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Tunable Diode-Laser Absorption Spectroscopy for Trace-Gas Measurements with High Sensitivity and Low Drift

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Book Series: Karlsruhe Series in Photonics & Communications / Universität Karlsruhe (TH), Institute of High-Frequency and Quantum Electronics (IHQ) ISSN: 18651100 ISBN: 9783866443280 Year: Volume: 5 Pages: 142 p. DOI: 10.5445/KSP/1000010030 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:02:02
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This book discusses the mechanical and opto-electronic design of laser spectrometers for measuring two very important atmospheric gases, namely water vapor and its isotopic ratios, and formaldehyde. For measuring water vapor, shot-noise limited sensitivity has been achieved by a careful choice of system components and data processing. For measuring formaldehyde, a selective sample modulation exploiting the Stark effect has been used to greatly improve the sensitivity.

Spectral Line Shapes in Plasmas

ISBN: 9783906980812 9783906980829 Year: Pages: 232 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Physics (General)
Added to DOAB on : 2015-10-22 07:51:31
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Line-shape analysis is one of the most important tools for diagnostics of both laboratory and space plasmas. Its reliable implementation requires sufficiently accurate calculations, which imply the use of analytic methods and computer codes of varying complexity, and, necessarily, varying limits of applicability and accuracy. However, studies comparing different computational and analytic methods are almost non-existent. The Spectral Line Shapes in Plasma (SLSP) code comparison workshop series [1] was established to fill this gap. Numerous computational cases considered in the two workshops organized to date (in April 2012 and August 2013 in Vienna, Austria) not only serve the purpose of code comparison, but also have applications in research of magnetic fusion, astrophysical, laser-produced plasmas, and so on. Therefore, although the first workshop was briefly reviewed elsewhere [2], and will likely be followed by a review of the second one, it was unanimously decided by the participants that a volume devoted to results of the workshops was desired. It is the main purpose of this special issue.

Symmetry in Quantum Optics Models

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ISBN: 9783039218585 9783039218592 Year: Pages: 92 DOI: 10.3390/books978-3-03921-859-2 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Physics (General)
Added to DOAB on : 2019-12-09 16:39:37
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Prototypical quantum optics models, such as the Jaynes–Cummings, Rabi, Tavis–Cummings, and Dicke models, are commonly analyzed with diverse techniques, including analytical exact solutions, mean-field theory, exact diagonalization, and so on. Analysis of these systems strongly depends on their symmetries, ranging, e.g., from a U(1) group in the Jaynes–Cummings model to a Z2 symmetry in the full-fledged quantum Rabi model. In recent years, novel regimes of light–matter interactions, namely, the ultrastrong and deep-strong coupling regimes, have been attracting an increasing amount of interest. The quantum Rabi and Dicke models in these exotic regimes present new features, such as collapses and revivals of the population, bounces of photon-number wave packets, as well as the breakdown of the rotating-wave approximation. Symmetries also play an important role in these regimes and will additionally change depending on whether the few- or many-qubit systems considered have associated inhomogeneous or equal couplings to the bosonic mode. Moreover, there is a growing interest in proposing and carrying out quantum simulations of these models in quantum platforms such as trapped ions, superconducting circuits, and quantum photonics. In this Special Issue Reprint, we have gathered a series of articles related to symmetry in quantum optics models, including the quantum Rabi model and its symmetries, Floquet topological quantum states in optically driven semiconductors, the spin–boson model as a simulator of non-Markovian multiphoton Jaynes–Cummings models, parity-assisted generation of nonclassical states of light in circuit quantum electrodynamics, and quasiprobability distribution functions from fractional Fourier transforms.

Spectral Line Shapes in Astrophysics and Related Topics

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ISBN: 9783039281688 9783039281695 Year: Pages: 268 DOI: 10.3390/books978-3-03928-169-5 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Physics (General) --- Astronomy (General)
Added to DOAB on : 2020-04-07 23:07:08
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Spectral lines, widths, and shapes are powerful tools for emitting/absorbing gas diagnostics in different astrophysical objects (from the solar system to the most distant objects in the universe—quasars). On the other hand, experimental and theoretical investigations of laboratory plasma have been applied in spectroscopic astrophysical research, especially in research on atomic data needed for line shape calculations. Data on spectral lines and their profiles are also important for diagnostics, analysis, and the modelling of fusion plasma, laser-produced plasma, laser design and development, and various plasmas in industry and technology, like light sources based on plasmas or the welding and piercing of metals by laser-produced plasma. The papers from this book can be divided into four groups: 1. stark broadening data for astrophysical and laboratory plasma investigations; 2. applications of spectral lines for astrophysical and laboratory plasma research; 3. spectral line phenomena in extragalactic objects, and 4. laboratory astrophysics results for spectra investigation. The reviews and research papers, representing new research on the topics presented in this book, are of interest for specialists and PhD students. We hope that the present book will be useful and interesting for scientists interested in the investigation of spectral line shapes and will contribute to the education of young researchers and PhD students.

Keywords

stark broadening --- atomic data --- subdwarfs B stars --- Ar II --- stark broadening --- atomic data --- atomic processes --- line profiles --- Ar VII --- stark broadening --- line profiles --- atomic data --- Na IV --- atomic/molecular data --- radiative and collisional processes --- stars --- stark broadening --- impact approximation --- numerical simulation --- ionization processes --- emission line formation --- atomic spectroscopy --- supermassive black holes --- emission line profiles --- quasars --- line shape --- wave collapse --- electric field solitons --- plasma turbulence --- line shapes --- stark broadening --- neutral broadening --- corona discharge --- line shapes --- Stark broadening --- Zeeman effect --- tokamaks --- white dwarfs --- active galaxies --- BL Lacertae objects --- AO 0235+164 --- photometry --- polarimetry --- plasma spectroscopy --- microwave discharges --- gas temperature --- stark broadening parameters --- atomic emission spectroscopy --- laboratory plasma --- spectra --- line profiles --- astrophysical plasmas --- inner plasma electrostatic screening --- different charged ions --- stars --- galaxies: active --- galaxies: nuclei --- line: profiles --- quasars: emission lines --- catalogs --- surveys --- line shapes --- Stark broadening --- Zeeman effect --- white dwarfs --- QSO samples --- QSO selection --- medium-band photometry --- electron scattering --- cross sections --- Rosetta mission --- atomic and molecular databases --- Stark broadening --- line profiles --- atomic data --- spectroscopy --- alkali atoms --- astrophysics --- atomic processes --- molecular processes --- radiative transfer --- absorption quasi-molecular bands --- sun:atmosphere --- sun:photosphere --- stars:atmospheres --- white dwarfs --- atomic processes --- radiative transfer --- Sun: atmosphere --- Sun: photosphere --- stars: atmospheres --- white dwarfs --- Stark effect --- electron broadening --- Lienard-Wiechert --- retarded interaction --- relativistic collision operator --- Stark broadening --- line profiles --- atomic data --- plasmas --- Maxwell --- Juttner-Maxwell --- relativistic --- Doppler effect --- asymmetry --- Stark broadening --- Ar VII line profiles --- stars --- white dwarfs --- atomic data --- scattering

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