Results 11 to 20 of about 239,845 (311)
Laser Beam Quality of Airy Beam in the Jet Engine Exhaust Induced Turbulence
Atmosphere, 2023 Theoretical predictions of laser beam interactions with jet-engine-exhaust-induced turbulence are of importance for optimization of various optical systems, including LIDARs and airborne laser measurement systems.
Wei Wen, Xiaoru Zhang
doaj +2 more sources
On beam quality and flatness of radiotherapy megavoltage photon beams. [PDF]
Australas Phys Eng Sci Med, 2016 Ratio of percentage depth dose (PDD) at two depths, PDD at a depth of 10 cm (PDD10), and beam flatness are monitored regularly for radiotherapy beams for quality assurance. The purpose of this study is to understand the effects of changes in one of these parameters on the other. Is it possible to monitor only the beam flatness and not PDD?
Hossain M, Rhoades J.
europepmc +4 more sources
Fabrication and Characterization of Beam Quality Phantom for External Beam Radiotherapy [PDF]
Iranian Journal of Medical Physics, 2022 Introduction: Radiation dose measurement plays a major role in Radiation Dosimetry. Effective dose delivery to the patient is ensured with the recommendation of some protocol called Quality assurance (QA). It is necessary to confirm that the beam that is
Boopathi M +5 more
doaj +2 more sources
Beam Quality Factor of Partially Coherent Airy Beam in Non-Kolmogorov Turbulence
Atmosphere, 2022 A universal formula of the beam quality factor for a partially coherent Airy (PCA) beam in non-Kolmogorov turbulence has been investigated. Results of numerical simulation display that expanding the internal scales of non-Kolmogorov turbulence is good ...
Wei Wen, Xianwu Mi, Sirui Chen
doaj +3 more sources
X-ray beam quality checks of a magnetic resonance-guided linear accelerator with its on-board megavoltage imager [PDF]
Physics and Imaging in Radiation OncologyThis study presents a method for fast and low-cost X-ray beam quality checks of magnetic resonance-guided radiotherapy (MRgRT) linacs using the on-board megavoltage imager (MVI).
Guido C. Hilgers +6 more
doaj +2 more sources
Frontiers in Physics, 2023 Deformable mirrors (DMs) are widely used in high-power laser systems to improve the output beam quality. However, under high-power laser irradiation, the heat accumulates on the DM mirror surface and results in high-power laser induced distortions (LID),
Yamin Zheng +11 more
doaj +1 more source
Frontiers in Physics, 2021 The propagation characteristics of a Hermite-Gaussian correlated Schell-model (HGCSM) beam in the turbulence of biological tissue are analyzed. The average intensity, spectral degree of coherence, and the dependence of the propagation factors on the beam
Hanghang Zhang +4 more
doaj +1 more source
Impact of the central refractive index dip of fibers on high-power applications
Frontiers in Physics, 2023 Central refractive index dip is a common phenomenon in the fibers fabricated by the modified chemical vapor deposition (MCVD) technology, which is the main fabrication technique for high-power laser fibers.
Yi An +21 more
doaj +1 more source
Photonics, 2023 The Vertical Cavity Surface-Emitting Laser (VCSEL) has led to the rapid development of advanced fields such as communication, optical sensing, smart cars, and more. The accurate testing of VCSEL beam quality is an important prerequisite for its effective
Leilei Jia, Xin Qian, Lingyu Ai
doaj +1 more source
Fabrication of a Counter-Directional Pump/Signal Combiner with Built-In Mode Field Adapter
Photonics, 2023 This article introduces a novel counter-directional pump/signal combiner with a built-in mode field adapter. This combiner offers additional functionality to address the problem of mode field mismatch between the gain fiber and delivery fiber, which ...
Jiawei Wang +6 more
doaj +1 more source