High-Precision Laser intensity Calibration Using Tunneling Ionization
September 30th, 2019 MARCELO CIAPPINA ELI-Beamlines and Insitute of Physics of the Czech Republic Prague, Czech Republic

When coherent electromagnetic radiation generated by powerful laser system is tightly focused, pursuing the aim to achieve a high value of intensity, it may be problematic evaluating this intensity with a sufficient accuracy. Presently, the question of whether or not intensities above 10^21 W/cm^2 have ever been achieved remains open, although values of this order and above are the main goal of the two Extreme Light Infrastructure (ELI) pillars.

In this regard, 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 ionization of atoms and ions in the field of intense laser radiation. 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 evaluate, with a high degree of accuracy, the laser intensity at focus position.

Seminar, September 30, 2019, 10:15. ICFO’s Seminar Room

Hosted by Prof. Maciej Lewenstein