Virtual Journal of Laser

Author(s): Tridib Ray, Arijit Sharma, S. Jyothi, and S. A. Rangwala

We laser cool rubidium atoms to form a magneto-optical trap, within a Fabry-Perot cavity, and demonstrate strong coupling of the cold atoms to the cavity. The coupling strength is measured using the vacuum Rabi frequency splitting (VRS) of transmitted, cavity-coupled light on atomic resonance. The V...

[Phys. Rev. A 87, 033832] Published Tue Mar 26, 2013

Author(s): O. Atabek, R. Lefebvre, A. Jaouadi, and M. Desouter-Lecomte

Intense-field molecular photodissociation offers the possibility to define resonances of zero width for particular intensities at given wavelengths. We show how a laser pulse can be shaped to fulfill, at all times, the conditions leading to a zero width for a particular resonance originating from a ...

[Phys. Rev. A 87, 031403] Published Mon Mar 25, 2013

Author(s): G. Ranjit and C. I. Sukenik

We report on our investigation of the formation and survival of long-lived Rydberg states in argon produced by pulsed laser excitation of ultracold metastable state argon atoms in a magneto-optical trap. The states studied have a ²P_1/2 core. Low angular momentum Rydberg states with this core normall...

[Phys. Rev. A 87, 033418] Published Mon Mar 25, 2013

Author(s): Emilio Ignesti, Federico Tommasi, Roberto Buffa, Lorenzo Fini, Emiliano Sali, and Stefano Cavalieri

We present an all-optical incoherent control of superluminal propagation of a 3 ns laser pulse. The experimental results show an induced advance up to 400 ps, without significant distortion, continuously controlled by the characteristics of a control pulse. The measurements agree with numerical simu...

[Phys. Rev. A 87, 033828] Published Mon Mar 25, 2013

Author(s): Barry M. Cornella, Sergey F. Gimelshein, Taylor C. Lilly, and Andrew D. Ketsdever

Molecular nitrogen at 0.8 atm and 300 and 500 K and methane at 0.8 atm and 300 K were subjected to optical lattices formed by narrow-band 532-nm laser pulses with intensities on the optical axis near, but below, the gas ionization limit. A third pulse was introduced to experimentally probe the respo...

[Phys. Rev. A 87, 033825] Published Fri Mar 22, 2013

Author(s): P. M. Dinh, P. Romaniello, P.-G. Reinhard, and E. Suraud

In a previous work, Pohl et al. [ Phys. Rev. Lett. 84 5090 (2000)] have proposed a simple scheme for the evaluation of photoelectron spectra of clusters subject to a laser field by collecting one-particle wave functions at a given measuring point close to absorbing boundaries. The scheme gives reli...

[Phys. Rev. A 87, 032514] Published Thu Mar 21, 2013

Author(s): David Petrosyan and Klaus Mølmer

We study two-photon excitation of Rydberg states of atoms under stimulated adiabatic passage with delayed laser pulses. We find that the combination of strong interaction between the atoms in Rydberg state and the spontaneous decay of the intermediate exited atomic state leads to the Rydberg excitat...

[Phys. Rev. A 87, 033416] Published Thu Mar 21, 2013

Author(s): A. Čerkić and D. B. Milošević

S-matrix theory of electron-atom scattering assisted by a few-cycle laser pulse is introduced. The result obtained in the first Born approximation corresponds to the direct or single scattering, while the result in the second Born approximation corresponds to the rescattering or double scattering co...

[Phys. Rev. A 87, 033417] Published Thu Mar 21, 2013

Author(s): Shian Zhang, Chenhui Lu, Tianqing Jia, Jianrong Qiu, and Zhenrong Sun

In this Brief Report, we present a scheme to control the (2+1) resonance-enhanced multiphoton-ionization (REMPI) photoelectron spectrum in cesium (Cs) atom by shaping the femtosecond laser pulse with a rectangular amplitude modulation. We show that the amplitude-shaped laser pulse can induce a hole ...

[Phys. Rev. A 87, 035403] Published Thu Mar 21, 2013

Author(s): A. V. Flegel, M. V. Frolov, N. L. Manakov, Anthony F. Starace, and A. N. Zheltukhin

Orders of magnitude increases of the cross sections are predicted for laser-assisted low-energy electron-atom scattering (accompanied by absorption of laser photons) as the laser ellipticity is increased. These ellipticity-controlled enhancements are manifestations of the field-free electron-atom sc...

[Phys. Rev. A 87, 033414] Published Wed Mar 20, 2013