Interband cascade laser emitting at lambda = 3.75 mu m in continuous wave above room temperature
M. Kim, C. L. Canedy, W. W. Bewley, C. S. Kim, J. R. Lindle et al.
We report a five-stage interband cascade laser that operates at lambda=3.75 [mu]m in cw mode up to a maximum temperature of 319 K. With gold electroplating, epitaxial-side-up mounting, and one facet coated for high reflectivity, a 3 mm x 9.2 [mu]m ridge emits over 10 mW of cw power at 300 K. ... [Appl. Phys. Lett. 92, 191110 (2008)] published Thu May 15, 2008.
Temperature insensitive linewidth enhancement factor of p-type doped InAs/GaAs quantum-dot lasers emitting at 1.3 mu m
D.-Y. Cong, A. Martinez, K. Merghem, A. Ramdane, J.-G. Provost et al.
The temperature dependence of microwave propertiesrelaxation frequency and Henry factorof undoped and p-type doped ten InAs/GaAs quantum-dot layer lasers is reported in the 2080 degrees C range. It is shown that the linewidth enhancement factor of the p-type doped devices is temperature insensitiv ... [Appl. Phys. Lett. 92, 191109 (2008)] published Thu May 15, 2008.
Subhertz linewidth diode lasers by stabilization to vibrationally and thermally compensated ultralow-expansion glass Fabry-P[e-acute]rot cavities
J. Alnis, A. Matveev, N. Kolachevsky, Th. Udem, and T. W. Hansch
We achieved a 0.5 Hz optical beat note linewidth with ~0.1 Hz/s frequency drift at 972 nm between two external cavity diode lasers independently stabilized to two vertically mounted Fabry-Perot (FP) reference cavities with a finesse of 400 000. Vertical FP reference cavities are suspended in midpla ... [Phys. Rev. A 77, 053809 (2008)] published Mon May 12, 2008.
Characteristics of a laser beam spot focused by a binary diffractive axicon
Yuko Kizuka, Makoto Yamauchi, and Yoshihiko Matsuoka
Bessel beams formed by an axicon are nondiffracting beams. Such beams are used in the field of laser machining because they have several desirable characteristics, including a micron-sized focal spot and a deep focal depth. Conical lenses are generally employed for producing Bessel beams. A binary d ... [Opt. Eng. 47, 053401 (2008)] published Mon May 12, 2008.
Laser Ablation of Metals: A 3D Process Simulation for Industrial Applications
Giovanni Tani, Leonardo Orazi, Alessandro Fortunato, and Gabriele Cuccolini
A model for laser milling simulation is presented in this paper. A numerical model able to predict the physical phenomena involved in laser ablation of metals was developed where the heat distribution in the work piece, the prediction of the velocity of the vapor/liquid front, and the physical state ... [J. Manuf. Sci. Eng. 130, 031111 (2008)] published Mon May 12, 2008.
Continuous wave single mode operation of GaInAsSb/GaSb quantum well lasers emitting beyond 3 mu m
T. Lehnhardt, M. Hummer, K. Rossner, M. Muller, S. Hofling et al.
We report on room temperature continuous wave single mode GaInAsSb-GaSb quantum well lasers emitting beyond 3 [mu]m. Quantum well strain and composition were carefully adjusted to enhance the hole confinement without increasing electron confinement in order to avoid inhomogeneous quantum well pumpi ... [Appl. Phys. Lett. 92, 183508 (2008)] published Fri May 9, 2008.
A terahertz quantum cascade laser grown by low-pressure metalorganic vapor phase epitaxy
Lorenzo Sirigu, Alok Rudra, Eli Kapon, Maria I. Amanti, Giacomo Scalari et al.
Demonstration of a terahertz quantum cascade laser grown by a low-pressure metalorganic vapor phase epitaxy is reported. The structural analysis of the grown structure shows a very high degree of vertical uniformity and sharp interfaces. Lasing emission at lambda=90 [mu]m up to 93 K with a thresho ... [Appl. Phys. Lett. 92, 181111 (2008)] published Fri May 9, 2008.
Laser-scanning structural health monitoring with wireless sensor motes
Benjamin D. Buckner, Vladimir Markov, Li-Chung Lai, and James C. Earthman
A highly compact laser-scanning device that can be used as an in situ detection and monitoring device for metal fatigue is described. A prototype is built on a Mica2 wireless sensor mote platform with TinyOS-based firmware. This device is shown to be capable of detecting fatigue-related changes in t ... [Opt. Eng. 47, 054402 (2008)] published Fri May 9, 2008.