Diffraction Grating
Diffraction Grating - Related Videos
08:48
Writing Bragg Gratings in Multicore Fibers
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Cited by 3 •
2016
We describe a technique for inscribing identical fiber Bragg gratings into each core of a multicore fiber. This is achieved by introducing an additional surface into the optical path to mitigate lensing by the curved surface of the fiber cladding.
09:31
X-ray Diffraction
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2023
Source: Faisal Alamgir, School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA X-ray diffraction (XRD) is a technique used in materials science for determining the atomic and molecular structure of a material. This is done by irradiating a sample of the material with incident X-rays and then measuring the intensities and scattering angles of the X-rays that are scattered by the material. The intensity of the scattered X-rays are plotted as a function of the...
02:18
Interference and Diffraction
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2020
Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other. Alternatively, if the two waves coincide and interact in a way such that the trough of one wave coincides with the peak of the other (in an out of phase manner), the resultant wave will...
08:41
Interference and Diffraction
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2023
Source: Yong P. Chen, PhD, Department of Physics & Astronomy, College of Science, Purdue University, West Lafayette, IN Interference and diffraction are characteristic phenomena of waves, ranging from water waves to electromagnetic waves such as light. Interference refers to the phenomenon of when two waves of the same kind overlap to give an alternating spatial variation of large and small wave amplitude. Diffraction refers to the phenomenon of when a wave passes through an aperture or...
10:39
Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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Cited by 10 •
2016
The measurement protocol and data analysis procedure are given for obtaining transverse coherence of a synchrotron radiation X-ray source along four directions simultaneously using a single 2-D checkerboard phase grating. This simple technique can be applied for complete transverse coherence characterization of X-ray sources and X-ray optics.
FAQs
Groove spacing determines the angles at which particular wavelengths reinforce one another. For a given wavelength, constructive interference occurs only at angles set by the relationship between that wavelength and the spacing. Changing the spacing therefore changes the angular separation of spectral lines, influencing how distinctly the instrument displays different components of the incident light.
When waves diffracted by neighboring grooves arrive in phase, they reinforce each other and produce a bright spectral line. At other angles, their contributions do not reinforce as strongly, so the pattern is not equally intense. This angle-dependent reinforcement converts differences in wavelength into spatially separated lines that a spectrometer can examine.
Resolution depends on how distinctly the grating produces separate spectral lines for nearby wavelengths. Because the lines appear at wavelength-dependent angles, a grating can reveal differences that would be difficult to distinguish if the signals overlapped. This capability supports elemental analysis and molecular characterization when the relevant atomic or molecular spectral features are examined.
In a chemical measurement, light can be examined through the grating to locate its spectral lines or wavelength-dependent absorption and emission features. Those observations provide evidence for the presence of particular substances and support identification through atomic or molecular spectra. The same spectral information also helps investigators characterize chemical composition rather than relying only on overall light intensity.
Atomic spectra provide wavelength patterns associated with elements, making the grating useful for elemental analysis. Molecular spectra provide patterns relevant to molecular characterization. By separating the wavelengths in either type of signal, the spectrometer gives chemistry researchers a way to distinguish composition-related features and select the type of spectral evidence most appropriate to the substance under investigation.
When a substance absorbs or emits light in a wavelength-dependent way, the separated spectral information can be related to that substance’s chemical signal. This makes the grating-based spectrometer useful not only for identifying what is present but also for measuring concentration. The approach relies on examining the relevant wavelength features rather than treating the light as a single undifferentiated signal.