Phase retrieval in X-ray phase-contrast imaging suitable for
... different distances from the source [17]. (The same effect can also be achieved by using different amounts of defocus in, e.g., phase-contrast microscopy [19], or by taking images at different wavelengths.) This relates to the uniqueness of the retrieved phase. If only one image is captured, at a ce ...
... different distances from the source [17]. (The same effect can also be achieved by using different amounts of defocus in, e.g., phase-contrast microscopy [19], or by taking images at different wavelengths.) This relates to the uniqueness of the retrieved phase. If only one image is captured, at a ce ...
Tuning of resonance-spacing in a traveling-wave
... quality factor (Q) and compact resonators for different applications, such as, signal processing, sensing, and nonlinear optics has been an important and active area of research in this field [2–4]. Moreover, the possibility of low-power and low-loss tuning of resonance properties of such resonators ...
... quality factor (Q) and compact resonators for different applications, such as, signal processing, sensing, and nonlinear optics has been an important and active area of research in this field [2–4]. Moreover, the possibility of low-power and low-loss tuning of resonance properties of such resonators ...
PDF
... where is the thermoreflectance calibration coefficient, which depends on the material and illumination wavelength [15]. It is good practice to determine the value of experimentally through a calibration procedure, since changes in material composition, layer thickness, or surface roughness may chang ...
... where is the thermoreflectance calibration coefficient, which depends on the material and illumination wavelength [15]. It is good practice to determine the value of experimentally through a calibration procedure, since changes in material composition, layer thickness, or surface roughness may chang ...
Sep 25
... But: “Pure” (geometrical) optical systems would require components much larger than λ. In sub- /mm range diffraction is important, and quasi-optics handles this in a theorectical way. ...
... But: “Pure” (geometrical) optical systems would require components much larger than λ. In sub- /mm range diffraction is important, and quasi-optics handles this in a theorectical way. ...
Mirror contamination in space I: mirror modelling
... 1999). The change to the model, as presented in Sect. 2.2, is only in the equations for the reflection coefficients rs and rp , combined here as an implied s- and p-specific reflection coefficient Rt . We employ a capital R for combined multilayer intensity reflections at a certain interface, which ...
... 1999). The change to the model, as presented in Sect. 2.2, is only in the equations for the reflection coefficients rs and rp , combined here as an implied s- and p-specific reflection coefficient Rt . We employ a capital R for combined multilayer intensity reflections at a certain interface, which ...
PowerPoint Presentation - Tip-tilt mirror and sensor configuration
... diffracted field U2 can be computed from the incident field U1 by a phase factor times the Fourier transform of U1 • “Image plane is Fourier transform of pupil ...
... diffracted field U2 can be computed from the incident field U1 by a phase factor times the Fourier transform of U1 • “Image plane is Fourier transform of pupil ...
Continuous wave Nd:YAG channel waveguide laser produced by
... modifications can be achieved in a precise manner at both micro- and submicron scales [8]. Because of the energy and momentum mismatch between protons and electrons in the target material, the protons will maintain a straight pathway and cause little proximity effect as energy obtained by secondary ...
... modifications can be achieved in a precise manner at both micro- and submicron scales [8]. Because of the energy and momentum mismatch between protons and electrons in the target material, the protons will maintain a straight pathway and cause little proximity effect as energy obtained by secondary ...
FOC-Measurements
... However, in a WDM system, the precise measurement of the laser wavelength is necessary. In principle, the wavelength and the spectral width can be measured by passing the light through a tunable filter and measuring the output light intensity as function of wavelength. This not very easy. Generally, ...
... However, in a WDM system, the precise measurement of the laser wavelength is necessary. In principle, the wavelength and the spectral width can be measured by passing the light through a tunable filter and measuring the output light intensity as function of wavelength. This not very easy. Generally, ...
Unit 1.7 Optical networking and processing
... OFG selects which, if any, of the add wavelengths are reflected forward to port 1 of the OC along with the pass-through wavelengths. At port 1 of the OC the selected add wavelengths and pass-through wavelengths are passed to the output at port 2. ...
... OFG selects which, if any, of the add wavelengths are reflected forward to port 1 of the OC along with the pass-through wavelengths. At port 1 of the OC the selected add wavelengths and pass-through wavelengths are passed to the output at port 2. ...
Multichip module with planar-integrated free-space
... Second, VM-type architectures involve point-tomultipoint 共fan-out兲 and multipoint-to-point 共fan-in兲 operations that cannot so easily be achieved with electronic or guided-wave optical hardware if the splitting or combining ratio is high.1 By contrast, elegant and comparatively simple implementations ...
... Second, VM-type architectures involve point-tomultipoint 共fan-out兲 and multipoint-to-point 共fan-in兲 operations that cannot so easily be achieved with electronic or guided-wave optical hardware if the splitting or combining ratio is high.1 By contrast, elegant and comparatively simple implementations ...
Interferometry
Interferometry is a family of techniques in which waves, usually electromagnetic, are superimposed in order to extract information about the waves. Interferometry is an important investigative technique in the fields of astronomy, fiber optics, engineering metrology, optical metrology, oceanography, seismology, spectroscopy (and its applications to chemistry), quantum mechanics, nuclear and particle physics, plasma physics, remote sensing, biomolecular interactions, surface profiling, microfluidics, mechanical stress/strain measurement, and velocimetry.Interferometers are widely used in science and industry for the measurement of small displacements, refractive index changes and surface irregularities. In analytical science, interferometers are used in continuous wave Fourier transform spectroscopy to analyze light containing features of absorption or emission associated with a substance or mixture. An astronomical interferometer consists of two or more separate telescopes that combine their signals, offering a resolution equivalent to that of a telescope of diameter equal to the largest separation between its individual elements.