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Control of Harmonic Generation by the Time Delay Between Two-Color, Bicircular Few-Cycle Mid-IR Laser Pulses.

M V Frolov1, N L Manakov1, A A Minina1

  • 1Department of Physics, Voronezh State University, Voronezh 394018, Russia.

Physical Review Letters
|July 14, 2018
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We demonstrate precise control over high-order harmonic generation (HHG) using time-delayed, two-color mid-IR pulses. Adjusting the pulse delay tunes harmonic positions and helicity, with optimal yield near the fundamental period.

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Area of Science:

  • Nonlinear Optics
  • Quantum Optics
  • Attosecond Science

Background:

  • High-order harmonic generation (HHG) is a key process for creating extreme ultraviolet and X-ray light.
  • Controlling HHG is crucial for applications in spectroscopy, imaging, and fundamental physics.
  • Few-cycle, multi-color laser fields offer advanced control mechanisms over HHG properties.

Purpose of the Study:

  • To investigate the control of high-order harmonic generation (HHG) using time-delayed, few-cycle two-color mid-infrared (mid-IR) laser pulses.
  • To explore the influence of pulse delay on harmonic emission positions and helicity.
  • To identify optimal conditions for maximizing HHG yield.

Main Methods:

  • Numerical simulations of the quantum-mechanical equations governing HHG.
  • Analytical modeling to understand the underlying physics of electron dynamics.
  • Parametric study of the time delay between ω and 2ω counterrotating pulses.

Main Results:

  • The time delay between the two-color pulses enables precise control over harmonic positions, including those seemingly forbidden by selection rules.
  • The helicity of individual harmonics can be tuned from left to right circular independently of the driving pulse helicity.
  • Maximum HHG yield is achieved when the time delay is comparable to the fundamental optical period (T).

Conclusions:

  • Time-delayed, two-color few-cycle pulses provide a versatile tool for controlling HHG.
  • This control extends to both the spectral positions and the polarization properties of the generated harmonics.
  • The findings pave the way for tailored light source generation for advanced applications.