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Beam Quality (beam + quality)

Distribution by Scientific Domains
Physics and Astronomy66%
Chemistry33%

Selected Abstracts

Experimental investigation of laser power addition with composite four-mirror cavity

LASER PHYSICS LETTERS, Issue 1 2007
M. Lei
Abstract Beam combination is an effective geometry which can improve laser output power with good beam quality. A new and practical four-mirror cavity configuration is presented to combine the beams intracavity. This close-ended scheme is good at withstanding environmental perturbations and is easier to realize the alignment than the conventional Michelson cavity. The length of each arm can be rather short which makes the cavity more compact in practical implement. With this four-mirror cavity, the output brightness is efficiently improved compared to single F-P cavity laser by combining two Nd:YAG lasers. A single beam output exceeding 3.3 W is achieved in this composite cavity, which has the potential for scaling to much higher output power with high brightness. (© 2007 by Astro, Ltd. Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source]

Laser diodes semicircular side-pumped laser rod with a round-sharped output

LASER PHYSICS LETTERS, Issue 7 2006
Y. X. Guo
Abstract In order to keep the symmetric of the pump geometry and obtain a low-level, high quality laser output, the temperature of the side-pumped laser rod is more often be controlled by a water cooling system than a conduction cooling system in the diode-pumped solid-state lasers. But the use of the water cooling system increases the volume and decreases the mobility. To solve the confliction between the beam quality and the mobility of the laser system, a novel, compact and all-solid design of the pump structure is applied to the side-pumped laser system. The Nd:YAG rod is pumped by semicircular mounted LD arrays inthe pump module, and two pump modules are working together to compensate each other. Numerical calculation and experiment are performed, the output laser has a round-sharped beam with a beam waist of 5 mm and a divergence angle less than 7 mrad, and a maxim output pulse energy of 75.8 mJ is obtained under the working frequency of 20Hz, the slope efficiency is 35.8%. (© 2006 by Astro, Ltd. Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source]

Experimental study of a high-power CW diode-sidepumped Nd:YAG rod laser

LASER PHYSICS LETTERS, Issue 9 2005
F. Hajiesmaeilbaigi
Abstract In this paper we report on the characterization of a diode-side-pumped Nd:YAG rod laser operating at 300 W CW output power. The simulated and measured pump energy distributions in the crystal are compared. The thermal lens effect of the Nd:YAG have been experimentally investigated, and its influence on the performance of the laser are discussed. Output power and the beam quality of the laser under different resonator mirrors and rod end-face curvatures have been experimentally studied. The optical-to-optical and electrical-to-optical efficiencies are 28.5% and 11%, respectively. The beam parameter product is 40 mm · mrad and the instability of laser is about 3%. (© 2005 by Astro, Ltd. Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source]

A Beginner's Guide to Industrial Laser Beam Profiling

LASER TECHNIK JOURNAL, Issue 3 2010
how a Preventive Beam Profiling Strategy Helps to Save Money
Whether you're new to lasers or you've been working with them for some time, you may be wondering what all the fuss is over laser beam profiling. Why worry about the quality of the laser beam that you've just put into production? Or, if you think your process is humming along nicely, why fix what isn't broken? You might think that laser beam quality has more than likely been addressed at the research and development stage of the laser you have, or even at the manufacturing or integration stages of the system that you've received. This article shows the importance of laser beam profiling and how the user can benefit from it. [source]

The design of single particle laser mass spectrometers,

MASS SPECTROMETRY REVIEWS, Issue 2 2007
Daniel M. MurphyArticle first published online: 16 OCT 200
Abstract This review explores some of the design choices made with single particle mass spectrometers. Different instruments have used various configurations of inlets, particle sizing techniques, ionization lasers, mass spectrometers, and other components. Systematic bias against non-spherical particles probably exceeds a factor of 2 for all instruments. An ionization laser tradeoff is the relatively poor beam quality and reliability of an excimer laser versus the longer wavelengths and slower response time of an Nd-YAG laser. Single particle instruments can make special demands on the speed and dynamic range of the mass spectrometers. This review explains some of the choices made for instruments that were developed for different types of measurements in the atmosphere. Some practical design notes are also given from the author's experience with each section of the instrument. Published 2006 Wiley Periodicals, Inc., Mass Spec Rev 26:150,165, 2007 [source]

Supramolecular Dye Laser with Cucurbit[7]uril in Water

CHEMPHYSCHEM, Issue 1 2007
Jyotirmayee Mohanty Dr.
Green chemistry: A highly-efficient (,20,%) supramolecular dye laser, with excellent beam quality, is achieved by addition of the macrocyclic host molecule cucurbit[7]uril (CB7) to aqueous solutions of rhodamine 6G (see figure). In direct comparison to the conventional use of ethanol as solvent, the addition of CB7 improves also the photostability and thermo-optical behavior of the laser medium. [source]