Showing papers by "Andrey Popov published in 2004"
TL;DR: In this paper, a theory of quantum control of short-wavelength sum-frequency generation, which employs the continuum states, is developed, employing all-resonant coupling and trade-off optimization of the accompanying constructive and destructive quantum interference effects in the lower-order and higher-order polarizations controlled by the overlap of two autoionizinglike laser-induced continuum structures.
Abstract: A theory of quantum control of short-wavelength sum-frequency generation, which employs the continuum states, is developed. The proposed scheme employs all-resonant coupling and trade-off optimization of the accompanying constructive and destructive quantum interference effects in the lower-order and higher-order polarizations controlled by the overlap of two autoionizinglike laser-induced continuum structures. The scheme does not rely on adiabatic passage, coherent population trapping or maximum atomic coherence as a means to facilitate maximum output. The opportunities for manipulating transparency of the medium and refractive index for the fundamental and generated radiations, as well as nonlinear polarization in the multiple-resonant medium, are shown. This opens the feasibility of creating frequency-tunable narrowband filters, polarization rotators, and dispersive elements for vacuum ultraviolet radiation. The features specific for quantum interference in Doppler-broadened media are investigated. The feasibility of almost complete conversion of long-wavelength fundamental radiation into generated short-wavelength radiation, and of a dramatic decrease in the intensity of required fundamental radiations, is shown.
7 citations
04 Jul 2004
TL;DR: In this paper, the relative contributions of Bragg modes and of modes trapped in the periodic cladding are discussed and experimentally measured propagation losses and numerical simulation of a realistic depressed core Bragg fiber are presented.
Abstract: Experimentally measured propagation losses and numerical simulation of a realistic depressed core Bragg fiber are presented. The relative contributions of Bragg modes and of modes trapped in the periodic cladding are discussed.
2 citations
Posted Content•
TL;DR: In this article, the possibilities for control over the size and properties of silver nanoaggregates with incoherent and laser light are investigated, and the applications in nanoengineering and for giant enhancement of optical processes at nanoscale are discussed.
Abstract: The possibilities for control over the size and properties of silver nanoaggregates with incoherent and laser light are investigated. The applications in nanoengineering and for giant enhancement of optical processes at nanoscale are discussed.
1 citations
1 citations
02 Aug 2004
TL;DR: In this article, a sample, opaque at an inhomogeneously broadened transition, can be made transparent or even strongly amplifying without inversion by two control lower-frequency lasers.
Abstract: A sample, opaque at an inhomogeneously-broadened transition, can be made transparent or even strongly amplifying without inversion by two control lower-frequency lasers. Applications for frequency-tunable filtering, photon switching and amplification in Raman schemes are discussed.
30 Jun 2004
TL;DR: In this paper, anisotropic molecules from strongly absorbing to amplifying state is shown to be possible without population inversion by dc or ac control electric fields, and suitable class of molecules and application in nanophotonics are outlined.
Abstract: Effective switching anisotropic molecules from strongly absorbing to amplifying state is shown to be possible without population inversion by dc or ac control electric fields. Suitable class of molecules and application in nanophotonics are outlined.
02 Aug 2004
TL;DR: In this article, anisotropic molecules from strongly absorbing to transparent and amplifying states are shown to be possible without population inversion by dc or ac control electric fields, and a suitable class of molecules is outlined.
Abstract: Effective switching of anisotropic molecules from strongly absorbing to transparent and amplifying states is shown to be possible without population inversion by dc or ac control electric fields. Suitable class of molecules is outlined.