Physical Review A
Generalized theory of double-resonance optical pumping of ^{4} He
Thu, 2010-07-29 06:00 — GuestAuthor(s): Michael K. Plante, Duncan L. MacFarlane, Douglas D. McGregor, Robert E. Slocum, William M. Sampson, and Andy W. Brown
We present extensions to the theory of double-resonance laser pumping of ^{4} He in the context of magnetometer instrumentation. This extended theory allows for arbitrary optical polarization, magnetic resonance (H_{1} ) coil orientation, and overall instrument orientation relative to the ambient ma...
[Phys. Rev. A 82, 013837] Published Thu Jul 29, 2010
Nonlinear Fourier-transform spectroscopy of D_{2} using high-order harmonic radiation
Wed, 2010-07-28 06:00 — GuestAuthor(s): Yusuke Furukawa, Yasuo Nabekawa, Tomoya Okino, Sébastien Saugout, Kaoru Yamanouchi, and Katsumi Midorikawa
We have determined the multiphoton ionization and dissociation pathways of D_{2} with the simultaneous irradiation of the high-order harmonic fields and the low-order harmonic fields of Ti:sapphire laser pulses in the visible-vacuum ultraviolet region with the aid of a nonlinear Fourier-transform sp...
[Phys. Rev. A 82, 013421] Published Wed Jul 28, 2010
Recoil effects in multiphoton electron-positron pair creation
Wed, 2010-07-28 06:00 — GuestAuthor(s): K. Krajewska and J. Z. Kamiński
Triply differential probability rates for electron-positron pair creation in laser-nucleus collisions, calculated within the S-matrix approach, are investigated as functions of the nuclear recoil. Pronounced enhancements of differential probability rates of multiphoton pair production are found for ...
[Phys. Rev. A 82, 013420] Published Wed Jul 28, 2010
Isotope effects in the harmonic response from hydrogenlike muonic atoms in strong laser fields
Tue, 2010-07-27 06:00 — GuestAuthor(s): Atif Shahbaz, Thomas J. Bürvenich, and Carsten Müller
High-order harmonic generation from hydrogenlike muonic atoms exposed to ultraintense high-frequency laser fields is studied. Systems of low nuclear-charge number Z are considered where a nonrelativistic description applies. By comparing the radiative response for different isotopes, we demonstrate ...
[Phys. Rev. A 82, 013418] Published Tue Jul 27, 2010
Scattering laser light on cold atoms: Toward multiple scattering signals from single-atom responses
Mon, 2010-07-26 06:00 — GuestAuthor(s): Thomas Wellens, Tobias Geiger, Vyacheslav Shatokhin, and Andreas Buchleitner
We deduce the coherent backscattering signal from two distant laser-driven atoms using single-atom equations. The background and interference components of the double scattering spectrum obtained by this alternative approach agree exactly with the results of the standard master equation treatment. I...
[Phys. Rev. A 82, 013832] Published Mon Jul 26, 2010
Generation of isolated sub-100-as pulses with 30-fs lasers
Thu, 2010-07-22 06:00 — GuestAuthor(s): Songsong Tang and Xianfeng Chen
We propose a scheme to generate isolated sub-100-as pulses with 30-fs lasers. Our model is based on high-order harmonic generation from a helium atom irradiated by a two-color femtosecond laser field, in which the driving and the control fields are linearly polarized and the polarization angle betwe...
[Phys. Rev. A 82, 013827] Published Thu Jul 22, 2010
Direct particle acceleration by two identical crossed radially polarized laser beams
Wed, 2010-07-21 06:00 — GuestAuthor(s): Yousef I. Salamin
Electrons and α particles injected midway between two ultrahigh intensity crossed laser beams of radial polarization are shown to be accelerated in vacuum to several gigaelectron volts and to have average energy gradients in excess of 150 GeV/m. A unique model of the crossing beams is suggested, w...
[Phys. Rev. A 82, 013823] Published Wed Jul 21, 2010
Unified interpretation for second-order subwavelength interference based on Feynman’s path-integral theory
Wed, 2010-07-21 06:00 — GuestAuthor(s): Jianbin Liu and Guoquan Zhang
The second-order spatial subwavelength interference pattern is observed in a modified Michelson interferometer with single-mode continuous-wave laser beams. By analyzing our subwavelength interference experiment based on Feynman’s path integral theory, a unified interpretation for all the second-o...
[Phys. Rev. A 82, 013822] Published Wed Jul 21, 2010
Time-dependent analysis of few-photon coherent control schemes
Tue, 2010-07-20 06:00 — GuestAuthor(s): Shaohao Chen, Agnieszka Jaroń-Becker, and Andreas Becker
We investigate the coherent control of nonresonant two-photon excitation and (2+1) photon ionization processes from the time-dependent perspective. To this end, we have solved the time-dependent Schrödinger equation for a hydrogen atom interacting with an ultraviolet laser field. Results are obtain...
[Phys. Rev. A 82, 013414] Published Tue Jul 20, 2010
Alignment-dependent ionization of molecular hydrogen in intense laser fields
Tue, 2010-07-20 06:00 — GuestAuthor(s): Yulian V. Vanne and Alejandro Saenz
The alignment dependence of the ionization behavior of H_{2} exposed to intense ultrashort laser pulses is investigated on the basis of solutions of the full time-dependent Schrödinger equation within the fixed-nuclei and dipole approximation. The total ionization yields as well as the energy-resol...
[Phys. Rev. A 82, 011403] Published Tue Jul 20, 2010
