Flexible control of nonlinear processes under femtosecond filamentation using adjustable high-pressure gases and supercritical fluids

E. I. Mareev; F. V. Potemkin; E. A. Migal; N. V. Minaev; V. M. Gordienko

doi:10.1117/12.2520937

30 April 2019 Flexible control of nonlinear processes under femtosecond filamentation using adjustable high-pressure gases and supercritical fluids

E. I. Mareev, F. V. Potemkin, E. A. Migal, N. V. Minaev, V. M. Gordienko

Author Affiliations +

Proceedings Volume 11026, Nonlinear Optics and Applications XI; 1102604 (2019) https://doi.org/10.1117/12.2520937
Event: SPIE Optics + Optoelectronics, 2019, Prague, Czech Republic

Abstract

We demonstrate a novel approach of femtosecond laser pulse spectral-temporal control under filamentation in a wide range of pressures from 5 bar up to supercritical state. We showed that laser-induced processes such as supercontinuum generation and pulse self-compression could be tuned both by pressure and by energy adjustment due to the nonlinear refractive index alteration via pressure change. Thanks to the high pressure-controlled nonlinearity, a broadband (from 250 to 2500nm) supercontinuum with total efficiency more than 50% of energy can be generated in supercritical Xe and CO₂. It was also demonstrated that the femtosecond laser pulse can be compressed in Xe in the femtosecond monofilamentation mode by 3.5 times with efficiency as high as 60%.

Conference Presentation

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E. I. Mareev, F. V. Potemkin, E. A. Migal, N. V. Minaev, and V. M. Gordienko "Flexible control of nonlinear processes under femtosecond filamentation using adjustable high-pressure gases and supercritical fluids ", Proc. SPIE 11026, Nonlinear Optics and Applications XI, 1102604 (30 April 2019); https://doi.org/10.1117/12.2520937

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