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Space-Time-Wavelength Mapping Based
... Optical tweezers use forces arising from intensity gradients in a strongly focused beam of light to trap and move micro- and nano-scale objects [1]. We recently proposed a new optical tweezing approach that utilizes space-timewavelength mapping (STWM) to enable electronic control of optical force fi ...
... Optical tweezers use forces arising from intensity gradients in a strongly focused beam of light to trap and move micro- and nano-scale objects [1]. We recently proposed a new optical tweezing approach that utilizes space-timewavelength mapping (STWM) to enable electronic control of optical force fi ...
Sun et al., Nature 493, 195 (2013).
... extends the functionalities of phased arrays beyond conventional beam focusing and steering, opening up possibilities for large-scale deployment in applications such as communication, laser detection and ranging, three-dimensional holography and biomedical sciences, to name just a few. An NPA, resem ...
... extends the functionalities of phased arrays beyond conventional beam focusing and steering, opening up possibilities for large-scale deployment in applications such as communication, laser detection and ranging, three-dimensional holography and biomedical sciences, to name just a few. An NPA, resem ...
Modeling, Simulation and Application of the Probe Beam Deflection
... refractive index profile along its beam path. • The probe beam deflection technique offers various advantages when compared to transducers, these include: Wave front directionality measurement, passive sensing, and low implementation cost. ...
... refractive index profile along its beam path. • The probe beam deflection technique offers various advantages when compared to transducers, these include: Wave front directionality measurement, passive sensing, and low implementation cost. ...
PDF
... of Lg 苷 Lu 兾2. The two surface gratings are shifted by Lu 兾2 with respect to each other and separated by a distance of ⬃d along the Z axis. The resulting diffraction pattern is a superposition of diffraction effects caused by the three stacked gratings and can be described with Eqs. (1) and (2). The ...
... of Lg 苷 Lu 兾2. The two surface gratings are shifted by Lu 兾2 with respect to each other and separated by a distance of ⬃d along the Z axis. The resulting diffraction pattern is a superposition of diffraction effects caused by the three stacked gratings and can be described with Eqs. (1) and (2). The ...
Path-reversed substrate-guided- wave optical interconnects for
... Figure 1~c! shows a phase-matching diagram for the recording and the reconstruction wave vectors in the holographic medium for the 11-order Bragg diffraction.30,32 The recording wave vector kc ~ukcu 5 2pn9y lc! is phase matched with grating vector K ~uKu 5 2pyL!, as are the reconstruction wave vecto ...
... Figure 1~c! shows a phase-matching diagram for the recording and the reconstruction wave vectors in the holographic medium for the 11-order Bragg diffraction.30,32 The recording wave vector kc ~ukcu 5 2pn9y lc! is phase matched with grating vector K ~uKu 5 2pyL!, as are the reconstruction wave vecto ...
SiDIMEX2017
... The technique of imaging of fast processes at high intensity synchrotron radiation (SR) beam is developed in the Budker Institute of Nuclear Physics since the beginning of 2000s. The DIMEX (Detector for Imaging of Explosions) based on gas ionization chamber is working at the channel 0 at the VEPP-3 ...
... The technique of imaging of fast processes at high intensity synchrotron radiation (SR) beam is developed in the Budker Institute of Nuclear Physics since the beginning of 2000s. The DIMEX (Detector for Imaging of Explosions) based on gas ionization chamber is working at the channel 0 at the VEPP-3 ...
Wavefront retrieval of amplified femtosecond
... directions for which both indices (ordinary and extraordinary) are identical for the fundamental and the SH beam. In this process, the efficient conversion is very sensitive to the propagation direction of the fundamental beam. This angular dependence will be the basis to retrieve the wavefront of a ...
... directions for which both indices (ordinary and extraordinary) are identical for the fundamental and the SH beam. In this process, the efficient conversion is very sensitive to the propagation direction of the fundamental beam. This angular dependence will be the basis to retrieve the wavefront of a ...
paper - Crescimanno page - Youngstown State University
... measure independently the absolute phase difference of the incoming lightfields across the TGG plate. The two traces in Fig. 4(a) are contrast maxima (with respect to modulator phase) for each laser detuning at small magnetic field (inset) and at a field above the CPR threshold. Although at small ma ...
... measure independently the absolute phase difference of the incoming lightfields across the TGG plate. The two traces in Fig. 4(a) are contrast maxima (with respect to modulator phase) for each laser detuning at small magnetic field (inset) and at a field above the CPR threshold. Although at small ma ...
5. Reflection, refraction and polarization
... Consider a beam with its polarization axis exactly halfway between the two (x and y) crystal axes incident upon a birefringent crystal, as illustrated in Figure 5.4. For the incident beam, the x- and y-components of the electric field have the same amplitude: E0/2⋅cos(ω(t -nairz/c)). Spatially, the ...
... Consider a beam with its polarization axis exactly halfway between the two (x and y) crystal axes incident upon a birefringent crystal, as illustrated in Figure 5.4. For the incident beam, the x- and y-components of the electric field have the same amplitude: E0/2⋅cos(ω(t -nairz/c)). Spatially, the ...
Through the Looking Glass
... “write” and “read” steps. (a) First, the film is exposed to the interference pattern formed by an undistorted reference beam with a distorted beam reflected off the object. The result, after development of the film, is the hologram, a grain pattern in the emulsion. (b) A second undistorted reference ...
... “write” and “read” steps. (a) First, the film is exposed to the interference pattern formed by an undistorted reference beam with a distorted beam reflected off the object. The result, after development of the film, is the hologram, a grain pattern in the emulsion. (b) A second undistorted reference ...
Lab 4: Diffraction of Light
... ter. One half of that number will give you the distance the holder and position it so that it is normal to the between the center of the pattern and the first diffrac- laser beam. Sketch and describe the diffraction pattion minimum. Measure the distance D between the tern. Calculate the angle by whi ...
... ter. One half of that number will give you the distance the holder and position it so that it is normal to the between the center of the pattern and the first diffrac- laser beam. Sketch and describe the diffraction pattion minimum. Measure the distance D between the tern. Calculate the angle by whi ...
Large Dispersive Effects near the Band Edges of Photonic Crystals
... 3 orders of magnitude larger than well-known values for ordinary glass. At the high-frequency side of the stop gap we find a branch of anomalous dispersion. This is quickly recognized in an experiment because the argument of H共v兲 becomes a parabola pointing up instead of down. The cubic coefficient ...
... 3 orders of magnitude larger than well-known values for ordinary glass. At the high-frequency side of the stop gap we find a branch of anomalous dispersion. This is quickly recognized in an experiment because the argument of H共v兲 becomes a parabola pointing up instead of down. The cubic coefficient ...
Ultrafast and High Resolution Crack Detection Using Fully
... interrogation of fiber Bragg grating (FBG) sensors with unprecedented measurement speed of tens of MHz [2]. This is made possible by using chromatic dispersion to largely stretch an ultrashort broadband optical pulse such that the FBG wavelength change can be mapped to a temporal waveform shift, whi ...
... interrogation of fiber Bragg grating (FBG) sensors with unprecedented measurement speed of tens of MHz [2]. This is made possible by using chromatic dispersion to largely stretch an ultrashort broadband optical pulse such that the FBG wavelength change can be mapped to a temporal waveform shift, whi ...
Analysis of the detective quantum efficiency of
... The resulting combined MTF, T,,(f), is given by the magnitude of the Fourier transform of L,(x). It should be noted that the effect of fl,,““’as well as the fact that the transmittancesdecreaseas a function of ‘angle,actually reducesthe LSF width, and therefore improves the MTF at the ...
... The resulting combined MTF, T,,(f), is given by the magnitude of the Fourier transform of L,(x). It should be noted that the effect of fl,,““’as well as the fact that the transmittancesdecreaseas a function of ‘angle,actually reducesthe LSF width, and therefore improves the MTF at the ...
Two-mode interference measurement for nanometer accuracy
... the slow drifts. This point can be seen by writing L − l∕2Λ L − l0 ∕Λ − L l − 2l0 ∕2Λ, where l0 is the path length on the PhD0 detection chain. Finally, we calculate the interferometric phase. For the procedure to be applicable, it has to fulfil two conditions. First, the three-fold patter ...
... the slow drifts. This point can be seen by writing L − l∕2Λ L − l0 ∕Λ − L l − 2l0 ∕2Λ, where l0 is the path length on the PhD0 detection chain. Finally, we calculate the interferometric phase. For the procedure to be applicable, it has to fulfil two conditions. First, the three-fold patter ...
Generation of lattices of optical vortices
... propagation of multiply charged OVSs'° is found to be unstable and the dark beams decay into vortices of unit charge1. ...
... propagation of multiply charged OVSs'° is found to be unstable and the dark beams decay into vortices of unit charge1. ...
MAMMOGRAPHIC DETECTORS
... 3.3.2. Photostimulable phosphors (Computed radiography systems) Photostimulable phosphors are commonly in the barium fluorohalide family, typically BaFBr:Eu+2, where the atomic energy levels of the europium activator determine the characteristics of light emission. X-ray absorption mechanisms are id ...
... 3.3.2. Photostimulable phosphors (Computed radiography systems) Photostimulable phosphors are commonly in the barium fluorohalide family, typically BaFBr:Eu+2, where the atomic energy levels of the europium activator determine the characteristics of light emission. X-ray absorption mechanisms are id ...
Accurate and Efficient Computation of Synchrotron Radiation in the
... emittance of the ESRF (horizontal and vertical emittances: 4 and 0.04 nm, beta functions: 0.5 and 2.5 m). The spot size in the image plane is dominated by the electron beam size rather than the single electron emission, and the peak value of the flux per unit surface becomes proportional to the ang ...
... emittance of the ESRF (horizontal and vertical emittances: 4 and 0.04 nm, beta functions: 0.5 and 2.5 m). The spot size in the image plane is dominated by the electron beam size rather than the single electron emission, and the peak value of the flux per unit surface becomes proportional to the ang ...
Low threshold edge emitting polymer distributed feedback laser based on
... with its wave vector 共兲, which is essentially the group velocity of the propagating mode. Furthermore, the laser resonance, which is supported by the grating vector G2, is in a spectral range that corresponds to an angle of = 90° and hence is edge coupled as was the case for the stimulated emissi ...
... with its wave vector 共兲, which is essentially the group velocity of the propagating mode. Furthermore, the laser resonance, which is supported by the grating vector G2, is in a spectral range that corresponds to an angle of = 90° and hence is edge coupled as was the case for the stimulated emissi ...
INTERFEROMETERS NOTE: Most mirrors in the apparatus are front
... interferometer consists of parallel semi-silvered glass plates, so that multiple reflections take place. This results in very narrow sharp interference fringes, allowing small wavelength differences to be measured. In particular, this interferometer has been used in the measurement of Zeeman effect ...
... interferometer consists of parallel semi-silvered glass plates, so that multiple reflections take place. This results in very narrow sharp interference fringes, allowing small wavelength differences to be measured. In particular, this interferometer has been used in the measurement of Zeeman effect ...
Mode-locked fiber laser gyroscope
... reflector is a function of the rotation rate or any nonreciprocal phase shift introduced between the counterpropagating waves in the Sagnac interferometer. A fiber-optic phase modulator located near one end of the fiber coil, as shown in Fig. 1(a), can be used to modulate the optical loss in the cav ...
... reflector is a function of the rotation rate or any nonreciprocal phase shift introduced between the counterpropagating waves in the Sagnac interferometer. A fiber-optic phase modulator located near one end of the fiber coil, as shown in Fig. 1(a), can be used to modulate the optical loss in the cav ...
Looking through walls and around corners with
... samples used are a 10x20° Newport light shaping diffuser (Fig.2), and a white paper sticker with a thickness of 70±10µm (Fig.3). A white-light tungsten-halogen source (Schott KL1500LCD) was used as the light source for imaging in transmission. For imaging in reflection, a narrow bandwidth pseudother ...
... samples used are a 10x20° Newport light shaping diffuser (Fig.2), and a white paper sticker with a thickness of 70±10µm (Fig.3). A white-light tungsten-halogen source (Schott KL1500LCD) was used as the light source for imaging in transmission. For imaging in reflection, a narrow bandwidth pseudother ...
Phase-contrast X-ray imaging
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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).