Results 31 to 40 of about 882,775 (293)
Measuring Planck beams with planets [PDF]
, 2010 Aims. Accurate measurement of the cosmic microwave background (CMB) anisotropy requires precise knowledge of the instrument beam. We explore how well the Planck beams will be determined from observations of planets, developing techniques that are also ...
Crill, B. P. +4 more
core +3 more sources
The beam quality parameter of spirally polarized beams [PDF]
Journal of Optics A: Pure and Applied Optics, 2008 Starting from the expression for the quality parameter of a superposition of two general fields, the case of beams that can be written in terms of the polarization basis introduced by Gori is investigated. Different types of this class of beam are studied and compared. In particular, spirally polarized beams are considered.
Piquero Sanz, Gemma María +1 more
openaire +2 more sources
Method for optimising the performance of PML in anchor‐loss limited model via COMSOL
IET Science, Measurement & Technology, 2022 Perfectly matched layer has been used for solving anchor‐loss limited quality factor in the Micro electromechanical systems. However, setting up a well‐behaved perfectly matched layer requires users to change the parameters of a perfectly matched layer ...
Peng Li, Jun‐Yu Ou, Jize Yan
doaj +1 more source
Stabilized high-power laser system for the gravitational wave detector advanced LIGO [PDF]
, 2012 An ultra-stable, high-power cw Nd:YAG laser system, developed for the ground-based gravitational wave detector Advanced LIGO (Laser Interferometer Gravitational-Wave Observatory), was comprehensively characterized.
Bogan, C. +12 more
core +1 more source
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 +1 more source
Generalized beam quality factor of aberrated truncated Gaussian laser beams [PDF]
Journal of the Optical Society of America A, 2011 We outline a theory for the calculation of the beam quality factor of an aberrated laser beam. We provide closed-form equations that show that the beam quality factor of an aberrated Gaussian beam depends on all primary aberrations except tilt, defocus, and x-astigmatism.
Cosmas, Mafusire, Andrew, Forbes
openaire +2 more sources
Resonant Characteristics of Rectangular Microcantilevers Vibrating Torsionally in Viscous Liquid Media [PDF]
, 2012 The resonant characteristics of rectangular microcantilevers vibrating in the torsional mode in viscous liquid media are investigated. The hydrodynamic load (torque per unit length) on the vibrating beam due to the liquid was first determined using a ...
Brand, Oliver +5 more
core +3 more sources
High Power Laser Science and EngineeringSuppressing mode degradation is the key issue for high-power laser delivery; however, diagnosing mode degradation in its entirety, ranging from the contents and origins to locations, has always been a major obstacle.
Xiao Chen +7 more
doaj +1 more source
Calibration of ionization chamber in megavoltage x-ray field of medical linear accelerator [PDF]
Nuclear Technology and Radiation ProtectionIonization chambers were calibrated regarding absorbed dose to water in MeV X-ray fields of a medical linear accelerator, with nominal maximum energies of 6 MeV and 15 MeV.
Pham Hong-Lam +13 more
doaj +1 more source
Improving elevation resolution in phased-array inspections for NDT [PDF]
, 2019 The Phased Array Ultrasonic Technique (PAUT) offers great advantages over the conventional ultrasound technique (UT), particularly because of beam focusing, beam steering and electronic scanning capabilities.
Brizuela, Jose David +4 more
core +1 more source