Proceedings of Topical Meeting on Optoinformatics (pdf-format, 1.21 ...

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64 OPTOINFORMATICS’05 4. Yoshiaki Sasaki, Hiroki Inage, Ryota Emory, Masaki Goto, eds., “Correction Method <strong>of</strong> Surface Effects in Infra-Red Laser Transillumination CT Imaging”, SPIE Opt. Eng. Press, Bellinggham, WA, 2004, vol.5368, pp. 939-949. 5. Radio engineering chains and signals: I.S.Gonorovsky, M.P.Dyomin - M.:Éáñ¿« and connection, 1994. - 480с. 6. J.W. Goodman. “Introduction to Fourier Optics”, - M.:”Mir”, 1970 - 364с. 7. V.F. Relin . The thesis: “Coherently - optical a posteriori handling <strong>of</strong> X-ray microscopical images”: - L.1986. 8. V.Tuchin, “Tissue Optics: Light Scattering Methods and Instruments for Medical Diagnosis”, TT38, SPIE Opt. Eng. Press, Bellinggham, WA, 2000. 9. A.N.Bashkatov, E.A.Genina, V.I.Kochubey, V.V.Tuchin, E.E.Tchikin, A.B.Knyazev, O.V.Maraev. Optical properties mucos in a spectral diapason <strong>of</strong> 350-2000 nanometers. Publishing house: Optician and a spectroscopy, 2004г. Т. 97.№6. с1037-1042. 10. G.G.Levin, G.N.Vishnjakov. “An optical tomography”. М.,: “Mir”., 1989. 11. Yoshiaki Sasaki, Hiroki Inage, Ryota Emory, Masaki Goto, eds., “Infra-Red Laser Transillumination CT imaging System Using Parallel Fiber Arrays and Optical Switches for Finger Joint Imaging”, SPIE Opt. Eng. Press, Bellinggham, WA, 2004, vol.5368, pp.817-826. 12. Harrison H. Barrett, William Swindell, “Radiological Imaging. The theory <strong>of</strong> Image Formation, detection, and Processing”, Academic Press, 1981, pp.117-142.
SAINT-PETERSBURG, October 17 – 20, 2005 65 GENERATION OF THE DISCRETE SPECTRAL SUPERCONTINUUM IN TWO INTENSIVE ULTRASHORT PULSES INTERACTION M. A. Bakhtin, S. A. Kozlov St.Petersburg State University <strong>of</strong> Information Technologies, Mechanics and Optics Kronverksky pr. 49, St.Petersburg, 197101, Russia E-mail: bakhtin@rain.ifmo.ru It is shown that nonlinear interaction <strong>of</strong> two intensive few-cycle pulses in waveguide can result in high repetition rate optical sequence generation with quasi-discrete spectrum that can be used for information encoding. The fiber optical systems have gained more and more popularity for data transmission. Wave density multiplexing systems are widely used now to achieve high bandwidths for optical channels. Current WDM implementations require many optical sources (one for every channel). In present paper we consider a method <strong>of</strong> generation <strong>of</strong> very high frequency optical signal sequence based on interaction <strong>of</strong> two few-cycle laser pulses propagating collinearly in transparent nonlinear media with different group velocities. The spectrum <strong>of</strong> generated sequence is quasi-discrete that allows using it as multiple light sources with different wavelengths. Fig. 1 demonstrates the interaction <strong>of</strong> the two few-cycle pulses with central wavelengths 780 nm and 390 nm with input intensities 2·10 13 W/cm 2 in fused silica. Fig. 1. Spatial evolution <strong>of</strong> electric field envelope ε ( z , t ) for the pulses interaction with peak input intensity I 1 =I 2 =2·10 13 W/cm 2 Fig. 2. Quasi-discrete spectrum <strong>of</strong> generated sequence The interaction was modeled by nonlinear equations describing the temporal evolution <strong>of</strong> light pulse electrical fields and their spatial - temporal spectra upon the pulses
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