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End date: 2021 × Start date: 2021 × Start date: 2020 × DDC: 530 × Subject: Ultrafast lasers ×

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    Atomic and molecular suite of R-matrix codes for ultrafast dynamics in strong laser fields and electron/positron scattering
    (Bristol : IOP Publ., 2020) Wragg, J.; Benda, J.; Mašín, Z.; Armstrong, G.S.J.; Clarke, D.D.A.; Brown, A.C.; Ballance, C.; Harvey, A.G.; Houfek, K.; Sunderland, A.; Plummer, M.; Gorfinkiel, J.D.; Van Der Hart, H.
    We describe and illustrate a number of recent developments of the atomic and molecular ab initio R-matrix suites for both time-dependent calculations of ultrafast laser-induced dynamics and time-independentcalculations of photoionization and electron scattering. © 2019 Published under licence by IOP Publishing Ltd.
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    Terahertz transient stimulated emission from doped silicon
    (Melville, NY : AIP Publishing, 2020) Pavlov, S.G.; Deßmann, N.; Pohl, A.; Zhukavin, R.K.; Klaassen, T.O.; Abrosimov, N.V.; Riemann, H.; Redlich, B.; Van Der Meer, A.F.G.; Ortega, J.-M.; Prazeres, R.; Orlova, E.E.; Muraviev, A.V.; Shastin, V.N.; Hübers, H.-W.
    Transient-type stimulated emission in the terahertz (THz) frequency range has been achieved from phosphorus doped silicon crystals under optical excitation by a few-picosecond-long pulses generated by the infrared free electron lasers FELIX and CLIO. The analysis of the lasing threshold and emission spectra indicates that the stimulated emission occurs due to combined population inversion based lasing and stimulated Raman scattering. Giant gain has been obtained in the optically pumped silicon due to large THz cross sections of intracenter impurity transitions and resonant intracenter electronic scattering. The transient-type emission is formed under conditions when the pump pulse intervals exceed significantly the photon lifetime in the laser resonator. © 2020 Author(s).