Virtual Journal of Laser

Mid-infrared lasers

Fri, 30 Jul 2010 04:00:44 +0000

Mid-infrared lasers

Nature Photonics 4, 576 (2010). doi:10.1038/nphoton.2010.173

Author:

The development of efficient and convenient mid-infrared sources based on quantum cascade lasers and nonlinear optics is creating possibilities for spectroscopy and sensing, reports The Scott Partnership.

Recent progress in lasers on silicon

Fri, 30 Jul 2010 00:00:00 +0000

Recent progress in lasers on silicon

Nature Photonics 4, 511 (2010). doi:10.1038/nphoton.2010.167

Authors: Di Liang & John E. Bowers

Terahertz technology: Towards THz integrated photonics

Fri, 30 Jul 2010 04:00:44 +0000

Terahertz technology: Towards THz integrated photonics

Nature Photonics 4, 503 (2010). doi:10.1038/nphoton.2010.169

Author: Heinz-Wilhelm Hübers

The demonstration of an integrated terahertz transceiver featuring a quantum cascade laser and a Schottky diode mixer promises new applications for compact and convenient terahertz photonic instrumentation.

Mode-locked lasers: Light condensation

Fri, 30 Jul 2010 04:00:44 +0000

Mode-locked lasers: Light condensation

Nature Photonics 4, 502 (2010). doi:10.1038/nphoton.2010.182

Author: Andrea Fratalocchi

Common sense suggests that complex phenomena such as Bose–Einstein condensation require complicated experimental set-ups to be observed. But when it comes to the field of photonics, the simplest system may sometimes reveal the most unexpected surprises.

Low-level laser therapy supported teeth extractions of two patients receiving IV zolendronate

Wed, 28 Jul 2010 17:40:50 +0000

Abstract

BRONJ (bisphosphonate-related osteonecrosis of jaws) is a frequently encountered disease, particularly in the maxillofacial
region, and a consequence of bisphosphonate use. Treatment of BRONJ remains controversial, as efficiency of medical and surgical
approaches as well as a combination of these methods with supportive treatments have not been clearly demonstrated in the
literature. In recent years, laser usage alone or in combination with the main therapy methods, has become popular for the
treatment of bisphosphonate-related osteo-necrosis of jaws. In this article, we present the successful management of two dental
patients who had high potentials for BRONJ development as a result of chemo and radiotherapy combined with IV zoledronic acid
application. Multiple consecutive teeth extractions followed with primary wound closure and LLLT applications were performed
under high doses of antibiotics prophylaxis. Satisfactory wound healing in both the surrounding soft and hard tissues was
achieved.

Statistical analysis of parameter effects on bending angle in laser forming process by pulsed Nd:YAG laser

Thu, 29 Jul 2010 19:55:18 +0000

Publication year: 2010
Source: Optics & Laser Technology, In Press, Corrected Proof, Available online 29 July 2010
M., Hoseinpour Gollo , S.M., Mahdavian , H., Moslemi Naeini
In recent years, laser application has been introduced for bending and forming as new processes in manufacturing. The capability of laser bending demands more studies to recognize parameters influencing bending angle of sheet metals. In this study the effects of parameters such as material, laser power, beam diameter, scan velocity, sheet thickness, pass number and pulse duration on bending angle were studied by FEM initially and then followed by experiments. Furthermore, the Taguchi experimental design method was employed to pin point parameters, which significantly affect the bending process of laser bending of St12 and 304 alloy steels, which have a...

Spin modulation in semiconductor lasers

Thu, 29 Jul 2010 23:01:58 +0000

Jeongsu Lee, William Falls, Rafal Oszwaldowski, and Igor Zutic
We provide an analytic study of the dynamics of semiconductor lasers with injection (pump) of spin-polarized electrons, previously considered in the steady-state regime. Using complementary approaches of quasistatic and small signal analyses, we elucidate how the spin modulation in semiconductor las ... [Appl. Phys. Lett. 97, 041116 (2010)] published Thu Jul 29, 2010.

Voltage tunable photodetecting properties of LaCaMnO films grown on miscut LaSrAlO substrates

Thu, 29 Jul 2010 23:01:58 +0000

X. M. Li, K. Zhao, H. Ni, S. Q. Zhao, W. F. Xiang et al.
We report the voltage tunable photodetecting properties of a LaCaMnO film grown on miscut LaSrAlO (001) substrates under ultraviolet pulsed laser irradiation at ambient temperature. The photovoltage and photocurrent peak sensitivities can be tuned in the range of 0.2950.786 V/mJ and 0.1720.314 A/mJ, ... [Appl. Phys. Lett. 97, 044104 (2010)] published Thu Jul 29, 2010.

In situ assessment and minimization of nonlinear propagation effects for femtosecond-laser waveguide writing in dielectrics

Sun, 01 Aug 2010 00:00:00 +0000

Andrés Ferrer, Alexandro Ruiz de la Cruz, Daniel Puerto, Wojciech Gawelda, Juan A. Vallés, Miguel A. Rebolledo, Víctor Berdejo, Jan Siegel, Javier Solis
The effect of nonlinear propagation on the shape of the focal volume has been assessed by in situ plasma emission imaging during the subsurface processing of a commercial phosphate glass. The sample was processed with an elliptically shaped femtosecond-laser beam at 1 kHz repetition rate and ... [J. Opt. Soc. Am. B 27, 1688-1692 (2010)]

Generalized theory of double-resonance optical pumping of ^{4} He

Thu, 29 Jul 2010 04:00:00 +0000

Author(s): Michael K. Plante, Duncan L. MacFarlane, Douglas D. McGregor, Robert E. Slocum, William M. Sampson, and Andy W. Brown
We present extensions to the theory of double-resonance laser pumping of ^{4} He in the context of magnetometer instrumentation. This extended theory allows for arbitrary optical polarization, magnetic resonance (H_{1} ) coil orientation, and overall instrument orientation relative to the ambient ma...
[Phys. Rev. A 82, 013837] Published Thu Jul 29, 2010

Effects of the excitation density on the laser output of two differently doped Yb:YAG ceramics

Mon, 02 Aug 2010 00:00:00 +0000

Angela Pirri, Guido Toci, Daniele Alderighi, Matteo Vannini
We report the behavior of two Yb^3+ doped ceramics (i.e. 10% at. and 20% at.) under quasi-continuous wave laser pumping. Two different behaviors are found depending on the density of Yb^3+ in the excited level. Experimental results show that at low population inversion density, the maximum output ... [Opt. Express 18, 17262-17272 (2010)]

Multi-focus two-photon polymerization technique based on individually controlled phase modulation

Mon, 02 Aug 2010 00:00:00 +0000

Kotaro Obata, Jürgen Koch, Ulf Hinze, Boris N. Chichkov
Multi-focus two-photon polymerization with a spatial light modulator is demonstrated. The spatial light modulator generates multi-focus spots via phase modulation technique controlled by a computer generated hologram (CGH) pattern. Each focus spot can be individually addressed in position and laser ... [Opt. Express 18, 17193-17200 (2010)]

Effects of Nanometer-Scale Photonic Crystal Structures on the Light Extraction From GaN Light-Emitting Diodes