Measurements of extreme physical phenomena by Fourier fringe analysis, a review: from sub-Ångstrom lattice distortion measurement to attosecond pulse phase measurement

2011 ◽  
Author(s):  
Mitsuo Takeda
Keyword(s):  
Lattice Distortion ◽  
Phase Measurement ◽  
Attosecond Pulse ◽  
Fringe Analysis ◽  
Pulse Phase ◽  
Physical Phenomena

Computer Controlled Pulse Phase Measurement System

1984 ◽  
Author(s):  
Michael Little ◽  
Leon Stevens ◽  
Thomas McEwen ◽  
Edward Jones
Keyword(s):  
Measurement System ◽  
Phase Measurement ◽  
Pulse Phase ◽  
Computer Controlled

scholarly journals Carrier envelope phase measurement of multi-cycle mid-infrared field and its application on attosecond pulse generation

2018 ◽  
Vol 96 (5) ◽  
pp. 501-512
Author(s):  
Liqiang Feng ◽  
Wenliang Li
Keyword(s):  
Measurement Technique ◽  
Near Infrared ◽  
Phase Measurement ◽  
Pulse Generation ◽  
Attosecond Pulse ◽  
X Rays ◽  
Mid Infrared ◽  
Carrier Envelope Phase ◽  
Attosecond Pulse Generation

A method for the carrier envelope phase (CEP) measurement of the multi-cycle mid-infrared field has been theoretically presented by using the CEP dependence of the harmonic cutoffs. It shows that by properly adding a CEP-known few-cycle near-infrared pulse to the multi-cycle mid-infrared field, the CEP dependence of the harmonic cutoffs from the combined field become much more distinct in comparison with those from the single mid-infrared field, which provides a route to a new CEP measurement technique. Further, by properly controlling the combined field, three supercontinua of 230, 242, and 266 eV with less modulation can be obtained. Finally, by selecting the generated harmonics, a series of sub-35 as pulses in the X-rays region can be produced.

Measurements of Extreme Physical Phenomena by Fourier Fringe Analysis

2010 ◽  
Author(s):  
Mitsuo Takeda ◽  
Pramod K. Rastogi ◽  
Erwin Hack
Keyword(s):  
Fringe Analysis ◽  
Physical Phenomena

Femtosecond pulse phase measurement by spectrally resolved up-conversion: application to continuum compression

1992 ◽  
Vol 28 (10) ◽  
pp. 2285-2290 ◽  
Author(s):  
J.-P. Foing ◽  
J.-P. Likforman ◽  
M. Joffre ◽  
A. Migus
Keyword(s):  
Femtosecond Pulse ◽  
Phase Measurement ◽  
Pulse Phase ◽  
Spectrally Resolved

The Interpretation of Line Profiles

1977 ◽  
Vol 36 ◽  
pp. 191-215
Author(s):  
G.B. Rybicki
Keyword(s):  
Magnetic Fields ◽  
Atomic Physics ◽  
Velocity Fields ◽  
Spectral Lines ◽  
Inhomogeneous Structure ◽  
The Sun ◽  
Line Profiles ◽  
Physical Phenomena

Observations of the shapes and intensities of spectral lines provide a bounty of information about the outer layers of the sun. In order to utilize this information, however, one is faced with a seemingly monumental task. The sun’s chromosphere and corona are extremely complex, and the underlying physical phenomena are far from being understood. Velocity fields, magnetic fields, Inhomogeneous structure, hydromagnetic phenomena – these are some of the complications that must be faced. Other uncertainties involve the atomic physics upon which all of the deductions depend.

TEM visualization of surface replicated acid and base catalyzed sol-gel glasses

1986 ◽  
Vol 44 ◽  
pp. 448-449
Author(s):  
George C. Ruben ◽  
Merrill W. Shafer
Keyword(s):  
Elevated Temperatures ◽  
Sol Gel ◽  
Basic Medium ◽  
Glass Transition Point ◽  
Structural Space ◽  
Acid And Base ◽  
Organometallic Precursors ◽  
New Processing ◽  
Gel Glasses ◽  
Physical Phenomena

Traditionally ceramics have been shaped from powders and densified at temperatures close to their liquid point. New processing methods using various types of sols, gels, and organometallic precursors at low temperature which enable densificatlon at elevated temperatures well below their liquidus, hold the promise of producing ceramics and glasses of controlled and reproducible properties that are highly reliable for electronic, structural, space or medical applications. Ultrastructure processing of silicon alkoxides in acid medium and mixtures of Ludox HS-40 (120Å spheres from DuPont) and Kasil (38% K2O &62% SiO2) in basic medium have been aimed at producing materials with a range of well defined pore sizes (∼20-400Å) to study physical phenomena and materials behavior in well characterized confined geometries. We have studied Pt/C surface replicas of some of these porous sol-gels prepared at temperatures below their glass transition point.

SPECTRA: A program for processing electron images of crystals

1992 ◽  
Vol 50 (1) ◽  
pp. 132-133
Author(s):  
M.F. Schmid ◽  
R. Dargahi ◽  
M. W. Tam
Keyword(s):  
Lattice Distortion ◽  
Data Transfer ◽  
Reciprocal Lattice ◽  
Data Entry ◽  
Image Data ◽  
Distortion Correction ◽  
Specimen Preparation ◽  
Electron Image ◽  
Computer Controlled ◽  
Program Modules

Electron crystallography is an emerging field for structure determination as evidenced by a number of membrane proteins that have been solved to near-atomic resolution. Advances in specimen preparation and in data acquisition with a 400kV microscope by computer controlled spot scanning mean that our ability to record electron image data will outstrip our capacity to analyze it. The computed fourier transform of these images must be processed in order to provide a direct measurement of amplitudes and phases needed for 3-D reconstruction.In anticipation of this processing bottleneck, we have written a program that incorporates a menu-and mouse-driven procedure for auto-indexing and refining the reciprocal lattice parameters in the computed transform from an image of a crystal. It is linked to subsequent steps of image processing by a system of data bases and spawned child processes; data transfer between different program modules no longer requires manual data entry. The progress of the reciprocal lattice refinement is monitored visually and quantitatively. If desired, the processing is carried through the lattice distortion correction (unbending) steps automatically.

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