A theoretical model was developed for time-resolved thermal mirror spectroscopy under top-hat cw laser excitation that induced a nanoscale surface displacement of a low absorption sample. An additional phase shift to the electrical field of a TEM(00) probe beam reflected from the surface displacement was derived, and Fresnel diffraction theory was used to calculate the propagation of the probe beam. With the theory, optical and thermal properties of three glasses were measured, and found to be consistent with literature values. With a top-hat excitation, an experimental apparatus was developed for either a single thermal mirror or a single thermal lens measurement. Furthermore, the apparatus was used for concurrent measurements of thermal mirror and thermal lens. More physical properties could be measured using the concurrent measurements.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/oe.16.012214 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
A Highly Impact-Tolerant Textile-Based Lithium-Ion Battery.
ACS Appl Mater Interfaces
January 2025
Intelligent Polymer Research Institute, Faculty of Engineering and Information Sciences, Innovation Campus, University of Wollongong, Wollongong, NSW 2500, Australia.
Textile-based lithium-ion batteries (LIBs) are in great demand to power wearable electronics. They currently face a key safety challenge, particularly concerning mechanical abuse that could trigger thermal runaway, causing harm to individuals. Here, we report on Kevlar-fabric-based LIBs that can afford high impact tolerance while offering excellent electrochemical performance comparable to metal-foil-based cells.
View Article and Find Full Text PDFCardiac performance mirrors the passive thermal tolerance range in the oyster, Ostrea edulis.
J Exp Biol
December 2024
Alfred Wegener Institute Helmholtz Center for Polar and Marine Research, Sections Integrative Ecophysiology and Deep-Sea Ecology & Technology, Am Handelshafen 12, 27515 Bremerhaven, Germany.
Increasing frequencies of heatwaves threaten marine ectotherm species but not all alike. In exposed habitats, some species rely on a higher capacity for passive tolerance at higher temperatures, thereby extending time-dependent survival limits. Here we assess how the involvement of the cardiovascular system in extended tolerance at the margins of the thermal performance curve is dependent on warming rate.
View Article and Find Full Text PDFThermal deformation compensation scheme to the sub-nanometre level of a piezoelectric offset mirror for MHz repetition rate free-electron laser.
J Synchrotron Radiat
January 2025
Dalian Coherent Light Source and State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, People's Republic of China.
Free-electron laser (FEL) facilities operating at MHz repetition rates can emit lasers with average powers reaching hundreds of watts. Partial absorption of this power induces thermal deformation of a few micrometres on the mirror surface. Such deformation degrades the characteristics of the reflected photon beam, leading to focal spot aberrations and wavefront distortions that fail to meet experimental requirements.
View Article and Find Full Text PDFThis article covers the in-vessel design of the SPARC interferometry diagnostic system, highlighting unique aspects of the systems design and port plug integration in preparation for "day-1" plasma operations as a critical diagnostic for density feedback control. An early decision for the diagnostic was to deploy two lasers in the infrared wavelength spectrum, allowing the system to have a higher optical throughput. The optimization of the in-vessel geometry for the diagnostic follows a similar approach, focusing on de-risking possible damage to the plasma facing optical components by moving them further from the plasma with an orientation that provides a greater possibility for protective features to be added.
View Article and Find Full Text PDFHigh albedo daytime radiative cooling for enhanced bifacial PV performance.
Nanophotonics
March 2024
University of Michigan, Ann Arbor, MI, USA.
We present a radiative cooling material capable of enhancing albedo while reducing ground surface temperatures beneath fielded bifacial solar panels. Electrospinning a layer of polyacrylonitrile nanofibers, or nanoPAN, onto a polymer-coated silver mirror yields a total solar reflectance of 99 %, an albedo of 0.96, and a thermal emittance of 0.
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!