Virtual Journal of Laser

C. H. Wu, F. Tan, M. Feng, and N. Holonyak, Jr.
Oxide-confined quantum-well microcavity vertical-cavity surface-emitting lasers (VCSELs) of three-diameters (aperture size d~2, 2.5, and 3.5 [mu]m) have been fabricated that operate as nearly single-mode lasers at ultralow thresholds I=0.15, 0.16, and 0.20 mA. Relative spectral intensities are meas ... [Appl. Phys. Lett. 97, 091103 (2010)] published Wed Sep 1, 2010.

C. Ke, Z. Yang, J. S. Pan, W. Zhu, and L. Wang
SnO thin films were deposited on quartz substrates by pulsed laser deposition and postannealed at different temperatures in oxygen ambience. X-ray diffraction, Hall measurement, and x-ray photoelectron spectroscopy were employed to investigate the properties of the annealed SnO thin films. An anomal ... [Appl. Phys. Lett. 97, 092101 (2010)] published Mon Aug 30, 2010.

Kenji Kitamura, Hideki Hatano, Shunji Takekawa, Daniel Schutze, and Masakazu Aono
We demonstrate the pyroelectric effect induced by a short pulse laser with an intensity up to 6 MW/cm which is used to heat the Fe-doped Lithium niobate crystal. 0.2 degrees C temperature rise induced by a 10 ns laser pulse causes a very large current peak (up to 25 mA) since the rate of temperatu ... [Appl. Phys. Lett. 97, 082903 (2010)] published Fri Aug 27, 2010.

Yu Yao, Xiaojun Wang, Jen-Yu Fan, and Claire F. Gmachl
A quantum cascade laser structure is demonstrated that provides a broadband gain spectrum of 430 cm with a peak emission wavelength around 4.8 [mu]m. The laser active region is based on multiple transitions from strongly coupled upper states to lower laser states. In spite of the broad gain spectr ... [Appl. Phys. Lett. 97, 081115 (2010)] published Fri Aug 27, 2010.

Y. Krockenberger, M. Uchida, K. S. Takahashi, M. Nakamura, M. Kawasaki et al.
SrRuO is a superconductor with a low transition temperature (T~1 K), but has a unique character of p-wave symmetry of the order parameter, demanding epitaxial thin films for Josephson junction studies. We have grown c-axis oriented epitaxial films by a pulsed laser deposition technique on (001) sur ... [Appl. Phys. Lett. 97, 082502 (2010)] published Thu Aug 26, 2010.

Waruna D. Kulatilaka, Paul S. Hsu, Hans U. Stauffer, James R. Gord, and Sukesh Roy
We report direct measurement of H Q-branch Raman coherence lifetimes using time-resolved picosecond coherent anti-Stokes Raman scattering (ps-CARS). A custom-built, high-peak-power, nearly transform-limited ps laser system offers an ideal combination of frequency and temporal resolution for such mea ... [Appl. Phys. Lett. 97, 081112 (2010)] published Thu Aug 26, 2010.

Sylwester Latkowski, Ramon Maldonado-Basilio, Kevin Carney, Josue Parra-Cetina, Severine Philippe et al.
An all-optical heterodyne approach based on a room-temperature controlled semiconductor optical amplifier (SOA) for measuring the frequency and linewidth of the terahertz beat-tone signal from a passively mode-locked laser is proposed. Under the injection of two external cavity lasers, the SOA acts ... [Appl. Phys. Lett. 97, 081113 (2010)] published Thu Aug 26, 2010.

R. Takahashi, K. Valset, E. Folven, E. Eberg, J. K. Grepstad et al.
We have studied spontaneous structural ordering in epitaxial barium stannate thin films, grown on SrTiO(001) substrates by pulsed laser deposition. X-ray diffraction analysis revealed satellite reflections around the Bragg peaks, indicative of nanoscale periodic ordering in the out-of-plane directio ... [Appl. Phys. Lett. 97, 081906 (2010)] published Wed Aug 25, 2010.

Giacomo Scalari, Dana TurCinkova, James Lloyd-Hughes, Maria I. Amanti, Milan Fischer et al.
In this paper we show that by applying a perpendicular magnetic field to a quantum cascade structure it is possible to enhance the gain of different optical transitions. The combination of magnetic confinement with a broadband, cutoff-free optical resonator allows the demonstration of laser action o ... [Appl. Phys. Lett. 97, 081110 (2010)] published Wed Aug 25, 2010.

Andreas Wacker
A simple two-well design for terahertz quantum cascade lasers is proposed which is based on scattering injection and the efficient extraction of electrons from the lower laser level by resonant tunneling. In contrast to existing designs this extraction also controls the positive differential conduct ... [Appl. Phys. Lett. 97, 081105 (2010)] published Tue Aug 24, 2010.