Using high-field ionization for ultrahigh laser pulse intensity calibration (Conference Presentation)

Marcelo Ciappina; Sergey V. Popruzhenko; Georg Korn; Todd Ditmire; Stefan Weber; Sergei Bulanov

doi:10.1117/12.2521037

14 May 2019 Using high-field ionization for ultrahigh laser pulse intensity calibration (Conference Presentation)

Marcelo Ciappina, Sergey V. Popruzhenko, Georg Korn, Todd Ditmire, Stefan Weber, Sergei Bulanov

Proceedings Volume 11036, Relativistic Plasma Waves and Particle Beams as Coherent and Incoherent Radiation Sources III; 110360A (2019) https://doi.org/10.1117/12.2521037
Event: SPIE Optics + Optoelectronics, 2019, Prague, Czech Republic

Abstract

When coherent electromagnetic radiation generated by powerful laser system is tightly focused, pursuing the aim to achieve the highest value of intensity possible, it may be challenging estimating this intensity with a sufficient degree of accuracy. If the energy of a laser pulse, its duration, time profile and focal spot radius are known, evaulation of the maximal intensity is straightforward. However, for high power (sub-petawatt and above) femtosecond laser systems, the inherent uncertainties of these four parameters (except maybe the pulse duration) are rather high, so that different estimation models of the laser intensity in the focus may substantially disagree. Presently, the question of whether or not intensities above 10^21 W/cm2 have ever been achieved remains debatable, although values of this order and above are the main goal of the two Extreme Light Infrastructure (ELI) pillars. In this context, a reliable method allowing to calibrate ultrahigh laser intensities becomes of even higher demand. Here we discuss the reliability of a method for the measurement of ultrahigh laser intensities, based on the effect of tunneling field ionization of heavy atoms and ions. To this end, we employ the highly nonlinear dependence of tunneling ionization rates on the laser intensity. This nonlinearity leads to the emergence of steep plateaus in the distribution of charge states in the laser focus and in such a way to allowing estimate, with a high degree of certainty, the laser intensity at focus.

Conference Presentation

Citation Download Citation

Marcelo Ciappina, Sergey V. Popruzhenko, Georg Korn, Todd Ditmire, Stefan Weber, and Sergei Bulanov "Using high-field ionization for ultrahigh laser pulse intensity calibration (Conference Presentation)", Proc. SPIE 11036, Relativistic Plasma Waves and Particle Beams as Coherent and Incoherent Radiation Sources III, 110360A (14 May 2019); https://doi.org/10.1117/12.2521037

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KEYWORDS

Ionization

Pulsed laser operation

Calibration

Laser systems engineering

Electromagnetic radiation

Femtosecond phenomena

High power lasers

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