Variation of the Hong-Ou-Mandel interference dip with crystal length

2021 ◽  
Author(s):  
Sandeep Singh ◽  
Varun Sharma ◽  
Vimlesh Kumar ◽  
G. K. Samanta
Keyword(s):  
Crystal Length

The research of laser crystal length impact on the self-Raman dual-wave length lasers output characteristics

Optik ◽  
2016 ◽  
Vol 127 (5) ◽  
pp. 3130-3133
Author(s):  
Xiao HeDong ◽  
Dong Yuan ◽  
Zhang Fengdong ◽  
Li Shutao ◽  
Yu Yongji ◽  
...  
Keyword(s):  
Laser Crystal ◽  
Wave Length ◽  
The Self ◽  
Crystal Length ◽  
Output Characteristics

scholarly journals Microcrystal alignment in drawn fiber over sub-meter to kilometer length scales

2021 ◽  
Vol 3 (4) ◽  
Author(s):  
Laurel Tauzer ◽  
Ann Mescher
Keyword(s):  
Aspect Ratio ◽  
Composite Fiber ◽  
Polymer Surfaces ◽  
Crystal Length ◽  
Cross Sectional ◽  
Length Scales ◽  
Grapeseed Oil ◽  
The Mean ◽  
Width Reduction ◽  
Uniform Reduction

AbstractThis paper describes a method for aligning stiff, high-aspect-ratio microcrystals over macro-length scales using a polymer fiber drawing process. A composite preform was constructed with an interfacial, liquid shell layer of grapeseed oil suspending ytterbium-doped potassium lutetium fluoride microcrystals (30% Yb:K2LuF5, KLF) between adjacent cylindrical surfaces of acrylic (polymethyl methacrylate, PMMA). The mean length of synthesized KLF microcrystals was 67 microns, and the mean aspect ratio, equivalent to crystal length divided by diameter, was eight. The acrylic-host preform was drawn into fiber, resulting in uniform reduction of all cross-sectional dimensions by a factor of approximately 20 in the final fiber. A corresponding width reduction of the interstitial liquid-filled gap, containing microcrystals between the polymer surfaces, constrains the microcrystals and causes alignment of the crystal long axes parallel to the axis of the drawn composite fiber. Alignment was best for clearly separated microcrystals and improved even further with the longest lengths, or highest aspect-ratio microcrystals.

scholarly journals Petrography and zircon morphology of syntectonic granitoids rocks of Hafafit area, South Eastern Desert (Egypt).

2013 ◽  
Vol 47 (1) ◽  
pp. 438 ◽  
Author(s):  
I. Thabet ◽  
A. Kilias ◽  
A. Koroneos ◽  
S. Kamh
Keyword(s):  
First Generation ◽  
Morphological Characteristics ◽  
Crystal Form ◽  
Eastern Desert ◽  
Elongation Ratio ◽  
Crystal Length ◽  
Rock Types ◽  
Two Generations ◽  
Granitoid Rocks ◽  
Zircon Morphology

The study deals with the petrography of the granitoid rocks intruding the five (A to E) domes of Hafafit Culmination. The morphological characteristics of zircon crystals are also examined, in order to elucidate the genesis of zircon and their host Hafafit granitoids. The granitoid rocks are tonalites, granodiorites and quartz diorites, all exhibiting gneissic texture. The zircon crystals from all the rock types intruding each one of the domes are examined in detail for colour, inclusions, crystal length, crystal width, elongation ratio, crystal form and habit, degree of roundness and corrosion, and are distinguished in groups on the basis of the previous characteristics. Two generations of zircons have been recognized; the first generation with magmatic features and the second one with post magmatic features. The first generation of zircon is attributed to the subduction, magmatic and deformation events while the second generation of zircon is attributed to metamorphism.

Texture constraints on crystal size distribution methodology: An application to the Laki fissure eruption

2020 ◽  
Vol 105 (5) ◽  
pp. 585-598
Author(s):  
Kim A. Cone ◽  
Richard F. Wendlandt ◽  
Katharina Pfaff ◽  
Omero F. Orlandini
Keyword(s):  
Electron Microscopy ◽  
Size Distribution ◽  
Crystal Size ◽  
Crystal Size Distribution ◽  
Size Distributions ◽  
Backscatter Electron ◽  
Crystal Length ◽  
Crystal Size Distributions ◽  
Length Measurements ◽  
Scanning Electron

Abstract Modeling crystal size distributions often requires the extraction of 2D discrete crystal lengths to calculate 3D volumetric equivalences. These apparent lengths are obtained from digital images that exploit different physical and chemical characteristics of samples, and the choice of image type can affect the interpretation of crystal length measurements, thus affecting crystal size distribution modeling. To examine method- and texture-based effects on extracting crystal size distributions, we obtained plagioclase length measurements from two texturally opposing basaltic lava samples from the well-documented Laki fissure eruptions of 1783–1784. Using approaches that consider inherent texture-based limitations of 2D image types, we employed manual tracing and imaging software to extract plagioclase crystal lengths from three types of images: (1) photomicrographs from polarized-light microscopy, (2) backscatter electron images from scanning electron microscopy, and (3) energy-dispersive X-ray maps from automated mineralogy. Our results demonstrate that (1) phenocrysts (L ≥ 150 μm) and groundmass plagioclase (L < 150 μm) in our basalt samples appear with multiple aspect ratios, while the latter also display greater nucleation densities as crystal size population are continuously refined over increasingly smaller crystal lengths; (2) complex crystal clusters must be manually dissected into their discrete crystal components to produce meaningful crystal size distributions; (3) localized electron backscatter diffraction analysis reveals mild preferred orientation in complex clusters and groundmass, the latter confirmed by variations in crystal size distributions between orthogonal backscatter electron images; and (4) method-induced variations in both aspect ratio and crystal length determination can produce a wide range of kinetic interpretations that pose challenges for cross-research comparisons. For phenocrysts, compensating for clustering and fracturing through manual tracing remains the most effective method, while groundmass populations can be addressed with high-resolution (micrometer-scale) automated scanning electron microscopy for deciphering late-stage eruptive behavior. A texture-focused protocol should be established, as any kinetic information derived from crystal size distribution analyses across multiple studies employing multiple approaches cannot otherwise be directly compared.

scholarly journals Diagenetic apatite character and in situ ion microprobe U–Pb age, Keeseville Formation, Potsdam Group, New York State

2017 ◽  
Vol 54 (7) ◽  
pp. 785-797 ◽  
Author(s):  
Quentin Gall ◽  
William J. Davis ◽  
David G. Lowe ◽  
Quinn Dabros
Keyword(s):  
New York ◽  
Fluid Flow ◽  
New York State ◽  
Ion Microprobe ◽  
Crystal Length ◽  
Aeolian Processes ◽  
York State ◽  
Orogenic Events ◽  
Obvious Source

An occurrence of diagenetic fluorapatite cement is documented within the Cambro-Ordovician Keeseville Formation, Potsdam Group, near Chateaugay in New York State. The fluorapatite cement occurs as stratiform layers within ephemeral fluvial quartz arenites, which have been reworked by aeolian processes prior to burial. The paragenetic sequence includes the following: compaction of dust-rimmed grains → quartz cementation → minor kaolinite → fluorapatite cementation followed by secondary dissolution porosity and telogenetic hematite cementation. Mesogenetic illitization of kaolinite may have taken place prior to or following fluorapatite cementation. The fluorapatite occurs as elongated bladed crystals that characteristically contain ladder-like, inclusion-rich cores running parallel to crystal length, surrounded by clearer rims, and larger blocky crystals towards the middle of interstices. In situ SHRIMP analyses of blocky fluorapatite crystals yield a U–Pb age of 486 ± 29 Ma, indicating that the cement formed during mesogenetic burial processes and (or) during fluid flow driven by Taconic orogenic events. There is no obvious source of phosphorous for the fluorapatite cement within the Potsdam Group, but phosphorous-rich lithologies are known from the adjacent basement of the Adirondack Dome. Phosphorous-rich fluids may have been derived from these basement lithologies. The occurrence of the rare fluorapatite cement in the Keeseville Formation adjacent to the Chateaugay Lake Fault raises the possibility that alkaline phosphatic fluids were focused within the fault and migrated laterally away from the fault into the host Keeseville Formation to form stratiform fluorapatite cement in the sandstone.

Anticlastic Curvature of Elastically Bent Crystals for Sagittal Focusing

1993 ◽  
Vol 307 ◽  
Author(s):  
J. P. Quintana ◽  
V. I. Kushnir ◽  
P. Georgopoulos
Keyword(s):  
Finite Element ◽  
Aspect Ratio ◽  
Boundary Conditions ◽  
Width Ratio ◽  
Crystal Length ◽  
Poisson Coefficient ◽  
Anticlastic Curvature ◽  
Bent Crystals

ABSTRACTFinite element results are presented for the case of an elastically bent isotropic rectangular crystal with clamped boundary conditions. Results show that the anticlastic curvature can be eliminated in the center of the crystal provided the crystal length to width ratio fits a “golden aspect ratio” which is dependent on the Poisson coefficient ν. For ν=0.262 (appropriate for Si(111)), this ratio is approximately equal to 1.42.

Effect of Gaussian Aperture Width on Visibility for Different Crystal Length

2011 ◽  
Vol 14 (2) ◽  
pp. 109-115
Author(s):  
Adawiya J. Haider ◽  
◽  
Muslm Fadhel J ◽  
Keyword(s):  
Crystal Length ◽  
Aperture Width
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