Blonskyi, I.
Kadan, V. M.
Pavlova, S.
Pavlov, Ihor
Shpotyuk, O.
Khasanov, O. K.
The peculiarities of the femtosecond filamentation in Kerr media has been studied using a set of time-resoling experimental techniques. These include the temporal self-compression of a laser pulse in the filamentation mode, repulsive and attractive interactions of filaments, and influence of the birefringence on the filamentation. The propagation of femtosecond laser pulses at the 1550-nm wavelength in c-Si is studied for the first time using methods of time-resolved transmission microscopy. The nonlinear widening of the pulse spectrum due to the Kerr- and plasma-caused self-phase modulation is recorded.


DSMC Simulations of low-density choked flows in parallel-plate channels
Ilgaz, M; Çelenligil, Mehmet Cevdet (2002-07-25)
Rarefied choked flows in parallel-plate channels have been studied using the direct simulation Monte Carlo technique. Calculations are performed for various transitional flows, and results are presented for the computed flowfield quantities, wall pressures and discharge coefficients. Comparisons are made with the available experimental data, and the physical and numerical factors which affect the solutions are discussed. Separate calculations are performed for the "nearly-incompressible" rarefied channel fl...
Space-charge-limited current analysis in amorphous InSe thin films
Yılmaz, Koray Kamil; Parlak, Mehmet (2004-04-01)
The study of space-charge-limited currents (SCLC) in amorphous InSe thin films is presented. The temperature-dependent current-voltage (J-V) measurements were carried out for TO/a-lnSe/Au sandwich structures in the range of 200-320 K. For all samples, ohmic behavior was observed up to an electric field strength of about 2 x 10(5) V cm(-1). From the temperature dependence of conductivity data, the position of the thermal equilibrium Fermi level E-fo is determined as 250 meV above the valence band E-v. At hig...
Experimental characterization of a tuned vibration absorber
Aksoy, Tuğrul; Özgen, Gökhan Osman; Acar, Bülent; Gençoğlu, Caner (2016-01-01)
In this paper, experimental characterization studies conducted for a tuned vibration absorber is presented. The tuned vibration absorber has been particularly designed to reduce transverse resonant vibration response of a supported cylinder structure at its dominant two modes. Various testing configurations and techniques have been used such as transmissibility measurements, frequency response measurements, sweep sine testing, impact testing, and random testing. Different testing approaches were needed to e...
Optically stimulated luminescence dating of pottery from Turkey
Oke, G; Yurdatapan, E (2000-10-02)
In this study, the potential of optically stimulated luminescence (OSL) dating for archaeological potteries was investigated. Firstly, recently purchased OSL and alpha counter systems were calibrated. Then, archaeological sherds taken from Datca-Burgaz (Mugla, Turkey) archaeological site of archaic and classical period (700-400 BC) were dated. Samples were prepared by the fine grain technique and paleodose was found by using the additive dose technique. The annual doses of uranium and thorium were determine...
Thermally assisted variable range hopping in Tl4S3Se crystal
ZIQAN, ABDELHALIM M; QASRAWI, A F; MOHAMMAD, ABDULFTAH H; Hasanlı, Nızamı (Springer Science and Business Media LLC, 2015-6)
In this study, a modified model for the application of the thermionic and hopping current conduction mechanisms in the presence of continuous mixed conduction is investigated, discussed, experimented and simulated. It is observed that there exists a contribution from the hopping conductivity to the total conduction even at temperature ranges where the thermionic emission is mainly dominant. The contribution weight of a specific mechanism at particular temperature range is estimated. In addition, a modifi...
Citation Formats
I. Blonskyi, V. M. Kadan, S. Pavlova, I. Pavlov, O. Shpotyuk, and O. K. Khasanov, “ULTRASHORT LIGHT PULSES IN TRANSPARENT SOLIDS: PROPAGATION PECULIARITIES AND PRACTICAL APPLICATIONS,” UKRAINIAN JOURNAL OF PHYSICS, pp. 457–463, 2019, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/57397.