Results 201 to 210 of about 17,184 (237)

Diode laser spectroscopy of carbon and oxygen stable isotopes in CO2

Optical Society of America Annual Meeting, 1991
Using tunable diode lasers it is possible to resolve individual rovibrational spectral lines within the vibrational bands of carbon dioxide and measure their absorbance. These measurements can be used to determine CO2 gas concentration and isotopic ratios of 13C/12C and 18O/16O.
Todd B. Sauke, Joseph F. Becker, Max Loewenstein, Vincent V. Dinh, Thomas D. Gutierrez   +4 more
openaire   +1 more source

Anode heating in an intense ion beam diode with a CO2 laser

Applied Physics Letters, 1984
In order to accelerate intense ion beams, we heat the anode of a pinch-reflex diode with a CO2 laser. At laser power densities of 1010 W/cm2 over a 2-mm focal spot, we demonstrate that gap closure is avoided and that ion efficiency is increased by at least a factor 3 over diode operation without the laser.
N. Camarcat, A. Devin, C. Peugnet, C. Patou   +3 more
openaire   +1 more source

Frequency-doubled CO_2 lidar measurement and diode laser spectroscopy of atmospheric CO_2

Applied Optics, 1983
A lidar instrument based on pulsed frequency-doubled carbon-dioxide lasers has been used at 4.88 microns for remote sensing of atmospheric carbon dioxide. A tunable-diode laser spectrometer provided the high-resolution spectroscopic data on carbon-dioxide line strength and line broadening needed for an accurate differential absorption measurement ...
J L, Bufton, T, Itabe, L L, Strow, C L, Korb, B M, Gentry, C Y, Weng   +5 more
openaire   +2 more sources

Detailed vibrational population distributions in a CO2 laser discharge as measured with a tunable diode laser

Applied Physics B Photophysics and Laser Chemistry, 1982
A tunable diode laser (TDL) operating in the 2150–2350 cm−1 wavenumber region is used to probe a conventional cw CO2 laser discharge. Absorption lines in more than 25 different vibrational bands are observed, enabling us to determine absolute vibrational populations inall levels of concern to the dynamics of the 10 μm CO2 laser. Levels in thev3 mode of
C. Dang, J. Reid, B. K. Garside
openaire   +1 more source

Energy efficiency of drilling granite and travertine with a CO2 laser and 980 nm diode laser

Applied Physics A, 2012
Using lasers to drill hard rock presents potential advantages compared to conventional mechanical drilling, such as higher penetration rates and reduced vibration. Before realistic drilling tools can be proposed, the influence of important parameters and the mechanisms involved in drilling different rocks with different lasers must be understood.
L. C. Guedes Valente, M. Angélica A. Pérez, Paula M. P. Gouvêa, C. Martelli, R. R. Avillez, Arthur M. B. Braga   +5 more
openaire   +1 more source

Laser machining of silicon using diode-pumped solid state & CO2 lasers

ICALEO 2002: 21st International Congress on Laser Materials Processing and Laser Microfabrication, 2002
Laser cutting and scribing of silicon has been investigated for a number of years but cut quality and speed problems have stopped the process gaining wide industrial acceptance. This process is now receiving more attention due to the advent of high average power ultra-violet diode-pumped solid-state lasers, whose reliability has been demonstrated in ...
T. Corboline, A. P. Hoult
openaire   +1 more source

Measurements of sulfur compounds in CO2 by diode laser atomic absorption spectrometry

Spectrochimica Acta Part B: Atomic Spectroscopy, 2003
Abstract Two simple methods for the analysis of the total concentration of sulfur in CO2 by diode laser atomic absorption spectrometry of excited, metastable sulfur atoms in a direct current discharge are presented. In the first method, the CO2 sample gas is mixed with the plasma gas (Ar or He) while the second is based on reproducible measurements ...
Franzke, J, Stancu, D.G, Niemax, K
openaire   +2 more sources

OPTIMIZATION OF CO2, FIBER AND DIODE LASER PARAMETERS FOR MARKING AND CUTTING THE CORK

HUMAN. ENVIRONMENT. TECHNOLOGIES. Proceedings of the Students International Scientific and Practical Conference, 2018
Nowadays, lasers are trying to use as many different industries and processes as possible due to their characteristics. One of the main uses of lasers is the cutting and marking of materials. The most common laser processed materials is wood and metal. Cork is one of the safest and easiest materials to process with laser but compared to wood and metal ...
Adijāns, Imants, Kažmere, Ieva, Lazov, Lyubomir   +2 more
openaire   +2 more sources

Diode Laser-based Sensor for High Precision Measurements of Ambient CO2

Laser Applications to Chemical, Security and Environmental Analysis, 2008
We report on the development of a high precision sensor for monitoring ambient CO2. Our TDL ICOS absorption spectrometer operates at 2 µm and achieves a precision of 1:3000 for the CO2 mixing ratio.
David Sonnenfroh, Krishnan Parameswaran, Mark Allen   +2 more
openaire   +1 more source

Response of a germanium tunnel diode to CO2 laser radiation.

1970
This item was digitized as part of a project to share McGill's intellectual legacy with the public. If you are the copyright holder or a relative of the copyright holder who is deceased, you may request withdrawal by emailing escholarship.library@mcgill.ca.
openaire   +1 more source