Topics in Photonics

Menzel, Ralf

doi:10.1007/978-3-662-04521-3_1

Cited by 6 publications

(11 citation statements)

References 309 publications

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“…(Equations given in this paper are referenced by the number of the table in which they appear, i.e., T2.#.) According to the classical definition of the properties of light (see, for example, Menzel, 59 pp. 52-61), the relation between power (P), intensity (I), and energy (E) is given by Eqs.…”

Section: Characterization Of the Laser Parameters And The Ablation Prmentioning

confidence: 99%

“…The beam parameter product is the product of the beam divergence h and the beam waist w 0 . 59 All the above parameters enter the expression T2.12, which allows the irradiance reaching the target to be calculated. It can be seen that the irradiance on the sample decreases as M 2 increases from unity (.1).…”

Section: Characterization Of the Laser Parameters And The Ablation Prmentioning

confidence: 99%

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Laser-Induced Breakdown Spectroscopy (LIBS), Part I: Review of Basic Diagnostics and Plasma—Particle Interactions: Still-Challenging Issues within the Analytical Plasma Community

2010

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Laser-induced breakdown spectroscopy (LIBS) has become a very popular analytical method in the last decade in view of some of its unique features such as applicability to any type of sample, practically no sample preparation, remote sensing capability, and speed of analysis. The technique has a remarkably wide applicability in many fields, and the number of applications is still growing. From an analytical point of view, the quantitative aspects of LIBS may be considered its Achilles' heel, first due to the complex nature of the laser–sample interaction processes, which depend upon both the laser characteristics and the sample material properties, and second due to the plasma–particle interaction processes, which are space and time dependent. Together, these may cause undesirable matrix effects. Ways of alleviating these problems rely upon the description of the plasma excitation-ionization processes through the use of classical equilibrium relations and therefore on the assumption that the laser-induced plasma is in local thermodynamic equilibrium (LTE). Even in this case, the transient nature of the plasma and its spatial inhomogeneity need to be considered and overcome in order to justify the theoretical assumptions made. This first article focuses on the basic diagnostics aspects and presents a review of the past and recent LIBS literature pertinent to this topic. Previous research on non-laser-based plasma literature, and the resulting knowledge, is also emphasized. The aim is, on one hand, to make the readers aware of such knowledge and on the other hand to trigger the interest of the LIBS community, as well as the larger analytical plasma community, in attempting some diagnostic approaches that have not yet been fully exploited in LIBS.

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Section: Characterization Of the Laser Parameters And The Ablation Prmentioning

confidence: 99%

Section: Characterization Of the Laser Parameters And The Ablation Prmentioning

confidence: 99%

Laser-Induced Breakdown Spectroscopy (LIBS), Part I: Review of Basic Diagnostics and Plasma—Particle Interactions: Still-Challenging Issues within the Analytical Plasma Community

2010

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“…The magnitude of uncompensated depolarization in such a scheme is proportional to 2 B to a high accuracy ( fig. 2b and fig.…”

Section: Resultsmentioning

confidence: 97%

“…The arising temperature gradient leads to strain and, as a consequence, to changes in the permittivity tensor (photoelastic effect). Therefore, an initially isotropic medium (glass, cubic crystals or ceramics of cubic crystals) becomes anisotropic and there appears birefringence [1][2]. (The photoelastic effect does not occur in liquids and gases.)…”

Section: Introductionmentioning

confidence: 97%

“…Media with cubic nonlinearity are characterized [1][2] by linear dependence of refractive index on intensity n(I)=n 0 +γ NL I, where n 0 is linear index of refraction, γ NL is the characteristic of a nonlinear medium, and I is radiation intensity. В-integral, i.e., the nonlinear phase incursion in a medium with length L, is taken as a measure of nonlinearity:…”

Section: Introductionmentioning

confidence: 99%

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Theoretical investigation of negative influence of the cubic nonlinearity and induced birefringence on developing and using contemporary PW lasers systems

Kochetkova¹,

Martyanov²,

Poteomkin³

et al. 2010

SPIE Proceedings

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A system of differential equations describing, neglecting diffraction, the propagation of laser radiation in a medium with birefringence and cubic nonlinearity is derived. It is shown that the efficiency of depolarization compensation by means of a 90° polarization rotator or a Faraday mirror decreases with increasing В-integral (nonlinear phase incursion). Comparison of the considered method effectiveness in the case of incident linear and circular polarization showed that for the circular polarization the optimal angle of polarization rotator is different from 90° and the degree of polarization is less than for the linear one.

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Proposal of an interferometric method for the transverse mode control of a laser

Harfouche

Aı̈t-Ameur

2013

J. Opt.

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We have demonstrated that the fundamental mode of a three-mirror laser cavity including a Michelson mirror (MM) can be single LGp0 like in shape with a mode order p controlled by the microscopic position of one of the MM mirrors. This new interferometric intra-cavity laser beam shaping technique presents the advantage, over the usual ones, of a certain agility in adjusting the transverse mode order since no realignment is required. We have given the first modelling, to the best of our knowledge, of a three-mirror cavity including an interferometric mirror allowing the determination of its fundamental mode by using a modal decomposition method.

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Topics in Photonics

Cited by 6 publications

References 309 publications

Laser-Induced Breakdown Spectroscopy (LIBS), Part I: Review of Basic Diagnostics and Plasma—Particle Interactions: Still-Challenging Issues within the Analytical Plasma Community

Laser-Induced Breakdown Spectroscopy (LIBS), Part I: Review of Basic Diagnostics and Plasma—Particle Interactions: Still-Challenging Issues within the Analytical Plasma Community

Theoretical investigation of negative influence of the cubic nonlinearity and induced birefringence on developing and using contemporary PW lasers systems

Proposal of an interferometric method for the transverse mode control of a laser

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