Directional waveguide coupling from a wavelength-scale deformed microdisk laser
Brandon Redding, Li Ge, Glenn S. Solomon, and Hui Cao
We demonstrate uni-directional evanescent coupling of lasing emission from a wavelength-scale deformed microdisk to a waveguide. This is attributed to the Goos-Hanchen shift and Fresnel filtering effect that result in a spatial separation of the clockwise (CW) and counter-clockwise (CCW) propagating ... [Appl. Phys. Lett. 100, 061125 (2012)] published Fri Feb 10, 2012.
Remote lasing in air by recombination and electron impact excitation of molecular nitrogen
Joseph Penano, Phillip Sprangle, Bahman Hafizi, Daniel Gordon, Richard Fernsler et al.
We analyze and simulate the physical mechanisms for a remote atmospheric lasing configuration which utilizes a combination of an ultrashort pulse laser to form a plasma filament of seed electrons, and a heater beam to heat the seed electrons. Nitrogen molecules are excited by electron impact and rec ... [J. Appl. Phys. 111, 033105 (2012)] published Wed Feb 8, 2012.
Analysis of temporal jitter in a copper vapor laser system
D. Durga Praveen Kumar, L. M. Gantayet, Sunita Singh, A. S. Rawat, Paramjit Rana et al.
Temporal jitter in a magnetic pulse compression based copper vapor laser (CVL) system is analyzed by considering ripple present in the input dc power supply and ripple present in the magnetic core resetting power supply. It is shown that the jitter is a function of the ratio of operating voltage to ... [Rev. Sci. Instrum. 83, 025105 (2012)] published Wed Feb 8, 2012.
Highly tunable whispering gallery mode semiconductor lasers with controlled absorber
A. N. Baranov, G. Boissier, R. Teissier, A. M. Monakhov, V. V. Sherstnev et al.
Tunable semiconductor lasers with controlled absorber based on GaInAsSb/GaAlAsSb quantum well heterostructure was fabricated and experimentally studied. The emission wavelength of these lasers shifts from 2.24 to 2.28 [mu]m when the bias on the control contact decreases from the voltage equal to tha ... [Appl. Phys. Lett. 100, 061112 (2012)] published Tue Feb 7, 2012.
Laser and focused ion beam combined machining for micro dies
Y. Yoshida, W. Okazaki, and T. Uchida
We have developed a laser and focused ion beam (FIB) compound process for press mold dies of a micro lens array (MLA) and a micro needle array (MNA) in a glassy carbon (GC). The press mold die of the MLA was roughly fabricated by UV-YAG laser. After this process, we finished this surface by scanning ... [Rev. Sci. Instrum. 83, 02B901 (2012)] published Mon Feb 6, 2012.
Laser ion source development at Holifield Radioactive Ion Beam Facility
Y. Liu, T. Gottwald, C. C. Havener, J. Y. Howe, J. Kiggans et al.
This report describes the efforts made to develop a resonant-ionization laser ion source based on tunable Ti:sapphire lasers for nuclear physics and astrophysics research at Holifield Radioactive Ion Beam Facility. Three Ti:sapphire lasers have been upgraded with individual pump lasers to eliminate ... [Rev. Sci. Instrum. 83, 02A904 (2012)] published Mon Feb 6, 2012.
Effectiveness of frequency mapping on 28 nm device broken scan chain failures
S. H. Goh, Yan Pan, G. F. You, Y. H. Chan, He ran et al.
Frequency mapping methodology is an effective diagnostic tool for detection of manufacturing defects in scan chains. It analyses reflected laser modulations from toggling scan cells to localize defective scan path or scan cell. In this paper, we demonstrate experimentally that the use of solid immer ... [Rev. Sci. Instrum. 83, 023702 (2012)] published Mon Feb 6, 2012.
A new suitor in the carbon-14 dating game
Steven K. Blau
Abstract not available. [Phys. Today 65, 20 (2012)] published Wed Feb 1, 2012.
Enhancement of random lasing assisted by light scattering and resonance energy transfer based on ZnO/SnO nanocomposites
C. S. Wang, H. Y. Lin, T. H. Lin, and Y. F. Chen
A new composite consisting of ZnO nanorods and SnO nanoparticles has been synthesized and characterized. It is found that the UV laser emission from ZnO NRs can be greatly enhanced and more easily achieved by the assistance of SnO NPs. The underlying mechanism is interpreted in terms of light scatte ... [AIP Advances 2, 012133 (2012)] published Wed Feb 1, 2012.
An in situ approach to study trace element partitioning in the laser heated diamond anvil cell
S. Petitgirard, M. Borchert, D. Andrault, K. Appel, M. Mezouar et al.
Data on partitioning behavior of elements between different phases at in situ conditions are crucial for the understanding of element mobility especially for geochemical studies. Here, we present results of in situ partitioning of trace elements (Zr, Pd, and Ru) between silicate and iron melts, up t ... [Rev. Sci. Instrum. 83, 013904 (2012)] published Tue Jan 31, 2012.
Cavity-QED treatment of scattering-induced free-space excitation and collection in high-Q whispering-gallery microcavities
Yong-Chun Liu, Yun-Feng Xiao, Xue-Feng Jiang, Bei-Bei Li, Yan Li et al.
Whispering-gallery microcavity lasers possess ultralow thresholds, whereas convenient free-space optical excitation and collection suffer from low efficiencies due to their rotational symmetries. Here we analytically study a three-dimensional microsphere coupled to a nanosized scatterer in the frame ... [Phys. Rev. A 85, 013843 ] published .
Ultra-broad spontaneous emission and modal gain spectrum from a hybrid quantum well/quantum dot laser structure
S. M. Chen (陈思铭), K. J. Zhou (周可嘉), Z. Y. Zhang (张子旸), D. T. D. Childs, M. Hugues et al.
We propose and demonstrate a hybrid quantum well/quantum dot structure to enhance the gain and spontaneous emission bandwidth of a quantum dot active region. A single quantum well is introduced into a multi-layer stack of quantum dots, spectrally positioned to cancel the losses due to the second exc ... [Appl. Phys. Lett. 100, 041118 (2012)] published Fri Jan 27, 2012.
Time-dynamics of the two-color emission from vertical-external-cavity surface-emitting lasers
A. Chernikov, M. Wichmann, M. K. Shakfa, M. Scheller, J. V. Moloney et al.
The temporal stability of a two-color vertical-external-cavity surface-emitting laser is studied using single-shot streak-camera measurements. The collected data is evaluated via quantitative statistical analysis schemes. Dynamically stable and unstable regions for the two-color operation are identi ... [Appl. Phys. Lett. 100, 041114 (2012)] published Thu Jan 26, 2012.
Enhanced longitudinal mode spacing in blue-violet InGaN semiconductor lasers
I. V. Smetanin and P. P. Vasil'ev
An explanation of observed enhanced longitudinal mode spacing in InGaN semiconductor lasers has been proposed. It has been demonstrated that e-h plasma oscillations, which can exist in the laser active layer at certain driving conditions, are responsible for mode clustering effect. The resonant exci ... [Appl. Phys. Lett. 100, 041113 (2012)] published Thu Jan 26, 2012.
Frequency locking of single-mode 3.5-THz quantum cascade lasers using a gas cell
Y. Ren, J. N. Hovenier, M. Cui, D. J. Hayton, J. R. Gao et al.
We report frequency locking of two 3.5-THz third-order distributed feedback (DFB) quantum cascade lasers (QCLs) by using methanol molecular absorption lines, a proportional-integral-derivative controller, and a NbN bolometer. We show that the free-running linewidths of the QCLs are dependent on the ... [Appl. Phys. Lett. 100, 041111 (2012)] published Wed Jan 25, 2012.
Measurements and imaging of optical gain in optically pumped alkali-rare gas systems
Kristin L. Galbally-Kinney, Daniel L. Maser, William J. Kessler, Wilson T. Rawlins, and Steven J. Davis
We have applied diode laser gain spectroscopy to quantitative spectral measurements and 2-D images of small-signal gain in optically pumped cesium-rare gas mixtures. Results are illustrated for Cs absorption broadened by Kr, with CH added to induce spin-orbit mixing between the upper states (P and P ... [Appl. Phys. Lett. 100, 041110 (2012)] published Wed Jan 25, 2012.
Type-II InP-based lasers emitting at 2.55 [mu]m
Stephan Sprengel, Alexander Andrejew, Kristijonas Vizbaras, Tobias Gruendl, Kathrin Geiger et al.
Room-temperature lasing at 2.55 [mu]m is reported for InP-based GaInAs/GaAsSb type-II quantum well lasers in pulsed mode up to 42 degrees C. This record long-wavelength lasing has become feasible by implementing compressive strain in both materials and a carrier confinement design using an AlAsSb/A ... [Appl. Phys. Lett. 100, 041109 (2012)] published Wed Jan 25, 2012.
Publisher's Note: Evaluation of the systematic shifts of a single-Ca-ion frequency standard [Phys. Rev. A 84, 053841 (2011)]
Yao Huang, Qu Liu, Jian Cao, Baoquan Ou, Peiliang Liu et al.
Abstract not available. [Phys. Rev. A 85, 019912 ] published .
Mapping between quantum dot and quantum well lasers: From conventional to spin lasers
Jeongsu Lee, Rafal Oszwaldowski, Christian Gothgen, and Igor Zutic
We explore similarities between the quantum wells and quantum dots used as optical gain media in semiconductor lasers. We formulate a mapping procedure which allows a simpler, often analytical, description of quantum well lasers to study more complex lasers based on quantum dots. The key observation ... [Phys. Rev. B 85, 045314 ] published .
Erratum: Quantitative atomic spectroscopy for primary thermometry [Phys. Rev. A 83, 033805 (2011)]
Gar-Wing Truong, Eric F. May, Thomas M. Stace, and Andre N. Luiten
Abstract not available. [Phys. Rev. A 85, 019909 ] published .
Investigation of possible microcavity effect on lasing threshold of nonradiative-scattering-dominated semiconductor lasers
Sushil Kumar and Qing Hu
The effect of enhanced rate of spontaneous emission on gain and lasing threshold of semiconductor microcavity lasers has not been discussed clearly. Some reports have suggested that the lasing threshold in microcavities could possibly be lowered due to the so-called Purcell effect. Here, we argue th ... [Appl. Phys. Lett. 100, 041105 (2012)] published Mon Jan 23, 2012.