High intense single attosecond pulses with photon energy up to EUV

Abstract

The results of numerical simulation of two-photon resonance generation and propagation in Ar+ of single attosecond pulses at two-photon self-induced transparency are presented.

Single and double attosecond pulses: resonance generation and propagation in Ar+

“…[30]. So with a knowledge of the dynamic polarizability for Ar at 800 nm, and taking into account above-mentioned increasing its at two-photon resonance, the value of the matrix element of the polarizability |α 12 (2) with Eqs. (3) and (4) in the case of a coherent interaction for a laser pulse when S(0) = 2π · n(n = 1, 2, 3) and for various β · z ≤ 2, where β = 2πN |w 0 | · |α 12 |ω 21 /c (N ≤ 3 × 10 19 cm −3 ), had shown that no more than one per cent (within 1% accuracy of the simulation) of the pulses energy was scattered in the reverse direction [13].…”

“…Whereas it is the generation of single attosecond pulses with high intensities that is of prime interest for different applications, including XUV pump-probe experiments on a attosecond time scale. So a substantial effort is being dedicated to generating single attosecond pulses [3][4][5][12][13][14].…”

“…New way based on electronic stimulated Raman selfscattering (SRSS) of fs-pulses in rare gases to generate intense individual attosecond pulses for the first time was proposed by us [12]. And some possibilities to generate single subfemtosecond pulses from initial 4.63 fs, 7 fs, and 10 fs pulses, using SRSS in singly ionized rare gases, was considered in our previous papers [1,13].…”

“…Such laser pulses with S(0) = 2πn can propagate through medium (β • z ≈ 1) in the RSIT regime [17][18][19][20]. Furthermore, the propagation of the pulses with S = 2π [12,13,18,20], S = 4π [13], and S = 6π [34] leads to effective self-broadening of the spectrum and the generation of a spectral supercontinuum due to the SRSS. The dynamics of a laser pulse having initially a Gaussian shape given by…”

“…( 3), ( 4), and ( 6). An improved and many times tested version of the code presented in [12,13,[17][18][19][20] is used on grid of 4096 points per one period of an electromagnetic field. This provided good solution (better than 1% accuracy).…”