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Creators/Authors contains: "Chaudhary Nagar, Garima"

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

https://doi.org/10.1364/OL.389456

Qu, Shizhen ; Chaudhary Nagar, Garima ; Li, Wenkai ; Liu, Kun ; Zou, Xiao ; Hon Luen, Seck ; Dempsey, Dennis ; Hong, Kyung-Han ; Jie Wang, Qi ; Zhang, Ying ; et al ( April 2020 , Optics Letters)

We experimentally demonstrate long-wavelength-infrared (LWIR) femtosecond filamentation in solids. Systematic investigations of supercontinuum (SC) generation and self-compression of the LWIR pulses assisted by laser filamentation are performed in bulk KrS-5 and ZnSe, pumped by $\sim<#comment/> 145 f s$ , 9 µm, 10 µJ pulses from an optical parametric chirped-pulse amplifier operating at 10 kHz of repetition rate. Multi-octave SC spectra are demonstrated in both materials. While forming stable single filament, 1.5 cycle LWIR pulses with 4.5 µJ output pulse energy are produced via soliton-like self-compression in a 5 mm thick KrS-5. The experimental results quantitatively agree well with the numerical simulation based on the unidirectional pulse propagation equation. This work shows the experimental feasibility of high-energy, near-single-cycle LWIR light bullet generation in solids.

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