Control continuum bandwidth and attosecond pulse generation by infrared laser parametric source

• Published in: The European physical journal. D, Atomic, molecular, and optical physics Vol. 64; no. 1; pp. 171 - 180
• Main Authors: Cheng, C. L., Zhao, G. J., Shao, T. J., Zhu, H. B.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 01-09-2011; EDP Sciences
• Subjects: Applications of Nonlinear Dynamics and Chaos Theory; Atomic; Attosecond pulses; Bandwidth; Continuums; Exact sciences and technology; Frequency conversion ; harmonic generation, including high-order harmonic generation; Fundamental areas of phenomenology (including applications); Harmonic generations; Harmonics; Infrared; Lasers; Molecular; Nonlinear optics; Optical and Plasma Physics; Optics; Physical Chemistry; Physics; Physics and Astronomy; Quantum Information Technology; Quantum Physics; Regular Article; Spectra; Spectroscopy/Spectrometry; Spintronics; Ultrafast processes; optical pulse generation and pulse compression; Attosecond Pulse; Control Pulse; Fundamental Pulse; Broad Continuum; Relative Phase Shift; Continuum; as range; Ultrashort pulse; Infrared laser; Phase shift; fs range; Infrared radiation; Optical harmonic generation; Optical frequency conversion; Optical pulse generation; Nonlinear optics; Higher harmonic
• ISSN: 1434-6060; 1434-6079
• DOI: 10.1140/epjd/e2011-10681-7

We present quantum and classical investigation on high order harmonic generation from two-color scheme by employing different infrared (ir) laser parametric source as control pulse with locked carrier envelope phase. We found harmonic continuum bandwidth is in the function of the negative square of the ir-control pulse’s wavelength from ir parametric source control field. Moreover, harmonic continuum bandwidth shows a linear dependence on the relative strength ratio 
k
and achieves its extreme value when relative phase shift is around zero. A broad continuum with spectral width of 264 eV is observed from a combination field by 6 fs, 800 nm, 6 × 10
14
 W/cm
2
few-cycle fundamental pulse and half-harmonic control pulse with
k
 = 0.5. By further applying a second 10-um ir control pulse, a continuum beyond 353 eV is obtained which supports the generation of an isolated 12 attosecond (as) pulse.