The spatial shape of entangled photon states generated in
... matching is the direction p y = 0, as it is shown in figure 2(d). This is the case when the direction of propagation of the pump beam (z) forms an angle ν0 = 90◦ with the optic axis of the crystal. It is also the case for most QPM configurations used for SPDC [19, 20]. In figure 3(a) we plot a case ...
... matching is the direction p y = 0, as it is shown in figure 2(d). This is the case when the direction of propagation of the pump beam (z) forms an angle ν0 = 90◦ with the optic axis of the crystal. It is also the case for most QPM configurations used for SPDC [19, 20]. In figure 3(a) we plot a case ...
Suppression of stimulated Brillouin scattering in
... pump pulse needs to be transmitted. Numerical simulations for a 1-m-long fiber show that 15ns pulses with peak powers ~10 kW can be transmitted as long as the coupling coefficient of the FBG exceeds a certain minimum value. The same conclusion should hold for other pulse widths and fiber lengths. Th ...
... pump pulse needs to be transmitted. Numerical simulations for a 1-m-long fiber show that 15ns pulses with peak powers ~10 kW can be transmitted as long as the coupling coefficient of the FBG exceeds a certain minimum value. The same conclusion should hold for other pulse widths and fiber lengths. Th ...
microscopy and staining
... principle that cells differ in refractive index (a factor by which light is slowed as it passes through a material) from their surroundings. Light passing through a cell thus differs in phase from light passing through its surroundings. This subtle difference is amplified by a device in the objectiv ...
... principle that cells differ in refractive index (a factor by which light is slowed as it passes through a material) from their surroundings. Light passing through a cell thus differs in phase from light passing through its surroundings. This subtle difference is amplified by a device in the objectiv ...
Diffraction is…
... Huygens’ principle every point on a wavefront may be regarded as a secondary source of wavelets curved wavefront: ...
... Huygens’ principle every point on a wavefront may be regarded as a secondary source of wavelets curved wavefront: ...
- ePrints Soton
... of a grating bar, ns is refractive index thickness of the substrate, F is the fill factor, and is the angle of incident beam. Typically, grating bars are produced from a relatively high refractive index material on a silica substrate, and are surrounded by air. Subwavelength gratings have dimensio ...
... of a grating bar, ns is refractive index thickness of the substrate, F is the fill factor, and is the angle of incident beam. Typically, grating bars are produced from a relatively high refractive index material on a silica substrate, and are surrounded by air. Subwavelength gratings have dimensio ...
Optical Processing for Pattern Properties
... FIG.3. TWOsamples of regular A and irregular B distribution of straight lines with corresponding spectra C and D.In E and F are shown the corresponding angular intensity distributions. The curves G and N shows the effect of decreasing the length of the vertical lines to half their original value G ...
... FIG.3. TWOsamples of regular A and irregular B distribution of straight lines with corresponding spectra C and D.In E and F are shown the corresponding angular intensity distributions. The curves G and N shows the effect of decreasing the length of the vertical lines to half their original value G ...
Optimization of Bragg Grating in Optical Fiber Using - lea
... function fitness performance. However, as the fitness function is based on a well defined model of the literature, so that is very difficult to improve it. The fitness function compares the target and calculated curves of reflectivity and dispersion, which are sampling along the frequency. Thus, the ...
... function fitness performance. However, as the fitness function is based on a well defined model of the literature, so that is very difficult to improve it. The fitness function compares the target and calculated curves of reflectivity and dispersion, which are sampling along the frequency. Thus, the ...
Circular Dichroism
... Although it might look like that, the dispersion curve is not the first derivative of the absorption curve. Even far away from the absorption maximum there is always still a wave-length dependent refractive index (see a quartz prism) even in the completely transparent region. In optically anisotrop ...
... Although it might look like that, the dispersion curve is not the first derivative of the absorption curve. Even far away from the absorption maximum there is always still a wave-length dependent refractive index (see a quartz prism) even in the completely transparent region. In optically anisotrop ...
Atmospheric Turbulence and its Influence on Adaptive Optics
... Adaptive Optics (AO) is still a relatively young branch of astronomical instrumentation. Different technologies are developing all the time and it can be difficult keeping up with all the different acronyms (e.g. GLAO, MOAO, MCAO, SLGS, RLGS, etc..) never mind the technologies themselves. It is easy ...
... Adaptive Optics (AO) is still a relatively young branch of astronomical instrumentation. Different technologies are developing all the time and it can be difficult keeping up with all the different acronyms (e.g. GLAO, MOAO, MCAO, SLGS, RLGS, etc..) never mind the technologies themselves. It is easy ...
ABCD law for Gaussian laser beams
... A Gaussian beam is characterized by its Rayleigh range z0 = kw02 /2. From this, the beam waist radius w0 may be extracted if the wavelength is known. Suppose that a Gaussian beam encounters an optical system at position z, referenced to the position of the beams waist as shown in Fig. 1. The beam ex ...
... A Gaussian beam is characterized by its Rayleigh range z0 = kw02 /2. From this, the beam waist radius w0 may be extracted if the wavelength is known. Suppose that a Gaussian beam encounters an optical system at position z, referenced to the position of the beams waist as shown in Fig. 1. The beam ex ...
Basic Interferometry and Optical Testing Two
... dark fringes result (destructive interference). For a plane wave, the “grating” lines are really planes perpendicular to the plane of the figure and the dark and bright fringes are also planes perpendicular to the plane of the figure. If the plane waves are traveling to the right, these fringes woul ...
... dark fringes result (destructive interference). For a plane wave, the “grating” lines are really planes perpendicular to the plane of the figure and the dark and bright fringes are also planes perpendicular to the plane of the figure. If the plane waves are traveling to the right, these fringes woul ...
What is a surface plasmon?
... in order to compute numerically the location of poles and zeros in the complex plane Example: M.C. Hutley and D. Maystre, 1976: Sinusoidal gold grating with a period d=555.5 nm, Illuminated with p polarized light of wavelength 647 nm. For small incidences, the only non-evanescent order is the zeroth ...
... in order to compute numerically the location of poles and zeros in the complex plane Example: M.C. Hutley and D. Maystre, 1976: Sinusoidal gold grating with a period d=555.5 nm, Illuminated with p polarized light of wavelength 647 nm. For small incidences, the only non-evanescent order is the zeroth ...
The Four-Quadrant Phase-Mask Coronagraph. I. Principle
... the interferometric coronagraph imagined by Bracewell (1978), where the light from several distant telescopes is combined with a n phase shift applied on half of the beams. Here, we are concerned only with single-aperture telescopes, the angular resolution of which is suited for the detection of out ...
... the interferometric coronagraph imagined by Bracewell (1978), where the light from several distant telescopes is combined with a n phase shift applied on half of the beams. Here, we are concerned only with single-aperture telescopes, the angular resolution of which is suited for the detection of out ...
waveplates - CVI Laser Optics
... 37λ/ 4 waveplate at 500 nm with m = 18. Multiple-order waveplates are inexpensive, high-damage-threshold retarders. Further analysis shows that this same 0.5 mm plate is a 19λ/2 half waveplate at 488.2 nm and a 10λ full-wave waveplate at 466.5 nm. The transmission of this plate between parallel pola ...
... 37λ/ 4 waveplate at 500 nm with m = 18. Multiple-order waveplates are inexpensive, high-damage-threshold retarders. Further analysis shows that this same 0.5 mm plate is a 19λ/2 half waveplate at 488.2 nm and a 10λ full-wave waveplate at 466.5 nm. The transmission of this plate between parallel pola ...
UNIVERSITAT POLITÈCNICA DE CATALUNYA
... fifth depend upon the ratios between the linear phase constants at the fundamental frequency for the ordinary and extraordinary waves and between the fundamental ordinary wave and the second harmonic extraordinary wave respectively, i.e. r-¿ = —ki/kz, ra = —ki/ks and are subject to the material and ...
... fifth depend upon the ratios between the linear phase constants at the fundamental frequency for the ordinary and extraordinary waves and between the fundamental ordinary wave and the second harmonic extraordinary wave respectively, i.e. r-¿ = —ki/kz, ra = —ki/ks and are subject to the material and ...
Slide 1
... For -1 order (“-” means diffract to the left side), L2-L1 = -psin = -psin=-l, so sin=l/p. Here p is the period of the grating, assume refractive index n=1. However, if the contribution from each slit is zero (wsin=nl, n=1, 2…), then the diffracted light will be dark at that angle, even though ...
... For -1 order (“-” means diffract to the left side), L2-L1 = -psin = -psin=-l, so sin=l/p. Here p is the period of the grating, assume refractive index n=1. However, if the contribution from each slit is zero (wsin=nl, n=1, 2…), then the diffracted light will be dark at that angle, even though ...
Confocal Live Cell Microscopy
... Optical Slice Thickness: The thickness of the area from which light is collected to form a confocal image. This is controlled by the size of the pinhole. Live Cell Imaging: Most of the time, samples for fluorescence microscopy are fixed and permeabilized to preserve cell structure and allow fluoroph ...
... Optical Slice Thickness: The thickness of the area from which light is collected to form a confocal image. This is controlled by the size of the pinhole. Live Cell Imaging: Most of the time, samples for fluorescence microscopy are fixed and permeabilized to preserve cell structure and allow fluoroph ...
РЕФЕРАТ
... COHERENT SPECTRUM ANALYZER WITH MATRIX DETECTOR Object of study is the process of converting the light field in the coherent optical spectrum analyzers by performing spatial Fourier transform of the test signal. The subject of the study is the generalized characteristics of the coherent spectrum ana ...
... COHERENT SPECTRUM ANALYZER WITH MATRIX DETECTOR Object of study is the process of converting the light field in the coherent optical spectrum analyzers by performing spatial Fourier transform of the test signal. The subject of the study is the generalized characteristics of the coherent spectrum ana ...
Quantum Imaging using Non-linear Optics 1 Introduction and Motivation December 15, 2011
... scattered; they therefore cannot be used to form a coherent image suitable for holographic reconstruction. The implementation of quantum holography makes use of entangled-photon beams generated. As shown in Fig. 1, one beam from the source S enters the chamber opening and is scattered from the objec ...
... scattered; they therefore cannot be used to form a coherent image suitable for holographic reconstruction. The implementation of quantum holography makes use of entangled-photon beams generated. As shown in Fig. 1, one beam from the source S enters the chamber opening and is scattered from the objec ...
Construction and Validation of a White Light Interferometer
... Even though the conventional interferometers are extensively used they are built for ruggedness and have many features and different techniques of measurement integrated which are not effectively used by all. Moreover they have features for automated adjustment which can be done manually to some ext ...
... Even though the conventional interferometers are extensively used they are built for ruggedness and have many features and different techniques of measurement integrated which are not effectively used by all. Moreover they have features for automated adjustment which can be done manually to some ext ...
A study of reflection and transmission of
... to compare the equations in my program to those in the article. In his article, Yang describes the E-ray’s transmitted field, reflected field, and incident field. From these the TE(denoted ⊥) and TM-mode (denoted k) amplitude reflection coefficients (Re⊥ and Rek , respectively) and amplitude transmi ...
... to compare the equations in my program to those in the article. In his article, Yang describes the E-ray’s transmitted field, reflected field, and incident field. From these the TE(denoted ⊥) and TM-mode (denoted k) amplitude reflection coefficients (Re⊥ and Rek , respectively) and amplitude transmi ...
Optimizing MRI Protocols Overview Image Contrast
... images: • Increase with TE - limiting the utility of GRE T2*-weighted images in many cases. • Are worst for tissue/air interfaces, but noticeable at tissue/bone interfaces. • Are usually a detriment, but are useful in some ...
... images: • Increase with TE - limiting the utility of GRE T2*-weighted images in many cases. • Are worst for tissue/air interfaces, but noticeable at tissue/bone interfaces. • Are usually a detriment, but are useful in some ...
Phase-contrast X-ray imaging
Phase-contrast X-ray imaging (PCI) or phase-sensitive X-ray imaging is a general term for different technical methods that use information concerning changes in the phase of an X-ray beam that passes through an object in order to create its images. Standard X-ray imaging techniques like radiography or computed tomography (CT) rely on a decrease of the X-ray beam's intensity (attenuation) when traversing the sample, which can be measured directly with the assistance of an X-ray detector. In PCI however, the beam's phase shift caused by the sample is not measured directly, but is transformed into variations in intensity, which then can be recorded by the detector.In addition to producing projection images, PCI, like conventional transmission, can be combined with tomographic techniques to obtain the 3D distribution of the real part of the refractive index of the sample. When applied to samples that consist of atoms with low atomic number Z, PCI is more sensitive to density variations in the sample than conventional transmission-based X-ray imaging. This leads to images with improved soft tissue contrast.In the last several years, a variety of phase-contrast X-ray imaging techniques have been developed, all of which are based on the observation of interference patterns between diffracted and undiffracted waves. The most common techniques are crystal interferometry, propagation-based imaging, analyzer-based imaging, edge-illumination and grating-based imaging (see below).