A&M University at Qatar
Arnaud Couairon: Centre de Physique Théorique, École Polytechnique, CNRS
G. Ravindra Kumar: Tata Institute of Fundamental Research

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract Generation and application of energetic, broadband terahertz pulses (bandwidth ~0.1–50 THz) is an active and contemporary area of research. The main thrust is toward the development of efficient sources with minimum complexities—a true table-top setup. In this work, we demonstrate the generation of terahertz radiation via ultrashort pulse induced filamentation in liquids—a counterintuitive observation due to their large absorption coefficient in the terahertz regime. The generated terahertz energy is more than an order of magnitude higher than that obtained from the two-color filamentation of air (the most standard table-top technique). Such high terahertz energies would generate electric fields of the order of MV cm-1, which opens the doors for various nonlinear terahertz spectroscopic applications. The counterintuitive phenomenon has been explained via the solution of nonlinear pulse propagation equation in the liquid medium.

Date: 2017
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DOI: 10.1038/s41467-017-01382-x

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