Experimental observation of speckle instability in Kerr random
... from noise, energy from the pump at fp will be preferentially transferred into photons at fm = fp − 1/τN L resulting in the beating of the two beams. In the same way, the spontaneous speckle oscillations observed in our experiment result from the beating between the incident HeNe beam and the nonlin ...
... from noise, energy from the pump at fp will be preferentially transferred into photons at fm = fp − 1/τN L resulting in the beating of the two beams. In the same way, the spontaneous speckle oscillations observed in our experiment result from the beating between the incident HeNe beam and the nonlin ...
Precision Electron Diffraction Structure Analysis and Its Use in
... excitation and the interband transitions [15, 25]. For rather thick crystals, e.g., in convergent-beam electron diffraction [16], one should also take into account absorption. This is done by the introduction of the complex potential. The major contribution to the imaginary part of the structure fac ...
... excitation and the interband transitions [15, 25]. For rather thick crystals, e.g., in convergent-beam electron diffraction [16], one should also take into account absorption. This is done by the introduction of the complex potential. The major contribution to the imaginary part of the structure fac ...
Nonlinear Raman-Nath second harmonic generation with structured
... two adjacent opposite domains, which is caused by the sharp χ (2) modulation from + 1 to −1. And it only relates to once Fourier transform of the structure of the crystal. While, in our case, the nonlinear polarization wave involves the product of two Fourier expansion series of the FW [see Eq. (1)] ...
... two adjacent opposite domains, which is caused by the sharp χ (2) modulation from + 1 to −1. And it only relates to once Fourier transform of the structure of the crystal. While, in our case, the nonlinear polarization wave involves the product of two Fourier expansion series of the FW [see Eq. (1)] ...
Introduction to super-resolution microscopy
... sample to measure the fluorescence intensity at each position in the sample. A fluorescence image is then constructed as a spatial distribution of fluorescence signals detected at each point in the scan. The spatial resolution is restricted by the size of the excitation focus, and due to the wave natur ...
... sample to measure the fluorescence intensity at each position in the sample. A fluorescence image is then constructed as a spatial distribution of fluorescence signals detected at each point in the scan. The spatial resolution is restricted by the size of the excitation focus, and due to the wave natur ...
Negative refraction without negative index in metallic photonic crystals
... lowered in a metallic photonic crystal, making negative refraction and subwavelength imaging possible using a broader range of materials. The presence of metals in a photonic crystal may also increase polarization dependence and improve focusing ability, as will be discussed later. For the sake of t ...
... lowered in a metallic photonic crystal, making negative refraction and subwavelength imaging possible using a broader range of materials. The presence of metals in a photonic crystal may also increase polarization dependence and improve focusing ability, as will be discussed later. For the sake of t ...
Review on X-ray Detectors Based on Scintillators and CMOS
... indication that interactions between photons and isolated atomic electrons do not occur. Actually, the dependence between the cross-section and the atomic number shows that photo is a more complex function of Z. In the energy range between 100 keV and 5 MeV, the exponent of Z ranges between 4 and 5 ...
... indication that interactions between photons and isolated atomic electrons do not occur. Actually, the dependence between the cross-section and the atomic number shows that photo is a more complex function of Z. In the energy range between 100 keV and 5 MeV, the exponent of Z ranges between 4 and 5 ...
PreDesigner Manual
... values, and will need to find out the others, so we can understand in broad brush terms - how the required system will behave, its field of view, magnification etc. The paraxial mode is the simplest, lowest possible level of dealing with lenses. Diffraction and aberrations are completely ignored. At ...
... values, and will need to find out the others, so we can understand in broad brush terms - how the required system will behave, its field of view, magnification etc. The paraxial mode is the simplest, lowest possible level of dealing with lenses. Diffraction and aberrations are completely ignored. At ...
Parallelized STED fluorescence nanoscopy
... electron and scanning probe microscopy have provided much finer details since then, they lack the possibility of non-invasively imaging (living) cells and tissue as well as other transparent materials in three dimensions (3D). In the 1990s it was discovered that the diffraction resolution barrier in ...
... electron and scanning probe microscopy have provided much finer details since then, they lack the possibility of non-invasively imaging (living) cells and tissue as well as other transparent materials in three dimensions (3D). In the 1990s it was discovered that the diffraction resolution barrier in ...
Extending the Effective Ranging Depth of Spectral Domain Optical
... depth is defined as the imaging depth at which the sensitivity has decayed −6 dB from the peak value [2]. For FDOCT, the complex conjugate ambiguity further limits the imaging depth to one half of the full-range imaging space. Another limitation on the imaging depth of the FDOCT is posed by the fini ...
... depth is defined as the imaging depth at which the sensitivity has decayed −6 dB from the peak value [2]. For FDOCT, the complex conjugate ambiguity further limits the imaging depth to one half of the full-range imaging space. Another limitation on the imaging depth of the FDOCT is posed by the fini ...
Diffraction - ICT for IST
... Diffraction of a circular wave on an obstacle The table cells contain the names of files, available on your CD, which illustrate the diffraction of a circular wave on an obstacle of different width. E.g. “soundwaterlight- en.jar” or “diffraction_Fresnel_obstacle_slit.zip” are simulation files, avail ...
... Diffraction of a circular wave on an obstacle The table cells contain the names of files, available on your CD, which illustrate the diffraction of a circular wave on an obstacle of different width. E.g. “soundwaterlight- en.jar” or “diffraction_Fresnel_obstacle_slit.zip” are simulation files, avail ...
Observation of Localized States in Lieb Photonic
... reflected on a beam splitter (BS). We obtain the output profile by using a 10× MO and a CCD camera. To study the phase structure of different profiles, we interfere the input and the output patterns with a wide-tilted plane wave. We start studying the bulk diffraction by using a B-site excitation, w ...
... reflected on a beam splitter (BS). We obtain the output profile by using a 10× MO and a CCD camera. To study the phase structure of different profiles, we interfere the input and the output patterns with a wide-tilted plane wave. We start studying the bulk diffraction by using a B-site excitation, w ...
The Effect of Temperature and Solution pH on the Nucleation of
... magnification was used, focusing on only a small portion of the well at a time, so that individual crystals could be more easily viewed and measured. Five crystals per well were randomly selected, and the distance between parallel {110} faces and the distance between the apexes of the {101} faces we ...
... magnification was used, focusing on only a small portion of the well at a time, so that individual crystals could be more easily viewed and measured. Five crystals per well were randomly selected, and the distance between parallel {110} faces and the distance between the apexes of the {101} faces we ...
Variable xy-UV beam expander for high-power laser
... In Table 5b we see the variable x-beam expander needs to cover the magnification range magxBE from 3.476 to 14.865, which is wider than the y-beam expander needs to cover (a ~4.3x optical zoom). We also see that, as with the y-beam expander, the largest w0R in combined with the furthest out z0 yield ...
... In Table 5b we see the variable x-beam expander needs to cover the magnification range magxBE from 3.476 to 14.865, which is wider than the y-beam expander needs to cover (a ~4.3x optical zoom). We also see that, as with the y-beam expander, the largest w0R in combined with the furthest out z0 yield ...
Holographic Fabrication of Designed Functional Defect Lines in
... spatially varying pixel-by-pixel phase engineering of phase patterns [34], or through production of hexagonal lattice wave fields with a gradient basis [35]. Spatially variant photonic crystal lattices have been fabricated with the SLM using an innovative synthesis approach that calculates the struc ...
... spatially varying pixel-by-pixel phase engineering of phase patterns [34], or through production of hexagonal lattice wave fields with a gradient basis [35]. Spatially variant photonic crystal lattices have been fabricated with the SLM using an innovative synthesis approach that calculates the struc ...
High spatial resolution performance of a triple Fabry–Pérot filtergraph
... within the channeled spectrum. Several filtergraphs using FPIs have been recently constructed for solar observations (Bonaccini et al. 1989; Bendlin et al. 1992; Cavallini 1998; Kentischer et al. 1998). The spectral passband of an FPI varies with the angle of incidence of a plane wave which transver ...
... within the channeled spectrum. Several filtergraphs using FPIs have been recently constructed for solar observations (Bonaccini et al. 1989; Bendlin et al. 1992; Cavallini 1998; Kentischer et al. 1998). The spectral passband of an FPI varies with the angle of incidence of a plane wave which transver ...
Selective plane illumination microscopy techniques in
... in Box 1) to illuminate the specimen from the side. Techniques like SPIM, generally called light-sheet microscopy methods, are becoming increasingly popular because they achieve excellent resolution at high penetration depths (see Glossary in Box 1) while being minimally invasive at the same time (e ...
... in Box 1) to illuminate the specimen from the side. Techniques like SPIM, generally called light-sheet microscopy methods, are becoming increasingly popular because they achieve excellent resolution at high penetration depths (see Glossary in Box 1) while being minimally invasive at the same time (e ...
A finite element beam propagation method for simulation of liquid
... Pieter J. M. Vanbrabant1 , Jeroen Beeckman1 , Kristiaan Neyts1 , Richard James2 and F. Anibal Fernandez2 ...
... Pieter J. M. Vanbrabant1 , Jeroen Beeckman1 , Kristiaan Neyts1 , Richard James2 and F. Anibal Fernandez2 ...
Self-Accelerating Self-Trapped Optical Beams
... Optical spatial solitons have been studied for decades [6]. However, in almost all cases self-trapped beams propagate without bending their trajectories [7]. The core reason is the conservation of momentum. Exceptions occur when the nonlinearities are asymmetric—acting as an external force; hence, m ...
... Optical spatial solitons have been studied for decades [6]. However, in almost all cases self-trapped beams propagate without bending their trajectories [7]. The core reason is the conservation of momentum. Exceptions occur when the nonlinearities are asymmetric—acting as an external force; hence, m ...
375_Lo.pdf
... noted that due to the center wavelength of the thermal light source is around 590 nm, the refractive index which is the function of wavelength could not be the same as specification: 1.5116 (at 1550 nm wavelength). Therefore, the theoretical refractive index value at 590 nm is calculated by Sellmei ...
... noted that due to the center wavelength of the thermal light source is around 590 nm, the refractive index which is the function of wavelength could not be the same as specification: 1.5116 (at 1550 nm wavelength). Therefore, the theoretical refractive index value at 590 nm is calculated by Sellmei ...
Anisotropic Weak Localization of Light
... was contained in a cylindrical cell of 8 cm diameter and 4 cm thickness which satisfied the requirement of having an optically thick sample. A monodomain nematic phase was obtained by heating the system well above the nematic-isotropic phase transition at 309 K and then cooling slowly overnight to 3 ...
... was contained in a cylindrical cell of 8 cm diameter and 4 cm thickness which satisfied the requirement of having an optically thick sample. A monodomain nematic phase was obtained by heating the system well above the nematic-isotropic phase transition at 309 K and then cooling slowly overnight to 3 ...
Variational Phase Imaging Using the Transport-of
... do introduce phase shifts due to variations in the optical path length in the sample. The information about the distribution of the refractive index (hence, about the morphology of the cell) is encoded in the phase. Two conventional imaging modalities that translate the phase shifts into detectable ...
... do introduce phase shifts due to variations in the optical path length in the sample. The information about the distribution of the refractive index (hence, about the morphology of the cell) is encoded in the phase. Two conventional imaging modalities that translate the phase shifts into detectable ...
Understanding Laser Beam Parameters Leads to Better System
... a user how the power is distributed across the beam area. For example, in a material processing situation, it is easily understandable why two beams of identical power and diameter (or contour) leave different burn marks on a substrate if one beam features a Gaussian profile (maximum intensity in th ...
... a user how the power is distributed across the beam area. For example, in a material processing situation, it is easily understandable why two beams of identical power and diameter (or contour) leave different burn marks on a substrate if one beam features a Gaussian profile (maximum intensity in th ...
Fourier domain optical coherence tomography with an
... compared with the conventional lens which can image only short depth ranges with high lateral resolution. We showed in the paper the superior ability of the system with an axicon to resolve a 15µm slit across a 4mm DOF compared to a spherical lens. However higher signal to noise ratio images can be ...
... compared with the conventional lens which can image only short depth ranges with high lateral resolution. We showed in the paper the superior ability of the system with an axicon to resolve a 15µm slit across a 4mm DOF compared to a spherical lens. However higher signal to noise ratio images can be ...
1 Introduction - Stony Brook Laser Teaching Center
... the Poynting vector in the xy-plane, in general, is zero. However, this new azimuthal component ~ ×~r [11]. remains and in turn creates a net angular momentum J~ in the beam, proportional to S The azimuthal component is termed orbital angular momentum (OAM) and it is an intrinsic property of optical ...
... the Poynting vector in the xy-plane, in general, is zero. However, this new azimuthal component ~ ×~r [11]. remains and in turn creates a net angular momentum J~ in the beam, proportional to S The azimuthal component is termed orbital angular momentum (OAM) and it is an intrinsic property of optical ...
Sub-THz Electron Spin Resonance spectroscopy based on a Martin
... chemical compound DPPH is a dark-blue stable freeradical, which provides one unpaired electron in the central nitrogen ion of every molecule, and is established to benchmark the position and intensity of ESR setups.[59] Recent studies tested this radical also as a polarizing agent for DNP-NMR,[60] a ...
... chemical compound DPPH is a dark-blue stable freeradical, which provides one unpaired electron in the central nitrogen ion of every molecule, and is established to benchmark the position and intensity of ESR setups.[59] Recent studies tested this radical also as a polarizing agent for DNP-NMR,[60] a ...