نتایج جستجو برای: laser diffraction technique
تعداد نتایج: 833503 فیلتر نتایج به سال:
In order to probe cell biology at the molecular level and correlate single molecule activity with macroscopic cellular behavior in real-time, biologists need farfield microscopy techniques with the highest possible spatial as well as temporal resolution. Driven by this need, the use of lasers in confocal microscopy has taken fluorescence microscopy to the diffraction limit, which was long consi...
In this study, we report formation of weblike fibrous nanostructure and nanoparticles of magnetic neodymium-iron-boron (NdFeB) via femtosecond laser radiation at MHz pulse repetition frequency in air at atmospheric pressure. Scanning electron microscopy (SEM) analysis revealed that the nanostructure is formed due to aggregation of polycrystalline nanoparticles of the respective constituent mate...
We demonstrate the use of an X-ray free electron laser synchronized with an optical pump laser to obtain X-ray diffraction snapshots from the photoactivated states of large membrane protein complexes in the form of nanocrystals flowing in a liquid jet. Light-induced changes of Photosystem I-Ferredoxin co-crystals were observed at time delays of 5 to 10 µs after excitation. The result correlates...
We have demonstrated a compact, optical-fiber-fed, optical displacement sensor utilizing a Littrow-mounted diffraction grating to form a low-finesse Fabry-Perot cavity. Length changes of the cavity are read out via the Pound-Drever-Hall rf modulation technique at 925 MHz. The sensor has a nominal working distance of 2 cm and a total dynamic range of 160 nm. The displacement noise floor was less...
Phase retrieval refers to recovering a signal from its Fourier magnitude. This problem arises naturally in many scientific applications, such as ultra-short laser pulse characterization and diffraction imaging. Unfortunately, phase retrieval is ill-posed for almost all one-dimensional signals. In order to characterize a laser pulse and overcome the illposedness, it is common to use a technique ...
Simultaneous transcranial imaging of two functional parameters, the total concentration of hemoglobin and the hemoglobin oxygen saturation, in the rat brain in vivo is realized noninvasively using laser-based photoacoustic tomography (PAT). As in optical diffusion spectroscopy, PAT can assess the optical absorption of endogenous chromophores, e.g., oxygenated and deoxygenated hemoglobins, at mu...
Abstract Nb 2 O 5 nanostructures were successfully deposited by a Pulsed Laser Deposition technique (PLD) onto quartz substrates. The effects of annealing temperature on the optical morphological and structural properties nano-thin films investigated. X-ray diffraction (XRD) results indicated formation monoclinic crystalline structure, with preferential orientation at (301) direction. energy ba...
One of the challenges regarding application laser polishing in injection mold manufacturing is to eliminate tensile residual stress on a polished cavity surface without extra expenses an annealing vacuum furnace. This study aims develop fast method using dual-beam system by which can be laser-polished and then laser-annealed. Fourteen steel specimens were laser, resulting roughness reduction fr...
Laser-induced electron diffraction is an evolving tabletop method that aims to image ultrafast structural changes in gas-phase polyatomic molecules with sub-Ångström spatial and femtosecond temporal resolutions. Here we demonstrate the retrieval of multiple bond lengths from a polyatomic molecule by simultaneously measuring the C-C and C-H bond lengths in aligned acetylene. Our approach takes t...
In this paper, we explore theoretically and experimentally the laser beam shaping ability resulting from the coaxial superposition of two coherent Gaussian beams (GBs). This technique is classified under interferometric laser beam shaping techniques contrasting with the usual ones based on diffraction. The experimental setup does not involve the use of some two-wave interferometer but uses a sp...
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