Intensity clamping and controlled efficiency of X-ray generation under femtosecond laser interaction with nanostructured target in air and heliumстатья
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Дата последнего поиска статьи во внешних источниках: 4 июня 2021 г.
Аннотация:We have performed theoretical calculations aimed at modeling the propagation dynamics of a focused femtosecond laser beam in a nonlinear gas medium. It was obtainedthat when helium is blown into the focal area, the intensity clamping level is about 2,5times higher than when air is present. The conditions for optimal placement of the targetrelative to the position of the vacuum focus and, accordingly, allowing to achievemaximum intensity are found. It was found that under interaction in air femtosecondCr:forsterite laser ( λ=1,24 μm, E<1 mJ, 100fs) with nanostructured iron containing tape the intensity clamping effect is observed. Replacing the air medium with helium leads to essentially increase in line (6.4keV) X-ray yield. Increasing the pulse duration to 300fs led to an increase in the X-ray output twice and reached 3*10^5 photons/pulse in solid angle.