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Welcome to the Pubget Medical Subject Headings (MESH) browser. Click on a topic or subtopic below to explore related papers. In the gold box is the most recent paper about the current MESH term, and below are 20 related papers.
Interferometry (2):
Recent article
Interferometry
Abstract
Psychophysical tuning curves (PTCs) were measured for sinusoidal signals with frequency f(s) = 31.5, 40, 50, 63, and 80 Hz, using sinusoidal and narrowband-noise maskers. For the former, conditions were included where a pair of beating tones was added to reduce the use of cues related to beats. Est...
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PMID: 21568419
PDF is available here.
PDF is available here.
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Medical Physics (38)3 2011
Abstract
In this work, the authors investigate how beam hardening affects the image formation in x-ray phase-contrast imaging and consecutively develop a correction algorithm based on the results of the analysis.
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PMID: 21520831
PDF is available here.
PDF is available here.
Abstract
Immersion ultrasound, partial coherence interferometry, and low coherence reflectometry provided comparable ocular biometry measurements in cataractous eyes.
Copyright 2011, SLACK Incorporated....
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PMID: 21323302
PDF is available here.
PDF is available here.
Abstract
We report the use of an ultrahigh sensitive optical micro-angiography (UHS-OMAG) imaging system to image 3-D microvascular perfusion within the intact cochlea in living mice. The UHS-OMAG image system used in this study is based on spectral domain optical coherence tomography, which uses a broadband...
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PMID: 20813632
PDF is available here.
PDF is available here.
Optics Express (18)20 2010
Abstract
We carry out a complete spatio-temporal characterization of the electric field of an ultrashort laser pulse after passing through a diffractive optical element composed of several binary amplitude concentric rings. Analytical expressions for the total diffraction field in the time and spectral domai...
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PMID: 20940985
PDF is available here.
PDF is available here.
Optics Express (18)20 2010
Abstract
The paper deals with quantitative phase imaging of two-height-level surface reliefs. The imaging is considered to be a linear system and, consequently, the Fourier transform of the image is the product of the Fourier transform of a 2D function characterizing the surface and a specific 2D coherent tr...
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PMID: 20940953
PDF is available here.
PDF is available here.
Optics Express (18)20 2010
Abstract
A new method that extracts phase directly from randomly phase-shifted interferograms is proposed. In this method, the background intensity and the modulation amplitude are determined by a temporal method and used as the system parameters and then the phase is extracted from one single interferogram...
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PMID: 20940956
PDF is available here.
PDF is available here.
Abstract
The results in this analysis might provide normative data for cataract patients and a useful reference for multiple purposes. The correlation of AL with corneal radius, ACD, and corneal diameter in normal eyes was not present in eyes with extreme myopia or hyperopia.
Copyright (c) 2010 ASCRS and ESC...
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PMID: 20692558
PDF is available here.
PDF is available here.
Abstract
The precision of the PCI measurements was extremely high for AL with low fluctuations (95% limits of agreement [LoA], 0.06 mm) and was relatively high for K readings with higher fluctuations (95% LoA, 0.55 D) and for ACD (95% LoA, 0.2 mm). The precision of astigmatism and cylinder axis was high in f...
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PMID: 20692557
PDF is available here.
PDF is available here.
Optics Express (18)18 2010
Abstract
We report an endlessly single mode, fiber-optic confocal microscope, based on a large mode area photonic crystal fiber. The microscope confines a very broad spectral range of excitation and emission wavelengths to a single spatial mode in the fiber. Single-mode operation over an optical octave is fe...
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PMID: 20940774
PDF is available here.
PDF is available here.
Optics Express (18)18 2010
Abstract
We experimentally study the dependence of thin-film detection sensitivity on the optical geometrical parameters of tubes, different thicknesses and tube wall refractive indices, and on different resonant frequencies. A polypropylene hollow-tube with optimized sensitivity of 0.003 mm/μm is used to s...
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PMID: 20940830
PDF is available here.
PDF is available here.
Optics Express (18)18 2010
Abstract
We constructed a system of parallel two-step phase-shifting digital holography and experimentally demonstrated the technique, for the first time. The system uses an originally fabricated image sensor having an array of 2 × 1 micro polarizers. Each micro polarizer was attached on pixel by pixel. In...
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PMID: 20940791
PDF is available here.
PDF is available here.
Optics Express (18)18 2010
Abstract
We validate the quantitative analysis of Ronchigrams for wavefront sensing through detailed numerical simulations. Analysis of the experimental Ronchigrams provides the wavefront aberrations, the F/# of the beam and the distance of the Ronchi ruling from the paraxial focus. These retrieved parameter...
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PMID: 20940744
PDF is available here.
PDF is available here.
Optics Express (18)18 2010
Abstract
We demonstrate the use of Gires-Tournois interferometer (GTI) negative dispersion multilayer dielectric mirrors designed for pulse compression in the deep ultraviolet region. GTI mirror designs are more robust than chirped mirrors and, can provide sufficient bandwidth for the compression of sub-30-f...
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PMID: 20940753
PDF is available here.
PDF is available here.
Applied Optics (49)19 2010
Abstract
We have developed an interferometric synthetic aperture incoherent imaging system at 94 GHz, in which a high-power electronic millimeter wave source (Gunn Oscillator) is integrated with a continuous-wave terahertz (THz) photomixing detection system to achieve a high signal-to-noise ratio. Imaging of...
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PMID: 20648115
PDF is available here.
PDF is available here.
Abstract
Lateral shearing interferometry is a noninvasive technique that provides means for temporal characterization of tear film surface kinetics and the opportunity for the analysis of the two-step tear film build-up process....
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PMID: 20473236
PDF is available here.
PDF is available here.
Optics Letters (35)12 2010
Abstract
We describe an x-ray differential phase-contrast imaging method based on two-dimensional transmission gratings that are directly resolved by an x-ray camera. X-ray refraction and diffraction in the sample lead to variations of the positions and amplitudes of the grating fringes on the camera. These...
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PMID: 20548343
PDF is available here.
PDF is available here.
Optics Express (18)12 2010
Abstract
X-ray differential phase contrast imaging methods, including projection imaging and the corresponding computed tomography (CT), have been implemented using a Talbot interferometer and either a synchrotron beam line or a low brilliance x-ray source generated by a stationary-anode x-ray tube. From sma...
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PMID: 20588425
PDF is available here.
PDF is available here.
Optics Express (18)11 2010
Abstract
We present an experimental study showing the effect of the change in the bandwidth of light on the magnitude of both the complex degree of coherence and the spectral degree of coherence at a pair of points in the cross-section of a beam. A variable bandwidth source with a Young's interferometer is u...
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PMID: 20589045
PDF is available here.
PDF is available here.
Optics Express (18)11 2010
Abstract
Our results demonstrate that tracking instantaneous velocity can be used to compensate for distortion in the images due to motion artifacts, thus leading to accurate reconstruction and volumetric measurements with catheter-based imaging....
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PMID: 20589002
PDF is available here.
PDF is available here.
Optics Express (18)11 2010
Abstract
We have developed a self-contained theory for describing the signal produced by triangular FTSs and its optimal processing. We investigate the relevant disadvantages of multiplexing, and compare dispersive with FTS instruments. The paper addresses some methods for correcting the phase error, and the...
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PMID: 20589022
PDF is available here.
PDF is available here.
Optics Express (18)11 2010
Abstract
In this work a narrow linewidth (1 kHz) laser source is used to measure the free spectral range of a fiberized Fabry-Perot etalon with sub-Hz accuracy (10(-8)). A previously demonstrated technique based on the Pound-Drever-Hall error signal is improved in accuracy by the use of a narrow linewidth la...
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PMID: 20588986
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
We analyze the laser-self-mixing process in the Gaussian beam approximation and reformulate the expression of the feedback coefficient C in terms of the effective feedback power coupled back into the laser diode. Our model predicts a twenty-fold increase of the ratio between the maximum and the mini...
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PMID: 20588887
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
We demonstrate broadband all-optical modulation in low loss hydrogenated-amorphous silicon (a-Si:H) waveguides. Significant modulation (approximately 3 dB) occurs with a device of only 15 microm without the need for cavity interference effects in stark contrast to an identical crystalline silicon wa...
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PMID: 20588830
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
We propose an all-fiber hybrid cavity involving two unbalanced uniform fiber Bragg gratings (FBGs) written at both sides of a tilted FBG (TFBG) to form an all-fiber interferometer. This configuration provides a wavelength gated reflection signal with interference fringes depending on the cavity feat...
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PMID: 20588901
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
We present an interesting result of nonlinear light pulse propagation within a Mach-Zehnder Inteferometer (MZI) which can be used to extend the existed on off keying (OOK) techniques. The goal of this paper is OOK generation based on MZI incorporating a pumped nonlinear ring resonators system. We fi...
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PMID: 20588840
PDF is available here.
PDF is available here.
Abstract
The AS-OCT device showed a bias toward underestimation of ACD compared with the PCI device. The bias increased as ACD shallowed with pilocarpine, resulting in overestimation of forward IOL movement by AS-OCT. This may lead to overestimation of the accommodative performance of IOLs. The ACD measureme...
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PMID: 20457371
PDF is available here.
PDF is available here.
Abstract
In the 96 eyes evaluated, the MAE was correlated with cataract density (r = 0.37, P = .001) and the AL difference (r = 0.34, P = .003) but not with the other parameters. The AL difference was correlated with cataract density (r = 0.53, P<.0001). CONCLUSION: The postoperative refractive outcome was a...
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PMID: 20457373
PDF is available here.
PDF is available here.
Abstract
The proposed slow/rapid dichotomy of thinning rates presumably relates to a good/poor barrier to evaporation of the lipid layer. The imperfect correlation between thinning rate and lipid thickness indicates that other factors, such as the composition and structure of the lipid layer, are important (...
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PMID: 20019370
PDF is available here.
PDF is available here.
Optics Express (18)9 2010
Abstract
We developed a universal, real-time uniform K-space sampling (Rt-UKSS) method for high-speed swept-source optical coherence tomography (SS-OCT). An external clock uniform in K-space was generated. The clock was synchronized with the zero-crossing time of an interferometric calibration signal and use...
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PMID: 20588797
PDF is available here.
PDF is available here.
Abstract
Axial length was the most repeatable parameter and lens thickness the most variable. Axial length and corneal curvature measurements by IOLMaster and Lenstar LS 900 showed a good correlation (mean differences: 0.03 and 0.01 mm). Anterior chamber depth measurements by the two instruments resulted in...
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PMID: 20408075
PDF is available here.
PDF is available here.
Optics Letters (35)7 2010
Abstract
We study the interaction between a planar Fabry-Perot microcavity and a single embedded gold nanoparticle. We record spatially resolved white-light transmission spectra and show that the interaction between microcavity and nanoparticle gives rise to a redshift of the cavity modes, in accordance with...
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PMID: 20364181
PDF is available here.
PDF is available here.
Abstract
I collagen or hyaluronic acid (HA) were assessed. The addition of 1% (w/w) chlorhexidine diacetate in HA resulted in a 71% decrease in bacteria seen in nontreated HA. These results show promise in developing a novel engineered titanium and PCL construct that promotes effective adhesion between the t...
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PMID: 19769529
PDF is available here.
PDF is available here.
Optics Express (18)3 2010
Abstract
We introduce a label-free optical technique that allows non-perturbative characterization of localized intracellular dynamics. The method combines a field-based dynamic light scattering analysis with a confocal interferometric microscope to provide a statistical measure of the diffusive and directio...
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PMID: 20174115
PDF is available here.
PDF is available here.
Optics Express (18)3 2010
Abstract
We demonstrate that, for larger optical path lengths, the scattering coefficient of the static matrix in which the moving particles are embedded have a small to minimal effect on the measured fraction of Doppler shifted photons and on the measured average Doppler frequency of the Doppler shifted lig...
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PMID: 20174114
PDF is available here.
PDF is available here.
Optics Express (18)2 2010
Abstract
Measurement of strain is an important application of digital holographic interferometry. As strain relates to the displacement derivative, it depends on the derivative of the interference phase corresponding to the reconstructed interference field. The paper proposes an elegant method for direct mea...
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PMID: 20173875
PDF is available here.
PDF is available here.
Optics Express (18)2 2010
Abstract
We propose and demonstrate a pulsed-incoherent-light-injected Fabry-Perot laser diode (FP-LD) which generates incoherent return-to-zero (RZ) signals for wavelength-division-multiplexing passive optical networks. For the generation of the RZ signals, we first convert the continuous-wave (CW) amplifie...
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PMID: 20173999
PDF is available here.
PDF is available here.
Optics Express (18)2 2010
Abstract
We experimentally assess the validity of the symmetric decomposition of Mueller matrices [R. Ossikovski, J. Opt. Soc. Am A 26, 1109-1118 (2009)] into a sequence of five factors consisting of a diagonal depolarizer between two retarder and diattenuator pairs. The raw data were Mueller images of combi...
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PMID: 20173905
PDF is available here.
PDF is available here.
Optics Express (18)2 2010
Abstract
A widely tunable erbium-doped all-fiber laser has been demonstrated. The tunable mechanism is based on a novel tunable filter using multimode interference effects (MMI). The tunable MMI filter was applied to fabricate a tunable erbium-doped fiber laser via a standard ring cavity. A tuning range of 6...
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PMID: 20173879
PDF is available here.
PDF is available here.
Optics Express (18)2 2010
Abstract
We report line-by-line control of a coherent discrete spectrum (Raman sidebands) with a frequency spacing of 10.6 THz that is produced by an adiabatic Raman process. We show that the spectral phase of the Raman sidebands is finely controlled to the target (flat relative-spectral-phase). This is achi...
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PMID: 20173893
PDF is available here.
PDF is available here.
Optics Express (18)2 2010
Abstract
A high resolution heterodyne laser interferometer without periodic nonlinearity for linear displacement measurements is described. It uses two spatially separated beams with an offset frequency and an interferometer configuration which has no mixed states to prevent polarization mixing. In this rese...
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PMID: 20173939
PDF is available here.
PDF is available here.
Optics Express (18)2 2010
Abstract
We report preliminary results on the development of compact (length < 100 microm) fiber-coupled dielectric-loaded plasmonic waveguide components, including Mach-Zehnder interferometers (MZIs), waveguide-ring resonators (WRRs) and directional couplers (DCs), whose operation at telecom wavelengths is...
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PMID: 20173944
PDF is available here.
PDF is available here.
Abstract
PulseESPI may help in important corneal elasticity measurements used for complication-free optimized ophthalmic surgery. It seems to be a promising method to conduct stress-related investigations on biological samples. To our knowledge, this is the first time that PulseESPI has been used for such op...
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PMID: 20213620
PDF is available here.
PDF is available here.
Optics Letters (35)1 2010
Abstract
We present a method to image refractive index distribution within a sample across 8 mm dimension with high spatial resolution by a transmission low-coherence interferometer. The relative strong forward-scattering light is collected, from which the parallel projections of refractive indices within th...
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PMID: 20664683
PDF is available here.
PDF is available here.
Abstract
We extract this information from 3-D differential interference contrast (DIC) images by applying a texture detection method. Texture extraction methods have been successfully used in different applications to study biological samples. A 3-D texture image is obtained by applying a local entropy-based...
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PMID: 20799823
PDF is available here.
PDF is available here.
Optics Express (18)1 2010
Abstract
A multi-point laser Doppler velocimeter (LDV) using the arrayed waveguide gratings (AWGs) with small wavelength sensitivity (less than 1/10 of that for a conventional LDV without the AWGs) is proposed, in which velocities at different points in the depth direction can be simultaneously measured with...
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PMID: 20173850
PDF is available here.
PDF is available here.
Optics Express (18)1 2010
Abstract
We demonstrate a technique for generating azimuthally and radially polarized beams using a nematic liquid crystal spatial light modulator and a pi phase step. The technique is similar in concept to prior techniques that interfere TEM(01) and TEM(10) laser modes, but the presented technique removes t...
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PMID: 20173841
PDF is available here.
PDF is available here.
Optics Express (18)1 2010
Abstract
An all-optical regeneration scheme for DQPSK signals is proposed and analyzed. In the regenerator, an incoming DQPSK signal is demodulated to two parallel OOK signals by one-symbol delay interferometers. After the amplitude noise is removed by 2R (reamplifying and reshaping) regenerators and the pow...
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PMID: 20173816
PDF is available here.
PDF is available here.
Optics Express (18)1 2010
Abstract
Orbital angular momentum (OAM) of a helical beam is of great interests in the high density optical communication due to its infinite number of eigen-states. In this paper, an experimental setup is realized to the information encoding and decoding on the OAM eigen-states. A hologram designed by the i...
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PMID: 20173824
PDF is available here.
PDF is available here.
Abstract
We have investigated the spread in resonance frequency of different CMUT membranes along the array. Q-factors have been obtained using both measurement methods, and the results from the 2 methods have been numerically compared. The relation between applied dc voltage and resonance frequency has been...
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PMID: 20040408
PDF is available here.
PDF is available here.
Abstract
We describe a unique manufacturing practice that is used to guarantee the quality of control cell line slides provided for controlling the staining procedure and ensuring the validity of the reagent performance. An IHC control that could reflect variations in fixation, processing, section thickness,...
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PMID: 19417622
PDF is available here.
PDF is available here.
Optics Express (17)24 2009
Abstract
We present a method to make optical mosaic gratings that uses the exposure beams and the latent grating created by the previous exposure to adjust the lateral position and readjust the attitude of the substrate for the current exposure. As thus, it is a direct method without using any auxiliary refe...
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PMID: 19997394
PDF is available here.
PDF is available here.
Optics Express (17)24 2009
Abstract
We present a novel sample arm arrangement for dynamic optical coherence elastography based on excitation by a ring actuator. The actuator enables coincident excitation and imaging to be performed on a sample, facilitating in vivo operation. Sub-micrometer vibrations in the audio frequency range were...
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PMID: 19997419
PDF is available here.
PDF is available here.
Optics Express (17)24 2009
Abstract
We develop an interferometer which has high spectral sensitivity based on the dispersive property of the semiconductor GaAs in the near-infrared region. Our experiment demonstrates that the spectral sensitivity could be greatly enhanced by adding a slow light medium into the interferometer and is pr...
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PMID: 19997473
PDF is available here.
PDF is available here.
Optics Express (17)24 2009
Abstract
We present a technique with which the instability of the unconventional interferometer is suppressed while at the same time the time delay is controlled to within 20 as RMS using a feedback loop. Using this scheme, the streaked spectrogram of an attosecond pulse was measured....
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PMID: 19997386
PDF is available here.
PDF is available here.
Optics Express (17)24 2009
Abstract
We demonstrate continuous infrared spectra from 20 nm sample spots, by combining dispersive Fourier-transform infrared spectroscopy (FTIR) with scattering near-field microscopy (s-SNOM). With the "apertureless" tip of a standard AFM cantilever in one arm of a Michelson interferometer the spectra ari...
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PMID: 19997423
PDF is available here.
PDF is available here.
Optics Express (17)24 2009
Abstract
We have been reporting several new techniques of analysis and synthesis applied to Phase Shifting Interferometry (PSI). These works are based upon the Frequency Transfer Function (FTF) and how this new tool of analysis and synthesis in PSI may be applied to obtain very general results, among them; r...
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PMID: 19997431
PDF is available here.
PDF is available here.
Optics Express (17)24 2009
Abstract
An optimization of passive interferometric circular arrays for redundant spacing calibration (RSC) is advanced to eliminate phase errors of the array system. The principle of RSC is presented to solve corresponded constraints for passive interferometric circular arrays. The simulated annealing algor...
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PMID: 19997401
PDF is available here.
PDF is available here.
Analytical Biochemistry (399)2 2009
Abstract
We present a novel high-throughput approach, Binding Rate Screen, that can alleviate this bottleneck by screening expression constructs in crude soluble lysate. This functional screen utilizes the frequently employed hexahistidine (His(6)) tag as a reporter, and measures its binding rate to an affin...
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PMID: 19931214
PDF is available here.
PDF is available here.
Optics Express (17)23 2009
Abstract
We demonstrate a frequency comb (FC) swept laser and a frequency comb Fourier domain mode locked (FC-FDML) laser for applications in optical coherence tomography (OCT). The fiber-based FC swept lasers operate at a sweep rate of 1kHz and 120kHz, respectively over a 135nm tuning range centered at 1310...
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PMID: 19997365
PDF is available here.
PDF is available here.