Hybrid InP-based photonic crystal lasers on silicon on insulator wires
Y. Halioua, T. J. Karle, F. Raineri, P. Monnier, I. Sagnes et al.
We report on InP-based photonic crystal lasers operating at 1.585 [mu]m at room temperature, integrated with and evanescently coupled to silicon on insulator (SOI) waveguides. By optically pumping at 1.18 [mu]m through the SOI wires, pulsed laser emission from line defect photonic crystal waveguid ... [Appl. Phys. Lett. 95, 201119 (2009)] published Fri Nov 20, 2009.
Surface-plasmon mode hybridization in subwavelength microdisk lasers
R. Perahia, T. P. Mayer Alegre, A. H. Safavi-Naeini, and O. Painter
Hybridization of surface-plasmon and dielectric waveguide whispering-gallery modes are demonstrated in a semiconductor microdisk laser cavity of subwavelength proportions. A metal layer is deposited on top of the semiconductor microdisk, the radius of which is systematically varied to enable mode hy ... [Appl. Phys. Lett. 95, 201114 (2009)] published Fri Nov 20, 2009.
Spectrally resolved confocal microscopy for laser mode imaging and beam characteristic investigations
W. Brezna and J. Smoliner
In this letter, confocal optical microscopy is used to investigate the intensity patterns of an infrared vertical cavity surface emitting laser in three dimensions with high spectral resolution. The measurements were performed between the near field (Fresnel) regime and the far field (Fraunhofer) re ... [Appl. Phys. Lett. 95, 201118 (2009)] published Fri Nov 20, 2009.
High-speed measurement of foot shape based on multiple-laser-plane triangulation
Matija Jezersek and Janez Mozina
Optical three-dimensional shape measurement of live objects is becoming an important developing and research tool because of its nonintrusive nature and high measuring speed. The current methods are reaching truly high speed in one view configuration, but in the case of the entire object shape measu ... [Opt. Eng. 48, 113604 (2009)] published Fri Nov 20, 2009.
Relaxation oscillations in long-pulsed random lasers
Karen L. van der Molen, Allard P. Mosk, and Ad Lagendijk
We have measured the evolution of the intensity emitted by a random laser during a pump pulse that is comparable in duration to the spontaneous emission decay time. The time traces of our random laser, consisting of titanium dioxide particles and sulforhodamine B dye, show clear relaxation oscillati ... [Phys. Rev. A 80, 055803 (2009)] published Thu Nov 19, 2009.
Terahertz lasing from silicon by infrared Raman scattering on bismuth centers
S. G. Pavlov, U. Bottger, R. Eichholz, N. V. Abrosimov, H. Riemann et al.
Stimulated emission at terahertz frequencies (4.55.8 THz) has been realized by electronic Raman scattering of infrared radiation on bismuth donor centers in silicon at low temperatures. The Stokes shift of the observed laser emission is 40.53 meV which corresponds to the bismuth intracenter transiti ... [Appl. Phys. Lett. 95, 201110 (2009)] published Wed Nov 18, 2009.
190 nm excimer laser drilling of glass slices: Dependence of drilling rate and via hole shape on the diameter of the via hole
K. H. Chen, Wenhsing Wu, Byung Hwan Chu, C. F. Lo, Jenshan Lin et al.
The authors have investigated the effect of the via hole diameter on the laser drilling rate of glass as well as the shape of the drilled via holes. An ArF based 193 nm UV excimer laser was used in this study. The via holes with a diameter of 120 [mu]m showed a 7.5 degrees 9 degrees angled, taper ... [J. Vac. Sci. Technol. B 27, L42 (2009)] published Wed Nov 18, 2009.
Demonstration of a highly coherent 13.9 nm x-ray laser from a silver tape target
Masaharu Nishikino, Yoshihiro Ochi, Noboru Hasegawa, Tetsuya Kawachi, Hiroshi Yamatani et al.
A highly coherent 13.9 nm x-ray laser (XRL) is generated under an oscillator-amplifier configuration using a new tape target system and a driver laser system with a 0.1 Hz repetition rate. The output energy is comparable to the XRL generated with a silver-deposited slab target, and the pointing stab ... [Rev. Sci. Instrum. 80, 116102 (2009)] published Mon Nov 16, 2009.
Combined whispering gallery mode laser from hexagonal ZnO microcavities
J. Dai, C. X. Xu, R. Ding, K. Zheng, Z. L. Shi et al.
The hexagonal ZnO microrods were employed as whispering gallery mode (WGM) microcavities to obtain ultraviolet laser at room temperature. For each individual ZnO microrod, the laser presented low threshold and high quality Q factor and clear WGM spectral structure. The lasing spectra from different ... [Appl. Phys. Lett. 95, 191117 (2009)] published Fri Nov 13, 2009.
Fiber laser generating switchable radially and azimuthally polarized beams with 140 mW output power at 1.6 [mu]m wavelength
Renjie Zhou, Baldemar Ibarra-Escamilla, Joseph W. Haus, Peter E. Powers, and Qiwen Zhan
We report a fiber laser design that is capable of producing switchable radially and azimuthally polarized beams at 1.6 [mu]m. A c-cut calcite crystal within a three-lens telescope is inserted in the cavity of an erbium doped fiber laser design. Due to the axially symmetric birefringence of the calc ... [Appl. Phys. Lett. 95, 191111 (2009)] published Thu Nov 12, 2009.
Feasibility of creation of ceramic disk laser pumped by concentrated solar flux of big solar furnace
S. Bakhramov, Sh. Payziyev, and A. Kasimov
The feasibility of creation of a powerful ceramic Nd:Cr:YAG (YAG denotes yttrium aluminum garnet) disk laser, pumped by the concentrated solar flux of 1 MW big solar furnace, is considered. A new design for highly doped ceramic Nd:Cr:YAG disk laser is proposed and a conversion efficiency of 25% is p ... [J. Renewable Sustainable Energy 1, 063103 (2009)] published Thu Nov 12, 2009.
Reliability assessment and degradation analysis of 1.3 [mu]m GaInNAs lasers
W. Lu, S. Bull, J. J. Lim, R. MacKenzie, S. Sujecki et al.
The degradation of 1.3 [mu]m GaInNAs lasers was investigated using accelerated aging tests. This was followed by comprehensive characterization, including standard light-current-voltage (L-I-V) characterization, capacitance measurements, photoluminescence microscopy (PLM), on-axis amplified spontan ... [J. Appl. Phys. 106, 093110 (2009)] published Thu Nov 12, 2009.
Local tuning of photonic crystal nanocavity modes by laser-assisted oxidation
H. S. Lee, S. Kiravittaya, S. Kumar, J. D. Plumhof, L. Balet et al.
The authors demonstrate a simple method to achieve local tuning of optical modes in GaAs photonic crystal nanocavities by continuous wave laser-assisted oxidation in air atmosphere. By irradiation with a focused laser beam at power levels of a few tens of milliwatts, photonic crystal nanocavity mode ... [Appl. Phys. Lett. 95, 191109 (2009)] published Wed Nov 11, 2009.
Amplification of a high-order harmonic pulse in an active medium of a plasma-based x-ray laser
Chul Min Kim, Karol A. Janulewicz, Hyung Taek Kim, and Jongmin Lee
We investigate theoretically amplification of a high-order harmonic pulse in an active medium of x-ray laser. Using a model based on Maxwell-Bloch equations, which are modified to incorporate time-dependent gain and statistical character of spontaneous emission, the time-dependent nature of the inte ... [Phys. Rev. A 80, 053811 (2009)] published Tue Nov 10, 2009.
Two-state competition in 1.3 [mu]m multilayer InAs/InGaAs quantum dot lasers
Q. Cao, S. F. Yoon, C. Z. Tong, C. Y. Ngo, C. Y. Liu et al.
The competition of ground state (GS) and excited state (ES) is investigated from the as-grown and thermally annealed 1.3 [mu]m ten-layer p-doped InAs/GaAs quantum dot (QD) lasers. The modal gain competition between GS and ES are measured and analyzed around the ES threshold characteristics. Our res ... [Appl. Phys. Lett. 95, 191101 (2009)] published Mon Nov 9, 2009.
Photoacoustic beam profiling of pulsed lasers
Martin Gonzalez, Guillermo Santiago, Veronica Slezak, and Alejandro Peuriot
We introduce a beam profiler of pulsed lasers based on the photoacoustic technique. The method assumes that the initial pressure distribution inside the acoustic cell follows the laser intensity pattern if absorbed energy relaxes rapidly. This initial pressure condition can be described as a superpo ... [Rev. Sci. Instrum. 80, 113106 (2009)] published Mon Nov 9, 2009.
Spectroscopic determination of the doping and mobility of terahertz quantum cascade structures
J. Lloyd-Hughes, Y. L. Delley, G. Scalari, M. Fischer, V. Liverini et al.
Terahertz time-domain spectroscopy is shown to provide a convenient and rapid means to measure the conductivity of individual layers in semiconductor heterostructures such as terahertz quantum cascade lasers. By modeling the complex transmission at terahertz frequencies, the electron density and the ... [J. Appl. Phys. 106, 093104 (2009)] published Thu Nov 5, 2009.
Optical frequency stabilization of a 10 GHz Ti:sapphire frequency comb by saturated absorption spectroscopy in rubidium
D. C. Heinecke, A. Bartels, T. M. Fortier, D. A. Braje, L. Hollberg et al.
The high power per mode of a recently developed 10 GHz femtosecond Ti:sapphire frequency comb permits nonlinear Doppler-free saturation spectroscopy in Rb with a single mode of the comb. We use this access to the natural linewidth of the rubidium D line to effectively stabilize the optical frequenci ... [Phys. Rev. A 80, 053806 (2009)] published Wed Nov 4, 2009.
Thermal-induced refractive-index planar waveguide laser
Hongxiang Kang (康宏向), Haitao Zhang (张海涛), and Dongsheng Wang (王东生)
The feasibility of a thermal-induced refractive-index planar waveguide laser was demonstrated. The condition for the guided modes to be confined in the gain region was calculated. A thermal-induced refractive-index planar waveguide laser was made simply by pumping a thin center layer of a slab cryst ... [Appl. Phys. Lett. 95, 181102 (2009)] published Mon Nov 2, 2009.
Electrically tunable terahertz quantum-cascade laser with a heterogeneous active region
Suraj P. Khanna, Mohammed Salih, Paul Dean, A. Giles Davies, and Edmund H. Linfield
We demonstrate experimentally a terahertz frequency quantum-cascade laser which can be tuned electronically, in a step-wise manner from typically 3.07 to 3.40 THz, by changing the applied electric field across the device. To achieve this, the gallium growth rate was successively reduced during growt ... [Appl. Phys. Lett. 95, 181101 (2009)] published Mon Nov 2, 2009.
Classifying the Basic Parameters of Ultraviolet Copper Bromide Laser
S. G. Gocheva-Ilieva, I. P. Iliev, K. A. Temelkov, N. K. Vuchkov, and N. V. Sabotinov
The performance of deep ultraviolet copper bromide lasers is of great importance because of their applications in medicine, microbiology, high-precision processing of new materials, high-resolution laser lithography in microelectronics, high-density optical recording of information, laser-induced fl ... [AIP Conf. Proc. 1186, 413 (2009)] published Fri Oct 30, 2009.