Compartir
Título
Influence of microscopic and macroscopic effects on attosecond pulse generation using two-color laser fields
Autor(es)
Materia
Attosecond pulses
Femtosecond pulses
Phase matching
Pulse generation
Ultrafast lasers
Ultraviolet lasers
Fecha de publicación
2017-11
Citación
C. Chen, C. Hernández-García, Z. Tao, W. You, Y. Zhang, D. Zusin, C. Gentry, P. Tengdin, A. Becker, A. Jaron-Becker, H. Kapteyn, and M. Murnane, "Influence of microscopic and macroscopic effects on attosecond pulse generation using two-color laser fields," Opt. Express 25, 28684-28696 (2017)
Resumen
Attosecond pulses and pulse trains generated by high-order harmonic generation are finding broad applications in advanced spectroscopies and imaging, enabling sub-femtosecond electron dynamics to be probed in atomic, molecular and material systems. To date, isolated attosecond pulses have been generated either by using very short few-cycle driving pulses, or by using temporal and polarization gating, or by taking advantage of phase-matching gating. Here we show that by driving high harmonics with a two-color linearly polarized laser field, the temporal window for time-gated phase matching is shorter than for the equivalent singe-color driving laser. As a result, we can generate quasi-isolated attosecond pulses with a peak width of ∼ 450 as using relatively long 26 femtosecond laser pulses. Our experimental data are in good agreement with theoretical simulations, and show that the phase matching window decreases by a factor of 4 - from four optical cycles in the case of a single-color fundamental driving laser, to one optical cycle in the case of two-color (ω-2ω) laser drivers. Finally, we also demonstrate that by changing the relative delay between the two-color laser fields, we can control the duration of the attosecond bursts from 450 as to 1.2 fs.
URI
DOI
10.1364/OE.25.028684
Colecciones
- ALF. Artículos [297]