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Martínez Matos, Óscar ; Torchia, Gustavo Adrián ; Lencina, Alberto Germán ; Tocho, Jorge Omar | Springer-Verlag | 2008-05Volume grating formation by spatially-selective defect bleaching is demonstrated in coloured KCl:CO_3K_2 crystals. The sample is coloured by a train of pulses with a wavelength of ?=?266 nm and bleached with a cw Ar-laser with a wavelength of ?=[...]texto impreso
Martínez Matos, Óscar ; Vaveliuk, Pablo ; Torchia, Gustavo Adrián ; Ruiz, B. ; Bolognini, Néstor Alberto | IEEE-Inst Electrical Electronics Engineers Inc. | 2001-08The steady-state exact solution for the higher harmonic gratings that synthesize the space-charge field is derived without restrictions within an electron-hole transport model which allows the behavior of these harmonic gratings to be determined[...]texto impreso
Martínez Matos, Óscar ; Torchia, Gustavo Adrián ; Vaveliuk, Pablo ; Tocho, Jorge Omar | Institute of Physics | 2001-07-30The importance of the role of the ion-lattice coupling in determining the energy levels of Cr^3^+ ions in congruent LiNbO_3 crystals doped with 2.9% of ZnO is demonstrated in this paper. The Racah parameters: B = 533 cm^-1, C = 3244 cm^-1 and th[...]texto impreso
It is shown how the linear Gouy phase of an ideal nondiffracting beam of +/-(k - k_z)z form, with k_z being the projection of the wavevector of modulus k of the plane wave spectrum onto the propagation axis z, is built from a rigorous treatment [...]texto impreso
Martínez Matos, Óscar ; Torchia, Gustavo Adrián ; Vaveliuk, Pablo ; Tocho, Jorge Omar | Pergamon-Elsevier Science Ltd | 2003-08This paper shows the important role that plays the electron-lattice coupling to represent correctly the energy levels of Cr^3^+ ions in Nb^5^+ site into congruent LiN_bO_3 crystals doped with 5.3% of ZnO. Racah's parameters: and crystal field [...]texto impreso
Martínez Matos, Óscar ; Torchia, Gustavo Adrián ; Bilmes, Gabriel M. ; Tocho, Jorge Omar ; Ranea Sandoval, Héctor Francisco | Springer-Verlag | 2005-04The origin of the acoustic signals that are generated in the bulk of a KDP crystal during irradiation with short UV laser pulses is determined. The generation of these signals by excitation with moderate or high optical fluences is linked to the[...]texto impreso
Martínez Matos, Óscar ; Torchia, Gustavo Adrián ; Tocho, Jorge Omar ; Khaidukov, Nikolai Mikhailivich | Pergamon-Elsevier Science Ltd | 2004We have studied the influence of the electron-lattice coupling on the luminescence quantum yield for Cr^3^+ ions in a Cs_2NaAlF_6 crystal. For this purpose, we analyze the absorption and emission spectra of Cr^3^+ ions by means of the configurat[...]texto impreso
Martínez Matos, Óscar ; Torchia, Gustavo Adrián ; Bilmes, Gabriel M. ; Tocho, Jorge Omar | American Physical Society | 2004-06Transient defects in potassium dihydrogen phosphate (KDP) were characterized by using the acoustic signals generated in the crystal when it is impinged with pulsed laser radiation. These defects are produced by simultaneous absorption of two ?=2[...]texto impreso
Martínez Matos, Óscar ; Torchia, Gustavo Adrián ; Vaveliuk, Pablo ; Bilmes, Gabriel M. ; Tocho, Jorge Omar | IOP Publishing Ltd. | 2002-03Spontaneous noncollinear second harmonic generation in potassium dihydrogen phosphate (KDP) crystals was studied theoretically and experimentally as a function of the scattering centres on the surface of the crystal. A model that explains the ma[...]
