Degenerate four-wave mixing measurements were made on several Nd(3+)-doped laser materials by resonantly pumping the Nd(3+) ions. The dominant contribution to the signal under these conditions is associated with the difference in polarizabilities of the Nd(3+) ions in the metastable state versus the ground state. Absolute measurements of the signal strengths imply a laser-induced polarizability change of the order of 0.01-0.05 A(3). The results indicate that, for the case of a single-shot laser amplifier system, the beam distortion induced by this population induced change in the refractive index is comparable with the distortion arising from thermal effects.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/ol.14.001204 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Unified description of thermal and nonthermal laser-induced ultrafast structural changes in materials.
Sci Rep
December 2024
Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Strasse 40, 34132, Kassel, Germany.
The ultrafast ionic dynamics in solids induced by intense femtosecond laser excitation are controlled by two fundamentally different yet interrelated phenomena. First, the substantial generation of hot electron-hole pairs by the laser pulse modifies the interatomic bonding strength and characteristics, inducing nonthermal ionic motion. Second, incoherent electron-ion collisions facilitate thermal equilibration between electrons and ions, achieving a uniform temperature on a picosecond timescale.
View Article and Find Full Text PDFAssessment of mechanical properties and microstructure of Co-Cr dental alloys manufactured by casting, milling, and 3D printing.
J Prosthet Dent
December 2024
Associate Professor, Dental Biomaterials Research Laboratory, Department of Restorative Dentistry, Gerald Niznick College of Dentistry, University of Manitoba, Winnipeg, Manitoba, Canada. Electronic address:
Statement Of Problem: The mechanical properties and microstructure of cobalt chromium (Co-Cr) alloys should be considered when choosing the best alloy for each clinical situation. More information is needed on the digital manufacturing methods of metals in dentistry, such as computer numerical control (CNC), and direct laser metal sintering (DMLS).
Purpose: The aim of this study was to investigate the effect of the 3 different Co-Cr manufacturing processes on the mechanical properties and microstructure of Co-Cr dental alloys.
A review of chitosan role in milk bioactive-based drug delivery, smart packaging and biosensors: Recent advances and developments.
Int J Biol Macromol
December 2024
Nanotechnology Department, School of Advanced Technologies, Iran University of Science and Technology (IUST), Tehran, Iran. Electronic address:
Chitosan, a versatile biopolymer derived from chitin, is increasingly recognized in the milk industry for its multifunctional applications in drug delivery, smart packaging, and biosensor development. This review provides a comprehensive analysis of recent advances in chitosan production techniques. These include chemical, biological, and novel methods such as deep eutectic solvents (DES), microwave-assisted approaches, and laser-assisted processes.
View Article and Find Full Text PDFMesoporous polydopamine composite nanoparticles for multimodal therapy based on disrupting the redox homeostasis within tumor cells.
J Colloid Interface Sci
December 2024
Molecular Diagnostic Center, Key Laboratory of Clinical Cancer Pharmacology and Toxicology Research of Zhejiang Province, Hangzhou First People's Hospital, Hangzhou 310006, China. Electronic address:
Developing multimodal combination therapy strategies to disrupt the redox homeostasis within tumor cells is currently an important approach in cancer treatment. In this study, we designed and prepared multifunctional composite nanoparticles MPDA-PEG@MnO@2-DG (MPPMD NPs) utilizing mesoporous polydopamine nanoparticles (MPDA NPs) as carriers. These carriers were coated with polyethylene glycol (PEG), and manganese dioxide (MnO) and loaded with 2-deoxy-d-glucose (2-DG).
View Article and Find Full Text PDFMagnetic-proximity-induced anomalous hall effect at the EuO/SbTeinterface.
J Phys Condens Matter
December 2024
Department of Physics, Indian Institute of Technology Delhi, DEPRTMENT OF PHYSICS, IIT DELHI, HAUZ KHAS, New Delhi, Delhi, 110016, INDIA.
Time-reversal symmetry breaking of a topological insulator phase generates zero-field edge modes which are the hallmark of the quantum anomalous Hall effect (QAHE) and of possible value for dissipation-free switching or non-reciprocal microwave devices. But present material systems exhibiting the QAHE, such as magnetically doped bismuth telluride and twisted bilayer graphene, are intrinsically unstable, limiting their scalability. A pristine magnetic oxide at the surface of a TI would leave the TI structure intact and stabilize the TI surface, but epitaxy of an oxide on the lower-melting-point chalcogenide presents a particular challenge.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!