• Study Resource
  • Explore
    • Arts & Humanities
    • Business
    • Engineering & Technology
    • Foreign Language
    • History
    • Math
    • Science
    • Social Science

    Top subcategories

    • Advanced Math
    • Algebra
    • Basic Math
    • Calculus
    • Geometry
    • Linear Algebra
    • Pre-Algebra
    • Pre-Calculus
    • Statistics And Probability
    • Trigonometry
    • other →

    Top subcategories

    • Astronomy
    • Astrophysics
    • Biology
    • Chemistry
    • Earth Science
    • Environmental Science
    • Health Science
    • Physics
    • other →

    Top subcategories

    • Anthropology
    • Law
    • Political Science
    • Psychology
    • Sociology
    • other →

    Top subcategories

    • Accounting
    • Economics
    • Finance
    • Management
    • other →

    Top subcategories

    • Aerospace Engineering
    • Bioengineering
    • Chemical Engineering
    • Civil Engineering
    • Computer Science
    • Electrical Engineering
    • Industrial Engineering
    • Mechanical Engineering
    • Web Design
    • other →

    Top subcategories

    • Architecture
    • Communications
    • English
    • Gender Studies
    • Music
    • Performing Arts
    • Philosophy
    • Religious Studies
    • Writing
    • other →

    Top subcategories

    • Ancient History
    • European History
    • US History
    • World History
    • other →

    Top subcategories

    • Croatian
    • Czech
    • Finnish
    • Greek
    • Hindi
    • Japanese
    • Korean
    • Persian
    • Swedish
    • Turkish
    • other →
 
Profile Documents Logout
Upload
Influence of structural disorder on Raman scattering in amorphous
Influence of structural disorder on Raman scattering in amorphous

... with 70% porosity and 2 m m thickness. To obtain an amorphous layer, irradiation by 10B 1 ions with the energy 100 keV was performed. For such ions the amorphization dose of the porous silicon was 531015 cm 22 ; this is one order of magnitude less than the same parameter for the ordinary silicon. Th ...
A method for controlling the bandwidth of high-energy, few
A method for controlling the bandwidth of high-energy, few

... as a consequence of laser-beam collimation. Furthermore, long absorption paths can be analyzed using multiple back-and-forth reflections inside multiple-path absorption cells. Finally, it is possible to tune the laser wavelength very fast over the whole spectral region to match the molecular absorpt ...
optical pumping of rubidium
optical pumping of rubidium

... If the HF irradiation is strong enough, population equilibrium of the corresponding Zeeman levels is forced and, as a result, a deviation from pumping equilibrium. In the other case, the frequency of the irradiating HF field can be slowly varied at constant magnetic field strength. Here, the absorpt ...
Theoretical study on Brillouin fiber laser sensor Omer Kotlicki, Jacob Scheuer,
Theoretical study on Brillouin fiber laser sensor Omer Kotlicki, Jacob Scheuer,

... Figure 4 illustrates a schematic of a superluminal Brillouin ring laser setup. The continuous wave (CW) pump beam is launched into the ring laser via a circulator, thus ensuring it would not resonate within the ring laser. For the Brillouin amplification, which occurs for a probe in the opposite dir ...
Holographic particle image velocimetry
Holographic particle image velocimetry

... All efforts connected to large-aperture optics in traditional imaging can be avoided. Real-image reconstruction may also be employed for the successful compensation of aberrations from difficult environments or low-cost relay imaging which is often applied to improve the geometry of the set-up. For ...
[pdf]
[pdf]

... In single-scattering experiments, all observed photons travel nearly the same distance to the detector, and the scattering angle is well known. In DWS, however, photon path lengths are typically distributed over several centimeters. The detected photons have scattered many times, through all possibl ...
Automotive Optical Solutions for the Automotive
Automotive Optical Solutions for the Automotive

... NIR Bandpass Filters SP are used in various optical sensor applications for blocking both ambient visible and longer wavelength infrared light while selectively transmitting the signal light of a specified near infrared (NIR) spectral range used for the sensing application. NIR Bandpass Filters SP a ...
Technology for a better society
Technology for a better society

... The objective diaphragm cuts off all values of u (spatial frequencies) greater than (higher than) some selected value governed by the radius of the aperture. ...
Analysis of Optical Systems I
Analysis of Optical Systems I

... the boundary, the field amplitudes of which decay exponentially with distance. Because of the existence of this evanescent wave, other optical components should not be brought too close to a totally reflecting surface, or energy will be coupled to them via the evanescent wave and the efficiency of t ...
1.5 MB
1.5 MB

... The relative orientation of the vortex with regard to the intensity maximum depends both on the sign of the vortex topological charge m and the sign ± in Δδ = ±90°. If the sign of m is positive then for Δδ = +90° the vortex moves up with the intensity maximum appearing below it (see Fig. 10b), while ...
Optical and Quantum Communications—J. H. Shapiro, N. C. Wong
Optical and Quantum Communications—J. H. Shapiro, N. C. Wong

... Dual-Beam High-Flux Polarization Entanglement Source In recent years most entanglement sources are based on spontaneous parametric downconversion (SPDC) in a noncollinearly propagating, angle phase-matched crystal, such as beta barium borate (BBO) [8]. We have recently taken a different approach to ...
17 Ophthalmic Instruments and Diagnostic Tests
17 Ophthalmic Instruments and Diagnostic Tests

... All types of heterophorias and heterotropias can be measured accurately with a synoptophore (both objective and subjective angle of squint). In the synoptophore the rays of light from the target hit a mirror and then pass through a convex lens of + 6.5 diopters to reach the eye. Thus the image is se ...
An ultrasmall wavelength-selective channel drop switch
An ultrasmall wavelength-selective channel drop switch

... and calculations are shown by solid and dotted curves, respectively, after normalization by their maximum values. The measured drop efficiency increases by about 18 dB from the off-resonant condition around 1.565 ␮m, and it becomes maximum at the resonant wavelength of 1.5724 ␮m and decreases sharpl ...
Integrated optical pressure sensors in silicon-on
Integrated optical pressure sensors in silicon-on

... the ring resonator shows slightly less sensitivity, it not only requires a smaller footprint - a MachZehnder always needs a reference arm - but it also exhibits sharper resonant features which benefits the resolution of readout. An advantage of the Mach-Zehnder interferometer is that, when suitably ...
Document
Document

... •Pump and Stokes wave propagate in opposite directions. •Does not typically cause interaction between different wavelengths. •Creates distortion in a single channel. •Depletes the transmitted signal. •The opposite traveling Stokes wave means the transmitter needs an isolator ...
Fifty years of laser: world and Latvian experience
Fifty years of laser: world and Latvian experience

... (optical communications, laser fusion, optical high precision clocks, optical information recording and processing, lidars, optical ranging, material processing, laser weapons, etc.). Laser technology promises also the solution for nuclear waste transformation problem because lasers with intensity h ...
Optical device having equal length waveguide paths
Optical device having equal length waveguide paths

... operation, coupler 11 receives light at Pi from an input Waveguide 13, and coupler 12 distributes received light to a pair of output Waveguides 14 and 15 near P0. The array of ...
Concepts for the simulation of volume and surface scattering based
Concepts for the simulation of volume and surface scattering based

... components and associated modeling techniques. • Field tracing allows inclusion of any component with any associated modeling technique. • In order to take maximum benefit of this field tracing capability, VirtualLab™ provides a programmable component which can be used together with all other compon ...
Get PDF - OSA Publishing
Get PDF - OSA Publishing

... assume Ω c  Ωc  Ωc . Subsequently, as shown in Figs. 3–7, we obtained a few numerical results for the steady behavior of the input–output field intensity with different values of the relevant parameters to illustrate that controllable OB and OM can be achieved in the present four-level Y-type ato ...
Optical Basicity and Polarizability of Nd3+
Optical Basicity and Polarizability of Nd3+

... by estimating the electronic oxide ion polarizability, optical basicity and metallization criterion based on the refractive index and energy gap. Since the optical nonlinearity is the cause of electronic polarization of the glass upon exposure to intense light beams, polarizability is the most impor ...
Equilibrium Mode Distribution and Steady State Distribution in Step
Equilibrium Mode Distribution and Steady State Distribution in Step

... represents power transfer from lower to higher order modes caused by fiber impurities and inhomogeneities introduced during the fiber manufacturing process (such as microscopic bends, irregularity of the core-cladding boundary and refractive index distribution fluctuations). In the absence of these ...
A tunable low-energy photon source for high
A tunable low-energy photon source for high

... photon energies used at synchrotrons, sit close to the minimum of the so-called “universal curve” describing the inelastic mean free path of photoexcited electrons within a metal as a function of their kinetic energy.2, 3 Some benefits of using low-energy light sources therefore include an enhanced ...
Towards noninvasive glucose sensing using
Towards noninvasive glucose sensing using

... polarimetric measurements through the aqueous humor of the eye that can be related to blood glucose levels, and outlines the remaining outstanding challenges of this promising approach. With the exception of transparent ocular tissues, however, the human body is highly absorbing and scattering in th ...
Trends in Optical Fiber Sensors - IEEE Bombay Section Symposium
Trends in Optical Fiber Sensors - IEEE Bombay Section Symposium

... temperature, etc. • These systems have a poor ability to screen noise, leading to lower precision, but are simple and inexpensive systems. ...
Multimodal analysis of ocular inflammation using endotoxin
Multimodal analysis of ocular inflammation using endotoxin

... Unless stated otherwise, all mice used were female C57BL/6J strain (Harlan, UK), brought into the animal facility at 6 weeks of age and maintained on the open shelf with food and water ad libitum a week prior to procedure. Breeding pairs of C57BL/6 Ccr2-/- (B6.129S4Ccr2tm1Ifc/J) mice were a gift fro ...
< 1 ... 53 54 55 56 57 58 59 60 61 ... 166 >

Optical coherence tomography



Optical coherence tomography (OCT) is an established medical imaging technique that uses light to capture micrometer-resolution, three-dimensional images from within optical scattering media (e.g., biological tissue). Optical coherence tomography is based on low-coherence interferometry, typically employing near-infrared light. The use of relatively long wavelength light allows it to penetrate into the scattering medium. Confocal microscopy, another optical technique, typically penetrates less deeply into the sample but with higher resolution.Depending on the properties of the light source (superluminescent diodes, ultrashort pulsed lasers, and supercontinuum lasers have been employed), optical coherence tomography has achieved sub- micrometer resolution (with very wide-spectrum sources emitting over a ~100 nm wavelength range).Optical coherence tomography is one of a class of optical tomographic techniques. A relatively recent implementation of optical coherence tomography, frequency-domain optical coherence tomography, provides advantages in signal-to-noise ratio, permitting faster signal acquisition. Commercially available optical coherence tomography systems are employed in diverse applications, including art conservation and diagnostic medicine, notably in ophthalmology and optometry where it can be used to obtain detailed images from within the retina. Recently it has also begun to be used in interventional cardiology to help diagnose coronary artery disease. It has also shown promise in dermatology to improve the diagnostic process.
  • studyres.com © 2025
  • DMCA
  • Privacy
  • Terms
  • Report