Laserati

Masahiro Nomura, Satoshi Iwamoto, Aniwat Tandaechanurat, Yasutomo Ota, Naoto Kumagai, Yasuhiko Arakawa
We demonstrate optically pumped continuous-wave photonic band-edge microlasers on a two-dimensional photonic crystal slab. Lasing was observed at a photonic band-edge, where the group velocity was significantly small near the K point of the band structure having a triangular lattice. Lasing was ... [Opt. Express 17, 640-648 (2009)]

Leonard K. Hoffmann, Matthias Klinkmüller, Elvis Mujagić, Mykhaylo P. Semtsiv, Werner Schrenk, William T. Masselink, Gottfried Strasser
A monolithic coupling scheme for mid-infrared quantum cascade laser arrays is investigated with respect to brightness enhancement. The tree-shaped resonator enables parallel coupling of six laser elements into a single element by means of several Y-junctions. Phase-locking is observed on the basis ... [Opt. Express 17, 649-657 (2009)]

V. Kollárová, T. Medrik, R. Celechovský, V. Chlup, Z. Bouchal, A. Pochylý, M. Kalman, T. Kubina
In the paper, the geometrical parameters and energetics of the extremely narrow pseudo-nondiffracting beams with the spot size of several micrometers are examined. The main attention is focused on design, realization and testing of the set-up enabling conversion of the laser diode beam or the fiber ... [Opt. Express 17, 494-508 (2009)]

Vladimir Svrcek, Davide Mariotti, Michio Kondo
Even with intensive research, air-stable blue light emission from silicon nanocrystals (Si-ncs) at room temperature still remains a challenge. We show that stable and blue-luminescent Si-ncs can be produced by laser-generated plasma (nanosecond-pulsed excimer laser) confined in water. These Si-ncs ... [Opt. Express 17, 520-527 (2009)]

Li Zheng, Songsong Tang, Xianfeng Chen
We propose a method to broaden the cut-off region of high harmonic generation by optimizing the parameters of two-color laser fields synthesized by an intense 5 fs pulse at 800 nm and a relatively weak, subharmonic pulse at 2400 nm. Simulated Annealing (SA) algorithm is employed to optimize the ... [Opt. Express 17, 538-543 (2009)]

Eduardo Granados, Helen M. Pask, David J. Spence
We demonstrate the operation of a continuous-wave (CW) picosecond yellow laser operating at 559 nm. A solid-state Raman laser using a KGW crystal was synchronously pumped by an 80 MHz laser operating at 532 nm. The output pulses were compressed from 10 ps at 532 nm down to 3.2 ps at 559 nm, ... [Opt. Express 17, 569-574 (2009)]

Ting Lei, Fuyun Lu, Chenghou Tu, Yixin Deng, Enbang Li
A theoretical model is established to study the self-similar pulses in nonlinear polarization evolution (NPE) mode-locked fiber lasers. The propagation of pulse in single mode fibers and gain fibers are described by coupled Ginzburg- Landau equation (GLE). Two wave plates and a polarizer are ... [Opt. Express 17, 585-591 (2009)]

Ciro D'Amico, Marc Tondusson, Jérome Degert, Eric Freysz
Spatially shaped femtosecond laser pulses are used to generate and to focus tunable terahertz (THz) pulses by Optical Rectification in a Zinc Telluride (ZnTe) crystal. It is shown analytically and experimentally that the focusing position and spectrum of the emitted THz pulse can be changed, in the ... [Opt. Express 17, 592-597 (2009)]

Frank C. De Lucia, Jennifer L. Gottfried, Andrzej W. Miziolek
Recently laser-induced breakdown spectroscopy (LIBS) has
been investigated as a potential technique for trace explosive detection.
Typically LIBS is performed using nanosecond laser pulses. For this work,
we have investigated the use of femtosecond laser pulses for explosive
residue detection ... [Opt. Express 17, 419-425 (2009)]

Malte Duering, Vesselin Kolev, Barry Luther-Davies
We describe a 5.5W 589nm source based on a passively mode-locked
Nd:YVO4 laser and a multi-stage Lithium Triborate optical
parametric amplifier seeded by a tuneable semiconductor laser. We show
this system can produce rapidly tuneable, transform-limited pulses in near
diffraction-limited beams ... [Opt. Express 17, 437-446 (2009)]