Zobrazeno 1 - 10
of 45
pro vyhledávání: '"N. N. Posnov"'
Autor:
Konstantin Yumashev, N. N. Posnov, P. V. Prokosin, Valerij S. Gurin, Svetlana Zolotovskaya, A. A. Alexeenko
Publikováno v:
Semiconductors. 38:812-817
Energy and kinetic characteristics of the induced transparency in quartz sol-gel glasses containing copper selenide nanoparticles of different stoichiometry are studied. The dependence of the nonlinear optical properties of the glass samples on the c
Autor:
V. G. Savitskii, Konstantin Yumashev, N. N. Posnov, Él. Raaben, A. A. Zhilin, Alexander M. Malyarevich
Publikováno v:
Journal of Applied Spectroscopy. 71:83-88
Relaxation of bleaching in PbS nanoparticles (of mean size 5.5 nm) has been investigated at different intensities of exciting radiation. The relaxation of bleaching is double exponential with fast (tens of picoseconds) and slow (nanoseconds) componen
Autor:
Konstantin Yumashev, P. V. Prokoshin, M I Demchuk, Alexander M. Malyarevich, Andrey A. Lipovskii, N. N. Posnov, Vasili G. Savitski
Publikováno v:
Applied Physics B: Lasers and Optics. 75:841-846
Passive mode locking and saturable absorber Q-switching of neodymium lasers at 1,3 mum with PbS-doped phosphate glasses are demonstrated. Q-switched pulses of 120 ns (0.1 muJ) in duration (energy) and the average output power of 3 mW from a quasi-cw
Publikováno v:
Journal of Alloys and Compounds. 341:366-370
Excited state absorption spectra (ESA) of the LiGa 5 O 8 (LGO), MgAl 2 O 4 (MALO) and LaMgAl 11 O 19 (LMA) crystals doped with the tetrahedral Co 2+ ion were studied under excitation at the 4 A 2 → 4 T 1 ( 4 F) transition. The ESA band was observed
Autor:
A. A. Alekseenko, Alexander M. Malyarevich, Valerij S. Gurin, Konstantin Yumashev, I. M. Melnichenko, V. B. Prokopenko, N. N. Posnov
Publikováno v:
Journal of Applied Spectroscopy. 67:699-704
Quartz glasses containing ultradisperse particles (with a mean radius of 5 ± 3 nm) of semiconductor compounds CuxS and CuInS2 were synthesized using the sol-gel technology. The line and differential absorption spectra of such glasses were investigat
Autor:
N. N. Posnov, Valerij S. Gurin, Konstantin Yumashev, Alexander M. Malyarevich, V. P. Mikhailov
Publikováno v:
Journal of Applied Spectroscopy. 67:494-501
An investigation of the properties of CuFeS2 and CuFe2S3 nanoparticles with a different degree of surface oxidation was carried out. Oxidation leads to the appearance of an additional absorption band with a maximum near 1.1 µm, which is assigned to
Publikováno v:
Applied Physics B: Lasers and Optics. 70:179-184
The differential absorption spectra of Co2+: MgAl2O4 (MALO) crystal were studied with a picosecond pump-probe technique under excitation of the 4A2→4T1(4P) and 4A2→4T1(4F) transitions of the tetrahedral Co2+ ion. The difference spectra of stimula
Autor:
I. G. Poloyko, N. N. Posnov, P. V. Prokoshin, Konstantin Yumashev, F. Mejid, Vladimir L. Kalashnikov, V. P. Kozich, V. P. Mikhailov
Publikováno v:
Optical and Quantum Electronics. 32:43-48
The nonlinear refractive index n2 of Yb3+:KY(WO4)2 crystal has been measured using picosecond Z-scan technique. The magnitude of n2 was found to be 8.7 × 10−16 cm2/W at wavelength of 1.08 μm. The numerical modeling based on fluctuation model show
Autor:
I. M. Melnichenko, V. B. Prokopenko, V. P. Mikhailov, N. N. Posnov, Valerij S. Gurin, Konstantin Yumashev, A. A. Alexeenko, Alexander M. Malyarevich
Publikováno v:
Journal of Applied Physics. 87:212-216
Silica glasses with ultrafine CuxS and CuInS2 particles (average radius of 5±3 nm) were fabricated by means of a sol–gel technique. Linear and differential absorption spectra were studied. The glasses reveal absorption peaks in the 600–700 nm ra
Autor:
Valerij S. Gurin, V. P. Mikhailov, N. N. Posnov, Konstantin Yumashev, Alexander M. Malyarevich
Publikováno v:
Applied Physics B: Lasers and Optics. 70:111-116
Nonlinear optical properties of surface-oxidized CuFexSy (x=1, 2, y=2, 3) nanoparticles incorporated in polymeric film are studied. Surface oxidation of CuFeS2 and CuFe2S3 nanoparticles results in appearance of the additional absorption band with max