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Home NEWS Science News Chemistry

Dual-wavelength lasing: a new tool for steering High-harmonic generation

Bioengineer by Bioengineer
May 30, 2023
in Chemistry
Reading Time: 3 mins read
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(A) MEASURED SPECTRA OF MIR DUAL-WAVELENGTH TUNABLE PULSES BY TUNING THE TEMPORAL OVERLAP BETWEEN DIFFERENT SPECTRAL COMPONENTS OF THE SIGNAL AND PUMP PULSES, WHEN THERE IS CERTAIN RESIDUAL CHIRP AND GROUP DELAY, AT A SPECIFIC PM ANGLE. MIR DUAL WAVELENG
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Multi-wavelength femtosecond pulses with flexible tunability in both temporal and spectral domain have been widely desired owing to their potential applications in controlling strong field ionization, electron dynamics, and high-order harmonic generation. Particularly, ultrafast pulses coherently synthesized by multiple spectral bands are thought as an ingenious instrument to harness or enhance High-harmonic generation(HHG). For the aforementioned applications in strong-field physics, mid-infrared (MIR) lasers attract substantial research efforts, as the pondermotive force scales quadratically with the driving wavelength. Therefore, MIR multi-wavelength-shaped pulses are in highly demand. However, the existing methods for generating multi-wavelength pulses lack freedom in spectral tuning and require sophisticated apparatus for complicated phase and noise control.

(A) MEASURED SPECTRA OF MIR DUAL-WAVELENGTH TUNABLE PULSES BY TUNING THE TEMPORAL OVERLAP BETWEEN DIFFERENT SPECTRAL COMPONENTS OF THE SIGNAL AND PUMP PULSES, WHEN THERE IS CERTAIN RESIDUAL CHIRP AND GROUP DELAY, AT A SPECIFIC PM ANGLE. MIR DUAL WAVELENG

Credit: Ultrafast Science

Multi-wavelength femtosecond pulses with flexible tunability in both temporal and spectral domain have been widely desired owing to their potential applications in controlling strong field ionization, electron dynamics, and high-order harmonic generation. Particularly, ultrafast pulses coherently synthesized by multiple spectral bands are thought as an ingenious instrument to harness or enhance High-harmonic generation(HHG). For the aforementioned applications in strong-field physics, mid-infrared (MIR) lasers attract substantial research efforts, as the pondermotive force scales quadratically with the driving wavelength. Therefore, MIR multi-wavelength-shaped pulses are in highly demand. However, the existing methods for generating multi-wavelength pulses lack freedom in spectral tuning and require sophisticated apparatus for complicated phase and noise control.

Recently, Houkun Liang and his team proposed a relatively simple and compact method to generate MIR pulses with dual-wavelength spectral shaping and exceptional freedom of tunability in both the lasing wavelength and relative spectral amplitudes by combing Martinez compressor and optical parametric amplifier based on LGS crystal. The output MIR spectra exhibit two tunable means: 1. When the dispersion is completely compensated, different dual-wavelength pairs at 5.6, 10 μm; 6.0, 9.6 μm; 6.6, 9.0 μm; 7.1, 8.4 μm; and 8.2 μm with a maximal average power up to 280 mW and a power efficiency of 2.8% at the repetition rate of 50 kHz by adjusting the phase match angle; 2. When the dispersion is partly compensated, the relative spectral amplitudes of a specific pair of dual-wavelength can be arbitrarily changed by controlling the pump delay.

To test the usefulness of the demonstrated high-power MIR light source with dual-wavelength spectra shaping features, HHG is drived by MIR dual-wavelength tunable pulses in a 3-mm-thick polycrystalline ZnSe plate. Thanks to the dual-wavelength tunability, the acquired HHG spectra have traits of spectral shaping of HHG with multiple groups of harmonics in both the spectral position and relative strengths.

MIR ultra-short pulses with outstanding freedom in multi-wavelength spectral shaping can trigger more advanced applications such as enhancement of HHG, THz wave generation, tunable intra-pulse difference-frequency generation, attosecond metrology, and controlling electron localization in molecular dissociation. Moreover, the demonstrated HHG steering method would open new possibilities in exploring femtosecond control of electron dynamics and light-matter interaction in composite molecular systems.



Journal

Ultrafast Science

DOI

10.34133/ultrafastscience.0022

Method of Research

Experimental study

Subject of Research

Not applicable

Article Title

Dual-Wavelength Spectrum-Shaped Mid-Infrared Pulses and Steering High-Harmonic Generation in Solids

Article Publication Date

30-Mar-2023

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