Working principle of nonlinear pulse self-compression and HHG (IMAGE)

Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS

Working principle of nonlinear pulse self-compression and HHG

Caption

a, Input coupling of the 1.9 μm wavelength laser pulses with 100 fs duration within helium gas at atmospheric pressure. b, The ARHCF is differentially pumped with the output facet located in a high-pressure chamber. At first, the pulses self-compress within the fibre, reaching a peak intensity >1014 W/cm², which causes ionization of the gas. High-order harmonic radiation with photon energies in the soft X-ray spectral region is released due to the recombination of a fraction of the liberated electrons with their parent helium ions. c, The final vacuum chamber contains an annular mirror and a thin metal filter to separate the SWIR light from the generated high-order harmonics.

Credit

by Gebhardt, M., Heuermann, T., Klas, R. et al.

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