Zobrazeno 1 - 10
of 45
pro vyhledávání: '"Obreshkov, Boyan"'
Autor:
Obreshkov, Boyan, Apostolova, Tzveta
We theoretically investigate photo-ionization and high harmonic generation in the bulk of zinc oxide (ZnO) subjected to intense femto-second laser pulses with mid-infrared wavelength (3 $\mu$m). Below threshold for optical breakdown of ZnO, we show t
Externí odkaz:
http://arxiv.org/abs/2405.01571
Autor:
Apostolova, Tzveta, Obreshkov, Boyan
We investigate photoinization, energy deposition, plasma formation and the ultrafast optical breakdown in crystalline silicon irradiated by intense near-infrared laser pulses with pulse duration $\tau \le $ 100 fs. The occurrence of high-intensity br
Externí odkaz:
http://arxiv.org/abs/2107.07189
Autor:
Obreshkov, Boyan, Apostolova, Tzveta
Publikováno v:
J. Phys.: Conf. Ser. 1571, 012012 (2020)
We present the generation of high order harmonics in crystalline silicon subjected to intense near-infrared 30fs laser pulse. The harmonic spectrum extends from the near infrared to the extreme ultraviolet spectral region. Depending on the pulsed las
Externí odkaz:
http://arxiv.org/abs/2007.06347
Publikováno v:
Applied Surface Science 2020
We investigate the non-linear response and energy absorption in bulk silicon irradiated by intense 12-fs near-infrared laser pulses. Depending on the laser intensity, we distinguish two regimes of non-linear absorption of the laser energy: for low in
Externí odkaz:
http://arxiv.org/abs/1910.09023
Autor:
Obreshkov, Boyan
Publikováno v:
Nuclear Theory 35 (2016), ISSN 1313-2822
The collision-induced shift and broadening of selected dipole transition lines of pionic helium in gaseous helium at low temperatures up to $T=12$ K and pressure up to a few bar are calculated within variable phase function approach. We predict blue
Externí odkaz:
http://arxiv.org/abs/1611.04299
Autor:
Apostolova, Tzveta, Obreshkov, Boyan
Publikováno v:
In Applied Surface Science 15 January 2022 572
Autor:
Apostolova, Tzveta, Obreshkov, Boyan
Publikováno v:
Diamond and Related Materials 82, 165-172 (2018)
We present theoretical results on the high-harmonic generation (HHG) in bulk diamond induced by intense laser pulse of wavelength 800 nm and duration 15 fs. For laser intensity in the range $1 \le I \le 50 $ TW/cm$^2$ above bandgap harmonics are gene
Externí odkaz:
http://arxiv.org/abs/1611.00805
Autor:
Obreshkov, Boyan, Bakalov, Dimitar
Publikováno v:
Phys. Rev. A 93, 062505 (2016)
We calculate the density shift and broadening of selected dipole transition lines of pionic helium in gaseous helium at low temperatures up to T=12 K and pressure up to a few bar. In the approximation of binary collisions the shift and broadening dep
Externí odkaz:
http://arxiv.org/abs/1604.04900
Autor:
Obreshkov, Boyan
Publikováno v:
Nuclear Theory 33 (2014), ISSN 1313-2822
We numerically investigate attosecond streaking time delays in the photoemission of valence and 2p core electrons of aluminum surface. We find that electron emission from the core level band is delayed by $\Delta \tau =100$ attoseconds relative to th
Externí odkaz:
http://arxiv.org/abs/1411.4996
Autor:
Obreshkov, Boyan, Lepetit, Bruno
We evaluate the electron emission current density from jellium metallic surfaces in the Thomas-Fermi-von-Weizs\"acker approximation. We implement the weighted density approximation (WDA) for description of the exchange and correlation energy of inter
Externí odkaz:
http://arxiv.org/abs/1403.2986