Tunable Diode Laser Spectroscopy: An Invited Review

Eng, R. S.; Butler, J.F.; Linden, Kurt J.

doi:10.1117/12.7972642

Cited by 91 publications

(23 citation statements)

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“…Tunable diode laser (TDL) absorption spectroscopy utilizes the highly specific mid-infrared (IR) absorption characteristics of trace gas molecules to measure the concentration of a desired species in a sample (Eng et al, 1980). TDLs emit monochromatic radiation that may be tuned at a high frequency and resolution.…”

Section: Introductionmentioning

confidence: 99%

“…TDLs emit monochromatic radiation that may be tuned at a high frequency and resolution. This allows for fast and sensitive measurement of trace gas concentrations using a highly focused absorption line (Eng et al, 1980). Most trace gas detection is accomplished using lead-salt diode lasers, which, as a group, can produce light in the wavelength region of 2.5-25 mm (Werle et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

“…The TDL-based system operates at low pressures ($5 kPa), which decreases broadening of absorption lines from gas molecule collisions in the sample cells. This decrease in line broadening allows for more selective detection of NH 3 absorption lines by decreasing interference with other gases at nearby wavelengths (Eng et al, 1980). Low pressure within the TGA and sample tubing also lowers the partial pressure of water vapour in the system, greatly reducing the possibility of condensation.…”

Section: Introductionmentioning

confidence: 99%

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Technical note: Laboratory evaluation of a tunable diode laser system for eddy covariance measurements of ammonia flux

Brodeur

Warland

Staebler

et al. 2009

Agricultural and Forest Meteorology

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Technical note: Laboratory evaluation of a tunable diode laser system for eddy covariance measurements of ammonia flux

Brodeur

Warland

Staebler

et al. 2009

Agricultural and Forest Meteorology

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“…For years tunable lead salt diode lasers (TDL) have been used as light sources in the mid infrared (IR) spectral range between 3 and 20 μm, where characteristic absorption lines of many molecular species are normally located [3,4]. In particular infrared tunable diode laser absorption spectroscopy (IR-TDLAS) has been successfully applied for time resolved studies of CF-, CF 2 -radicals and C 2 F 4 as a stable reaction product in capacitively coupled radio frequency (rf) CF 4 /H 2 pulsed plasmas (13.56 MHz) [1]. Furthermore, based on the simultaneous monitoring of selected absorption lines, a novel method was developed for the time resolved determination of the rotational temperature of the CF 2 radical within a single plasma pulse [2].…”

Section: Introductionmentioning

confidence: 99%

Time resolved QCLAS measurements in pulsed cc-rf CF₄/H₂plasmas

Степанов

Welzel

Röpcke

et al. 2009

J. Phys.: Conf. Ser.

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Abstract. Fluorocarbon containing capacitively coupled radio frequency (cc-rf) plasmas are widely used in technical applications and as model systems for fundamental investigations of complex plasmas. Absorption spectroscopy based on pulsed quantum cascade lasers (QCL) was applied in the mid-IR spectral range of 1269-1275 cm -1 . Absolute densities of the precursor molecule CF 4 and of the stable product C 3 F 8 were measured with a time resolution of up to 1 ms in pulsed CF 4 /H 2 asymmetrical cc-rf (13.56 MHz) discharges. For this purpose both the non-negligible temperature dependence of the absorption coefficients and the interference of the absorption features of CF 4 and C 3 F 8 had to be taken into account in the target spectral range. Therefore, at two different spectral positions composite absorption spectra were acquired under the same plasma conditions in order to discriminate between CF 4 and C 3 F 8 contributions. A total consumption of ~ 12 % was observed for CF 4 during a 1 s plasma pulse, whereas C 3 F 8 appeared to be produced mainly from amorphous fluorocarbon layers deposited at the reactor walls. A gas temperature increase by ~ 100 K in the plasma pulse was estimated from the measurements. Additionally, not yet identified unresolved absorption (potentially from the excited CF 4 molecule) was found during the 'on-phase'.

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“…The problem of calculating excited state populations in hydrogenic plasmas was first addressed in Reference (10). In this study photoionization of atoms and ions was neglected with relation is the reduced radiation temperature in electron volts, and Ei(x) is the exponential integral.…”

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confidence: 99%

Identification of New Potential Scientific and Technology Areas for DoD Application. Summary of Activities

Ca¹

1983

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The views and conclusions contained in this document are those of the authors and should not be interpreted as Cl.necessarily representing the official policies either express or implied, of the Defense Advanced Research Projects Agency or the United States Government. MDA-903-82-C-0376The vi-~ws and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies either express or implied, of the Defense Advanced Research Project-,, Agency or the United States Government. I"b.--I. INTRODUCTIONIn his statement to the 97th Congress the Director of DARPA gave this motivation for technology search activities as part of the technology base (6.1/6.2) programs:"With the current emphasis on achieving technological superiority to offset Warsaw Pact weapons and manpower, it is imperative that DOD be cognizant of the military-oriented research and 4development work that is being conducted by industry and universities that are beyond the purview of DOD. DARPA has, therefore, established a program to aggressively search for and exploit evolving commercial and university research that has military applications. This program, in effect, increases the level of military R&D funding or extends the effect of existing research resources by introducing new and creative ideas into the DOD mainstream--ideas that might have never surfaced without extensive duplicative DOD efforts."The La Jolla Institute has assisted DARPA in the attainment of the above goal by identifying new scientific and technology areas being pursued at universities that have a potential for DOD applications, and in particular, those that might impact on existing programs or serve as the basis of future programs. This information, prepared by La Jolla Institute staff, Associates, and contacts in universities, is submitted in the form of reviews ("white papers") and presentations. Occasionally such anticipate needs. The latter has.been illustrated this year in several respects as outlined below.One of these, drawing on in-house expertise, discussed matters relevant both to laser propagation in the atmosphere as well as to laser beam clean-up in Raman amplifiers. Another report, for high-power lasers, quite a few of which were first described by Soviet workers. It is possible that a new program will develop in this area as a result of this briefing.The above touches only on the highlights of this year's program, which is summarized below. Also included are copies of the reports generated.o,.ACTIVITY SUMMARY 2) An ET deployed at 500 km will orient itself long-end 1.perpendicular to its trajectory, hence experience drag and decay within a few years. To stabilize it so that it is in a minimum drag configuration the tether concept-has been suggested by Columbo. 4 Further study of the Columbo group's work is required, Draper Labs being an obvious choice. First for the trade-off between deploying at -500 kilometers with a tether and putting it at -600 kilometers with no tether, secondly, if ...

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Tunable Diode Laser Spectroscopy: An Invited Review

Cited by 91 publications

References 0 publications

Technical note: Laboratory evaluation of a tunable diode laser system for eddy covariance measurements of ammonia flux

Technical note: Laboratory evaluation of a tunable diode laser system for eddy covariance measurements of ammonia flux

Time resolved QCLAS measurements in pulsed cc-rf CF₄/H₂plasmas

Identification of New Potential Scientific and Technology Areas for DoD Application. Summary of Activities

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Tunable Diode Laser Spectroscopy: An Invited Review

Cited by 91 publications

References 0 publications

Technical note: Laboratory evaluation of a tunable diode laser system for eddy covariance measurements of ammonia flux

Technical note: Laboratory evaluation of a tunable diode laser system for eddy covariance measurements of ammonia flux

Time resolved QCLAS measurements in pulsed cc-rf CF4/H2plasmas

Identification of New Potential Scientific and Technology Areas for DoD Application. Summary of Activities

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Time resolved QCLAS measurements in pulsed cc-rf CF₄/H₂plasmas