focal spot
High Quality Three Dimensional Computed Tomography Angiography of Abdominal Viscera with Small Focal Spot, Low Tube Voltage, and Iterative Model Reconstruction Technique
... small focal spot, low tube voltage, and iterative model reconstruction technique ...small focal spot, low tube voltage, and IMR can produce higher-quality images of abdominal vessels than ...
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Numerical simulations of the focal spot generated by a set of laser beams : LMJ⋆,⋆⋆
... The second type of calculation presents an example with a large number of monochromatic beams and very fine meshes. The data are defined on a 2048x2048 mesh, while the solution is computed on a 2048x2048 mesh. Figure 7 ...
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Bremsstrahlung emission profile from intense laser-solid interactions as a function of laser focal spot size
... The bremsstrahlung x-ray emission profile from high intensity laser-solid interactions provides valuable insight to the internal fast electron transport. Using penumbral imaging, we characterise the spatial profile of this ...
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Bremsstrahlung emission profile from intense laser-solid interactions as a function of laser focal spot size
... The bremsstrahlung x-ray emission pro fi le from high intensity laser-solid interactions provides valuable insight to the internal fast electron transport. Using penumbral imaging, we characterise the spatial pro fi le of ...
9
A Low Cost and Versatile STED Superresolution Fluorescent Microscope
... that exits the fiber end of a supercontinuum white light source or any other light sources that have a fiber con- nector output (the objective is house in a fixture with a fiber connector input adaptor). The ...
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Imaging properties of a rotation-free, arrayed-source micro-computed tomography system
... Conventional x-ray tubes use thermionic emission (TE) to generate electron beams. In thermionic emission, the cathode, usually a tungsten filament, is heated to a very high temperature, e.g. above 1000 ~ 2000°C (Sugie et ...
170
Ellipsoidal plasma mirror focusing of high power laser pulses to ultra-high intensities
... a focal spot occurs from one focal position to the other, satisfies the need to have off-axis focusing to ensure that the target is not blocking the incoming laser ...in focal spot size ...
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Escaping electrons from intense laser-solid interactions as a function of laser spot size
... The experimental campaign was conducted on the 1.05 µm PHELIX glass laser facility at GSI. The maximum laser energy post-compressor was 140 J and the pulse length measured using an auto-correlator was 700±60 fs. The ...
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SHARP FOCUS AREA OF RADIALLY-POLARIZED GAUSSIAN BEAM PROPAGATION THROUGH AN AXICON V. V. Kotlyar, A. A. Kovalev, and S. S. Stafeev
... So, here we considered the radial variant of FDTD-method, designated for solution of Maxwell equations in cylindrical coordinates for radially polarized radiation. Focusing of annular Gaussian beam with radial ...
9
3D laser nano printing on fibre paves the way for super focusing of multimode laser radiation
... Multimode high-power laser diodes suffer from inefficient beam focusing, leading to a focal spot 10–100 times greater than the diffraction limit. This inevitably restricts their wider use in ‘direct-diode’ ...
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Using mutual information to evaluate performance of medical imaging systems
... effective focal spot sizes, obtained by shifting of the step wedge 15 cm and 30 cm away from the center of the X-ray beam area toward the cathode ...effective focal spot ...effective ...
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Development of focusing plasma mirrors for ultraintense laser-driven particle and radiation sources
... The first step in the FPM design is the selection of the desired demagnification and, thus, the intensity enhancement factor. Although the smallest focal spot possible is desired, extremely small F/# optics ...
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Reflection of intense laser light from microstructured targets as a potential diagnostic of laser focus and plasma temperature
... laser focal spot size, or more correctly the ratio of the focal spot diameter to the groove separation, suggests that this approach may be used to diagnose the size of the focal ...
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Hybrid lens for Terahertz Subwavelength Focusing beyond the Diffraction Limit
... the focal spot size about 7 times smaller than that from the fibre hyperlens because our hybrid-lens can function in higher frequency region relying on the coupling of the electromagnetic modes of the ...
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Modelling the penumbra in computed tomography
... the spot, the existence of secondary X-rays generated elsewhere within the source has been noted by previous ...the focal spot using trial and error to match simulations to real data, but do not ...
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Subwavelength micropolarizer in a gold film for visible light
... The simulation results in Fig. 11 show that the focal spot size (b) coincides with the size of a low-intensity region in the center of the four-sector ring (a). A similar pattern can be seen in the ...
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Enhanced laser-energy coupling to dense plasmas driven by recirculating electron currents
... of focal spot size is signi fi cantly slower than by variation of laser pulse ...large focal spot sizes is a consequence of additional heating of the relativistic electrons which recirculate ...
9
Super-oscillatory lenses and optical metasurfaces
... In Fig. 4.11 we can see that the focal spot is surrounded by a darker region. Around this region, interference features are visible. These are quite intense and reduce the SNR, as we can see in Fig. 4.14. ...
52
Application of femtosecond laser induced nanostructures in optical memory
... The polarization-dependent self-organized nanostruc- tures are obviously aligned perpendicular to the writing laser polarization direction [Fig.10(c), (d)].Furthermore, the periodic nanostructures were also observed ...
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Evaluation of an Ultrasound Guided Focused Ultrasound CMUT Probe for Targeted Therapy Applications
... the focal spot and a parametric analy- sis providing the maximum peak-to-peak (PTP) pressure delivered by the probe under different acoustic ...the focal point was measured, showing re- sults in ...
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