Long-wavelength-infrared laser filamentation in solids in the near-single-cycle regime

Qu, Shizhen; Nagar, Garima C.; Li, Wenkai; Liu, Kun; Zou, Xiao Ping; Luen, Seck Hon; Dempsey, Dennis; Hong, Kyung-Han; Wang, Qi Jie; Zhang, Ying; Shim, Bonggu; Liang, Houkun

doi:10.1364/ol.389456

Cited by 14 publications

(1 citation statement)

References 31 publications

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“…Moreover, mid-IR laser pulses are found to be an excellent tool to access Email: kyunghan@mit.edu the anomalous group-velocity dispersion (GVD) regime [6] for pumping SCG in most dielectric materials, enabling to study soliton-like pulse propagation dynamics in a laser filament, such as self-compression, self-steepening, and the formation of light bullets. In fact, the self-compression of mid-IR laser pulses in a filament has been theoretically and experimentally studied by a few groups [6][7][8]11] .…”

Section: Introductionmentioning

confidence: 99%

Multi-octave-spanning supercontinuum generation through high-energy laser filaments in YAG and ZnSe pumped by a 2.4 μm femtosecond Cr:ZnSe laser

Nam

Nagar

Dempsey

et al. 2021

High Pow Laser Sci Eng

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We present experimental and numerical investigations of high-energy mid-infrared filamentation with multi-octave-spanning supercontinuum generation (SCG), pumped by a 2.4 μm, 250 fs Cr:ZnSe chirped-pulse laser amplifier. The SCG is demonstrated in both anomalous and normal dispersion regimes with YAG and polycrystalline ZnSe, respectively. The formation of stable and robust single filaments along with the visible-to-mid-infrared SCG is obtained with a pump energy of up to 100 μJ in a 6-mm-long YAG medium. To the best of the authors’ knowledge, this is the highest-energy multi-octave-spanning SCG from a laser filament in a solid. On the other hand, the SCG and even-harmonic generation based on random quasi-phase matching (RQPM) are simultaneously observed from the single filaments in a 6-mm-long polycrystalline ZnSe medium with a pump energy of up to 15 μJ. The numerical simulations based on unidirectional pulse propagation equation and RQPM show excellent agreement with the measured multi-octave-spanning SCG and even-harmonic generation. They also reveal the temporal structure of mid-infrared filaments, such as soliton-like self-compression in YAG and pulse broadening in ZnSe.

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Section: Introductionmentioning

confidence: 99%

Multi-octave-spanning supercontinuum generation through high-energy laser filaments in YAG and ZnSe pumped by a 2.4 μm femtosecond Cr:ZnSe laser

Nam

Nagar

Dempsey

et al. 2021

High Pow Laser Sci Eng

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Supercontinuum in IR–MIR from Narrow Bandgap Bulk Solid-State Materials

Dubietis

Jukna²,

Couairon³

2022

The Supercontinuum Laser Source

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Wavelength scaling of electron collision time in plasma for strong field laser-matter interactions in solids

2021

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Although the dielectric constant of plasma depends on electron collision time as well as wavelength and plasma density, experimental studies on the electron collision time and its effects on laser-matter interactions are lacking. Here, we report an anomalous regime of laser-matter interactions generated by wavelength dependence (1.2–2.3 µm) of the electron collision time in plasma for laser filamentation in solids. Our experiments using time-resolved interferometry reveal that electron collision times are small (<1 femtosecond) and decrease as the driver wavelength increases, which creates a previously-unobserved regime of light defocusing in plasma: longer wavelengths have less plasma defocusing. This anomalous plasma defocusing is counterbalanced by light diffraction which is greater at longer wavelengths, resulting in almost constant plasma densities with wavelength. Our wavelength-scaled study suggests that both the plasma density and electron collision time should be systematically investigated for a better understanding of strong field laser-matter interactions in solids.

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Long-wavelength-infrared laser filamentation in solids in the near-single-cycle regime

Cited by 14 publications

References 31 publications

Multi-octave-spanning supercontinuum generation through high-energy laser filaments in YAG and ZnSe pumped by a 2.4 μm femtosecond Cr:ZnSe laser

Multi-octave-spanning supercontinuum generation through high-energy laser filaments in YAG and ZnSe pumped by a 2.4 μm femtosecond Cr:ZnSe laser

Supercontinuum in IR–MIR from Narrow Bandgap Bulk Solid-State Materials

Wavelength scaling of electron collision time in plasma for strong field laser-matter interactions in solids

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