Bruno Bousquet

Bruno Bousquet
University of Bordeaux · College of Science and Technology

PhD

About

141
Publications
19,795
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3,149
Citations
Introduction
My current research interests are LIBS, Raman and luminescence spectroscopies as well as spectra processing by chemometrics. I am curently involved in the NASA mission Mars 2020 as a member of the SuperCam team.
Additional affiliations
January 2018 - present
University of Bordeaux
Position
  • Professor (Full)
Description
  • I am working on LIBS, Raman and luminescence spectroscopies and on spectra processing by chemometrics. I am currently involved in the SuperCam team in the frame of the NASA Mars 2020 mission.
August 2011 - June 2012
University of Central Florida
Position
  • Research Associate
Description
  • As a Fulbright scholar, I worked on LIBS, laser filamentation and terahertz emission and detection.
September 2001 - January 2018
University of Bordeaux
Position
  • Professor (Associate)
Description
  • I have been working on LIBS and chemometrics, with applications such as polluted soils, agricultural soils, and cultural heritage artefacts. I have also been working in laser damage in the frame of the Laser Mega Joule project (CEA).
Education
October 1994 - December 1997
University of Bordeaux
Field of study
  • Physics

Publications

Publications (141)
Article
Prior to the Perseverance rover landing, the acoustic environment of Mars was unknown. Models predicted that: (i) atmospheric turbulence changes at centimeter scales or smaller at the point where molecular viscosity converts kinetic energy into heat1, (ii) the speed of sound varies at the surface with frequency2,3, and (iii) high frequency waves ar...
Article
Full-text available
The SuperCam instrument on the Perseverance Mars 2020 rover uses a pulsed 1064 nm laser to ablate targets at a distance and conduct laser induced breakdown spectroscopy (LIBS) by analyzing the light from the resulting plasma. SuperCam LIBS spectra are preprocessed to remove ambient light, noise, and the continuum signal present in LIBS observations...
Article
Full-text available
On the NASA 2020 rover mission to Jezero crater, the remote determination of the texture, mineralogy and chemistry of rocks is essential to quickly and thoroughly characterize an area and to optimize the selection of samples for return to Earth. As part of the Perseverance payload, SuperCam is a suite of five techniques that provide critical and co...
Article
Full-text available
The SuperCam instrument suite provides the Mars 2020 rover, Perseverance, with a number of versatile remote-sensing techniques that can be used at long distance as well as within the robotic-arm workspace. These include laser-induced breakdown spectroscopy (LIBS), remote time-resolved Raman and luminescence spectroscopies, and visible and infrared...
Article
In the context of laser-induced breakdown spectroscopy (LIBS), plasma-induced luminescence (PIL) may be observed by tuning the temporal acquisition parameters (delay and gate). This approach provides useful information about minor elements in a sample. The broad range of excitation resulting from the laser-induced plasma enables the simultaneous ob...
Article
The SuperCam instrument suite onboard the Mars 2020 Perseverance rover includes a microphone used to complement Laser-Induced Breakdown Spectroscopy investigations of the surface of Mars. The potential of the SuperCam microphone has already been demonstrated for laser ablation under Earth atmosphere in our preliminary study with a small set of samp...
Article
Full-text available
Suite aux succès de l’outil ChemCam, le prochain rover martien Perseverance comprend un nouvel instrument franco-américain, SuperCam, qui couple la LIBS à la spectroscopie Raman ainsi qu’à la spectroscopie infrarouge passive. Grâce à la corrélation des données atomiques et moléculaires obtenues, SuperCam permettra de caractériser la chimie des sols...
Article
Full-text available
Les sources laser nanosecondes ainsi que les spectromètres optiques ont atteint un niveau de compacité tel que cela a conduit au développement et à la commercialisation de pistolets LIBS. Avec une autonomie de plusieurs heures, ces dispositifs permettent de réaliser, hors du laboratoire, de nombreuses analyses élémentaires semiquantitatives de la p...
Article
Since the 2000s, the analytical potential of laser-induced breakdown spectroscopy (LIBS) has been growing steadily. This is explained by the many advantages it provides such as its sensitivity, its speed of acquisition, but also the possibility of analyzing most samples as they are without preparation. Like many spectroscopies in the framework of q...
Presentation
Les dents sont l’un des matériaux les mieux préservés des assemblages archéologiques et paléoanthropologiques. Les tissus dentaires, tels que l'émail et la dentine, se forment par couches superposées qui seront préservées tout au long de la vie de l’individu. Cette séquence de couches contient l’enregistrement d'informations uniques sur de la traje...
Article
Despite well-established advantages and a growing number of applications, laser-induced breakdown spectroscopy (LIBS) still fails to be recognized as a robust analytical technique, especially because many factors varying from an experimental setup to the other are preventing from any inter-comparison. The present paper is a guideline for increasing...
Article
As it is the case for any spectroscopic technique, laser-induced breakdown spectroscopy (LIBS) is strongly influenced by the signal fluctuations, and the LIBS spectra need to be normalized to obtain enhanced analytical performance. Nowadays, normalization in LIBS remains an open question and, in the present review, the normalization methods commonl...
Article
Full-text available
Owing to their relatively high resistance to laser-induced damage, hafnia and silica are commonly used in multilayered optical coatings in high-power laser facilities as high- and low-refractive-index materials, respectively. Here, we quantify the laser-induced-damage threshold (LIDT) at 1053 nm in the short-pulse regime of hafnia and silica monola...
Conference Paper
Full-text available
The heritage of all rock art must be preserved and studied at the same time. Research and preservation are closely linked, and this forms the basis of this session. The interdisciplinary aspect of research is an integral part of the processes of conservation. To preserve without studying does not make sense and may even increase the risks to sites....
Article
Numerous prehistoric populations around the world have made intensive use of the conchoidal properties of obsidian, a volcanic glass, to make tools and weapons. For archaeologists, knowing the geological origin of these artifacts is vital to reconstruct population movements and interactions. In this paper, we discuss the results obtained by Laser-I...
Article
In preparation for the SuperCam/Mars Microphone scientific investigation, the acoustic signal associated with the plasma formation during Laser-Induced Breakdown Spectroscopy (LIBS) experiment is studied with regard to the shot-to-shot evolution of the laser induced crater morphology and plasma emission lines. A set of geological targets are depth...
Conference Paper
Full-text available
Acoustic signal associated with the plasma formation during LIBS under Mars atmosphere is studied with regard to the evolution of the laser induced pit volume.
Conference Paper
Full-text available
We demonstrate that it is possible to focalise a LIBS setup by listening to laser sparks.
Conference Paper
The robust-optimization algorithm is validated for the laser-induced damage threshold of multilayer-dielectric mirrors. The robust design approach shows a significant improvement compared to the classical design, validating our calculation method.
Article
When Laser-Induced Breakdown Spectroscopy (LIBS) spectra exhibit complex spectral features as the result of two or more overlapping emission lines, it is common to apply multi-peak fitting in order to extract the relevant information. In this paper, we propose an alternative method to multi-peak fitting based on advanced data processing. To illustr...
Article
Full-text available
Cave Art is a fragile testimony of past human societies and the development of modern behaviours. In limestone caves, moonmilk commonly endanger the artworks. It is a calcite deposit known to present a large variability of chemical composition and morphological structures, hosting numerous microbial communities. The possibility to characterize this...
Article
Geological studies increasingly require highly sensitive elemental techniques able to image the distribution of elements in minerals with microscopic-scale resolution. In this paper, we present an evaluation of megapixel laser-induced breakdown spectroscopy (LIBS) imaging for the geological characterization of minerals. The study is conducted on a...
Article
Full-text available
We report on a numerical optimization of the laser induced damage threshold of multi-dielectric high reflection mirrors in the sub-picosecond regime. We highlight the interplay between the electric field distribution, refractive index and intrinsic laser induced damage threshold of the materials on the overall laser induced damage threshold (LIDT)...
Article
Full-text available
A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has been fixed in the paper.
Article
Full-text available
Laser-Induced Breakdown Spectroscopy (LIBS) has achieved promising performance as an elemental imaging technology, and considerable progress has been achieved in the development of LIBS over the last several years, which has led to great interest in the use of LIBS in various fields of applications. LIBS is a highly attractive technology that is di...
Article
In this study, a collaborative contest focused on LIBS data processing has been conducted in an original way since the participants did not share the same samples to be analyzed on their own LIBS experiments but a set of LIBS spectra obtained from one single experiment. Each participant was asked to provide the predicted concentrations of several e...
Article
Our research deals with the evolution of wall surfaces in prehistoric caves. The focus of this paper is dedicated to the structural and chemical characterization of a white concretion partially covering some walls in caves. In one of the caves, a non-ornate one which became a laboratory-cave (the Leye cave at Marquay, Dordogne, France) located in t...
Article
On Mars, Laser-Induced Breakdown Spectroscopy (LIBS) as performed by the ChemCam instrument can be used to measure the hydrogen content of targets in situ, under a low pressure CO2 atmosphere. However, unexpected variations observed in the Martian dataset suggest an effect related to target roughness. Here, we present a series of laboratory experim...
Conference Paper
Full-text available
Practical work in optics allows supporting the construction of knowledge, in particular when the concept to be learned remains diffuse. To overcome the limitations of the current experimental setups, we have designed a hybrid system that combines physical interaction and numerical simulation. This system relies on 3D-printed replicas of optical ele...
Article
We investigate the interest of deep wet etching with HF/HNO3 or KOH solutions as a final step after polishing to improve fused silica optics laser damage resistance at the wavelength of 351 nm. This comparison is carried out on scratches engineered on high damage threshold polished fused silica optics. We evidence that both KOH and HF/HNO3 solution...
Patent
The invention concerns a hybrid simulator (100) for teaching optics or for training adjustment of an optical device.According to the invention, the hybrid simulator (100) comprises at least one dummy optical component (10) physically simulating an optical device, at least one actuator device (30) for generating or simulating an adjustment of said d...
Article
Full-text available
Cave walls are affected by different kinds of alterations involving preservative issues in the case of ornate caves, in particular regarding the rock art covering the walls. In this context, coralloids correspond to a facies with popcorn-like aspect belonging to the speleothem family, mostly composed of calcium carbonate. The elemental characteriza...
Article
Full-text available
In most archaeological researches, ceramic cathodoluminescence images are conventionally exploited in a descriptive way (paste colour, inclusions). In this study, a new approach was employed: image's RGB histograms were used in order to differentiate several ceramics recently discovered at the archaeological site of San José de Moro located in nort...
Conference Paper
We tested KOH solution as an alternative to HF solution for deep etching operation on fused silica optics. KOH and HF solutions gave very high laser damage resistance on scratches but surface quality is not deteriorated by KOH solution.
Article
Full-text available
We present a theoretical investigation of terahertz (THz) generation in laser-induced gas plasmas. The work is strongly motivated by recent experimental results on micro-plasmas, but our general findings are not limited to such a configuration. The electrons and ions are created by tunnel-ionization of neutral atoms, and the resulting plasma is hea...
Article
In this work, the polishing-induced contamination layer at the fused silica optics surface was studied with various interface analysis techniques: Secondary Ion Mass Spectroscopy (SIMS), Electron Probe Microanalysis (EPMA), X-Ray Photoelectron Spectroscopy (XPS), and Inductively Coupled Plasma—Optical Emission Spectroscopy (ICP-OES). Samples were p...
Article
In this study, multi-block analysis was applied for the first time to LIBS spectra provided by a portable LIBS system (IVEA Solution, France) equipped with three compact Czerny-Turner spectrometers covering the spectral ranges 200–397 nm, 398–571 nm and 572–1000 nm. 41 geological samples taken from a laboratory-cave situated in the “Vézère valley”,...
Article
Full-text available
Absorption spectra of explosives such as hexahydro-1,3,5-trinitro- 1,3,5-triazine (RDX), pentaerythritol tetranitrate (PETN), and mixtures of both were measured by terahertz time domain spectroscopy (THz-TDS). Chemometrics was applied to quantitative analysis of terahertz absorbance spectra obtained in transmission mode to predict the relative amou...
Conference Paper
Full-text available
Detection of explosives has always been a priority for homeland security. Jointly, terahertz spectroscopy and imaging are emerging and promising candidates as contactless and safe systems. In this work, we treated data resulting from hyperspectral imaging obtained by THz-time domain spectroscopy, with chemometric tools. We found efficient identific...
Article
Quantitative measurements of the angular distribution of the plasma line emission from a gallium arsenide (GaAs) target irradiated by a single laser-air filament are reported. These enable reliable estimates of the stand-off ranges possible with single-filament-induced laser-induced breakdown spectroscopy materials detection.
Conference Paper
Chemometric analysis was applied on terahertz absorbance 3D images, in transmission. The goal is to automatically discriminate some explosives on images and quantify mixtures of RDX/PETN in the frequency range of 0.2–3 THz. Partial Least Square (PLS) was applied on THz absorbance multispectral images to quantify individual product inside pure sampl...
Conference Paper
Full-text available
Experiments in optics are essential for learning and understanding physical phenomena. The problem with these experiments is that they are generally time consuming for both their construction and their maintenance, potentially dangerous through the use of laser sources, and often expensive due to high technology optical components. We propose to si...
Conference Paper
Full-text available
Terahertz (THz) tomography is a recent imaging technique allowing 3D inspection of opaque objects. In this paper, we investigate a dual-energy experimental setup and a THz tomographic reconstruction algorithm based on dual-energy measurements. We discuss how this dual-energy approach is able to extract physical properties of acquired samples in add...
Conference Paper
Full-text available
Time domain THz spectroscopy and 3D imaging are used for non-destructive analyses of modern pottery which was made using ancient and traditional technology. Our study demonstrates that the internal structure of this of Pre-Columbian civilizations Mochica type pottery can be revealed with the help of X-Ray images used as references.
Article
Full-text available
The temporal evolution of the Laser Induced Breakdown (LIBS) signal of a pure aluminum sample was studied under nitrogen and air atmospheres. In addition to the usual decrease of signal due to plasma cooling, unexpected temporal evolutions were observed for a spectral lines of aluminum, which revealed the existence of collisional energy transfer ef...
Article
Artificial neural networks were applied to process data from on-site LIBS analysis of soil samples. A first artificial neural network allowed retrieving the relative amounts of silicate, calcareous and ores matrices into soils. As a consequence, each soil sample was correctly located inside the ternary diagram characterized by these three matrices,...
Article
Chemometrics was applied to qualitative and quantitative analyses of terahertz spectra obtained in transmission mode. A series of mixtures of three pure products, namely citric acid, D-(-) fructose and α-lactose monohydrate under various concentrations were prepared as pressed pellets with polyethylene as binder. Then terahertz absorbance spectra w...
Article
Full-text available
Terahertz and millimeter waves penetrate various dielectric materials, including plastics, ceramics, crystals, and concrete, allowing terahertz transmission and reflection images to be considered as a new imaging tool complementary to X-Ray or Infrared. Terahertz imaging is a well-established technique in various laboratory and industrial applicati...
Article
Full-text available
Glasses specifically tailored with photosensitive agents such as silver are efficient material for direct laser writing localized linear and non linear optical properties. The relation between the photo-induced structures and the modifications of the linear and optical properties are discussed.
Conference Paper
Thomson scattering is reported for the first time to measure electron density and temperature of aluminum laser plasma in air. Electron and excitation temperatures are compared to discuss local thermodynamic equilibrium in such plasmas.