Leonid L Losev

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Some children infected by HIV-1 demonstrate nervous system disease. Because a significant percentage of these children are believed to be infected during gestation and it is thought that HIV-1 may infect distinct glial populations, this work tested the hypothesis that different HIV-1 isolates can infect cells of the developing human fetal central nervous(More)
HIV infection of central nervous system (CNS) tissue is a common finding in both adult and pediatric AIDS. Because most children are believed to be infected perinatally, we have developed a model of HIV CNS infection that utilizes explant organotypic cultures of human fetal CNS tissue. Using this model we previously reported that both lymphocytotropic and(More)
The technique of frequency shifting of sub-100 fs laser pulses was developed. It is based on the stimulated Raman scattering pair of chirped laser pulses with orthogonal polarization. The 50 fs laser pulse at the wavelength of 810 nm was converted to 68 fs Stokes pulse at the wavelength of 1060 nm with energy conversion efficiency of 20%.
15-fs, 15-μJ light pulses at the central wavelength of 515 nm were generated by two-stage nonlinear compression of 300-fs, 150-μJ ytterbium laser pulses. The compression was based on the pulse spectrum broadening by self-phase modulation in gas filled capillary and second harmonic generation in crystal.
Broad Raman-multi-frequency spectra were generated from the resonant two-color excitation of the deuterium molecule rotational Raman transition (J=0?2), using ultraviolet bi-harmonic lasers with a quartz hollow fiber. Fifty pure rotational Raman spectral lines (34 lines that have intensity within 10% of the strongest spectral line) from 230 to 290 nm were(More)
We report on the generation of broadband, high-energy femtosecond pulses centered at 1.28 μm by stimulated Raman scattering in a pressurized hydrogen cell. Stimulated Raman scattering is performed by two chirped and delayed pulses originating from a multi-mJ Ti:sapphire amplifier. The Stokes pulse carries record-high energy of 4.4 mJ and is recompressed(More)
Mutlifrequency parametric Raman generation was carried out in a KGd(WO(4))(2) crystal by use of a dual-wavelength Ti:sapphire laser system. It was found that with femtosecond pump pulses the efficiency of Raman generation is low because of the onset of self-phase modulation. The mechanism for suppression of stimulated Raman scattering by self-phase(More)
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