Propagation and amplification of an ultrashort laser pulse in a two-level medium is numerically investigated with the use of the finite-difference time-domain (FDTD) procedure simultaneously solving Maxwell and Schrodinger equations with no assumptions characteristic of slowly varying envelope approximation. Comparison of the results of FDTD numerical simulations with the predictions of the pulse area theorem has demonstrated that the developed numerical procedure provides an adequate description of pulse evolution in a two-level medium. Amplification of ultrashort light pulses in a two-level medium is analyzed. Two methods of improving the gain of ultrashort pulses in a two-level medium by modulating the spatial distribution of dipole moments of resonant transitions and using initially chirped frequency-detuned pulses are explored.
Andrei Fedotov, Michael Alfimov, A. Ivanov, Sergei Bagayev, V. Pivtsov, Alexander Tarasevitch, Dietrich von der Linde, A. Podshivalov, Leonid Golovan, Pavel Kashkarov, Valentin Beloglazov, M. Syrchin, Stanislav Konorov, S. Magnitskii, Andrey Tarasishin, Dusan Chorvat, A. Naumov, Dmitri Sidorov-Biryukov, Leonid Melnikov, Nina Skibina, Alexei Zheltikov
The results of experimental and theoretical studies of the properties of holey fibers are presented. The fabrication of holey fibers with a pitch of the two-dimensional periodic structure of the cladding less than 500 nm allowed us to experimentally observe a photonic band gap in transmission spectra of holey fibers tunable within the range of 930 - 1030 nm. It is demonstrated that holey fibers provide an opportunity to considerably increase the efficiency of spectral broadening and phase control of short laser pulses as compared with conventional fibers.
Self-phase modulation and compression of short laser pulses in 1D photonic band-gap (PBG) structures are considered as particular cases of the general problem of the propagation of short light pulses in photonic crystals. The nonlinear finite-different time-domain technique are applied to simulate the propagation of ultrashort laser pulses in linear and nonlinear 1D PBG structures. It is demonstrated that photonic crystals with embedded optical nonlinearity provide an opportunity to efficiently compress laser pulses to a duration of several optical cycles on a submillimeter spatial scale, providing new opportunities for the miniaturization of femtosecond solid-state laser systems. Examples of PBG pulse compressors that can be fabricated by means of currently existing technologies are considered.
It is demonstrated that two-photon polymerization can be employed as a basis for a technology for the fabrication of 3D micro- and submicrostructures, including structures with a periodically alternating refractive index. The rate of polymerization, energy expenditure, and required radiation doses characteristic of two-photon polymerization are estimated. The possibility to apply two-photon polymerization in the bulk of a medium to fabricate 3D photonic crystals in the optical range is discussed.
Dispersion relations of the SPP at the diffused plasma boundary have been calculated. Analytical dispersion relation taking into account spatial nonlocality has been obtained. Two-beam nonlinear excitation of SPP at the sharp plasma boundary has been investigated analytically.
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