Alexandre Parriaux
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alexandreparriaux.bsky.social
Alexandre Parriaux
@alexandreparriaux.bsky.social
37 followers 140 following 4 posts
Scientific collaborator at the Time and Frequency Laboratory, University of Neuchâtel.
I work on frequency combs, nonlinear optics, optical fibers, laser stabilization, and spectroscopy.
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alexandreparriaux.bsky.social
Just published in APL Photonics! We developed a new technique for stabilizing the repetition frequency of a QCL-comb. Our method offers a practical, high-bandwidth alternative to traditional electrical injection locking, with improved performance.
Non-resonant optical injection locking in quantum cascade laser frequency combs
Optical injection locking of the repetition frequency of a quantum cascade laser frequency comb is demonstrated using intensity modulated near-infrared light at
doi.org
June 18, 2025 at 8:40 AM
Reposted by Alexandre Parriaux
scienceetonnante.com
Nouveau billet ! D'OÙ VIENT L'ÉNERGIE DES AIMANTS ? On se demande comment un aimant fait pour en retenir un autre — voire carrément léviter — et ce sans source d'énergie apparente...le secret de l'énergie gratuite et infinie ?

scienceetonnante.substack.com/p/dou-vient-...
D'où vient l'énergie des aimants ?
Pourquoi un aimant peut-il en retenir un autre — voire carrément léviter ! — sans jamais s'user ou se vider...est-ce là le secret de l'énergie infinie ?
scienceetonnante.substack.com
March 28, 2025 at 6:08 AM
Reposted by Alexandre Parriaux
johnmdudley.bsky.social
Bad news from the US with the closure of atomic spectroscopy at NIST !!
tristancren.bsky.social Tristan Cren @tristancren.bsky.social · Mar 20
Latest news on the U.S. Federal Government's reorganization plan: the end of atomic spectroscopy at NIST, marking the end of a 120-year legacy...
Over the last 120 years, atomic and plasma spectroscopy was one of the most successful and visible directions of research at NIST. As a matter of fact, the very first scientific paper from the National Bureau of Standards (original NIST's name) back in 1904 was on spectra of mixed gases. Since then, the critically evaluated datasets and databases provided unique benchmarks to researchers across numerous fields of science and industry -- astronomy and astrophysics, medicine and Martian geology, lithography and nonproliferation. The advanced collisional-radiative codes allowed fast and accurate calculations of light emission from the hot matter of magnetic and inertial confinement fusion, laser-produced plasmas, solar corona, industrial plasmas. The precise measurements of spectra from neutral atoms to extremely charged ions helped discover many new exoplanets, accurately measure nuclear radii, develop new powerful diagnostic techniques. Unfortunately, the story of atomic spectroscopy at NIST is coming to an end. We were recently informed that unless there is a major change in the Federal Government reorganization plans, the whole Atomic Spectroscopy Group will be laid off in a few weeks, in particular, since our work is not considered to be statutorily essential for the NIST mission. In anticipation of this likely outcome, our primary goal at this moment is to preserve as much of the accumulated scientific knowledge as possible. We are currently discussing mirroring our atomic spectroscopy databases and online tools at other institutions and/or universities so that they will not become a slowly dying burden but rather continue to evolve and improve. Obviously, the most painful side of this development is the layoff of our extraordinary scientific and technical staff. Some of us plan to retire, others will hit the job market.
March 20, 2025 at 1:55 PM
Reposted by Alexandre Parriaux
inrap.fr
Des gaulois inhumés assis à Dijon (Côte-d'Or)

Une équipe de l’Inrap vient de mettre au jour des sépultures gauloises atypiques. Cette fouille a également livré une nécropole d’enfants de la période gallo-romaine et des vestiges allant jusqu'à la période contemporaine 👉 inrap.fr/des-gaulois-...
January 27, 2025 at 1:11 PM