Beam Energy Exchange Dependence on Grating Period in Bismut Silicate (Bi12 SiO20 ) With Optical Activity and Linear Birefringence Under Strong Nonlinear Regime

2007 ◽  
Author(s):  
Fernando Magana ◽  
Isabel Casar ◽  
Jose Murillo ◽  
Rurik Farias ◽  
Arturo Zuñiga
Keyword(s):  
Optical Activity ◽  
Beam Energy ◽  
Energy Exchange ◽  
Grating Period ◽  
Nonlinear Regime ◽  
Linear Birefringence

scholarly journals Spatial-Frequency Azimuthally Stable Cartography of Biological Polycrystalline Networks

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
V. A. Ushenko ◽  
N. D. Pavlyukovich ◽  
L. Trifonyuk
Keyword(s):  
Spatial Frequency ◽  
Optical Activity ◽  
Polarization Plane ◽  
Biological Tissues ◽  
Uterine Wall ◽  
Beam Polarization ◽  
Linear Birefringence ◽  
Histological Sections ◽  
The Matrix ◽  
Anisotropic Structures

A new azimuthally stable polarimetric technique processing microscopic images of optically anisotropic structures of biological tissues histological sections is proposed. It has been used as a generalized model of phase anisotropy definition of biological tissues by using superposition of Mueller matrices of linear birefringence and optical activity. The matrix elementM44has been chosen as the main information parameter, whose value is independent of the rotation angle of both sample and probing beam polarization plane. For the first time, the technique of concerted spatial-frequency filtration has been used in order to separate the manifestation of linear birefringence and optical activity. Thereupon, the method of azimuthally stable spatial-frequency cartography of biological tissues histological sections has been elaborated. As the analyzing tool, complex statistic, correlation, and fractal analysis of coordinate distributions ofM44element has been performed. The possibility of using the biopsy of the uterine wall tissue in order to differentiate benign (fibromyoma) and malignant (adenocarcinoma) conditions has been estimated.

scholarly journals Impact of the Liquid Crystal Director Twisting on Two-Beam Energy Exchange in a Hybrid Photorefractive Inorganic-Liquid Crystal Cell

Crystals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1104
Author(s):  
Victor Yu. Reshetnyak ◽  
Igor P. Pinkevych ◽  
Michael E. McConney ◽  
Jonathan E. Slagle ◽  
Dean R. Evans
Keyword(s):  
Liquid Crystal ◽  
Beam Energy ◽  
Energy Exchange ◽  
Gain Coefficient ◽  
Liquid Crystal Cell ◽  
Helix Pitch ◽  
Propagation Of Light ◽  
Light Waves ◽  
Light Beams ◽  
Grating Spacing

We studied the energy transfer between light beams on the director grating in a hybrid photorefractive liquid crystal (LC) cell assuming the propagation of light waves in the cell to be in the Mauguin regime. This approach makes it possible to trace the change of the gain coefficient dependence on the director grating spacing with the change of the LC director twist. Conditions for the LC flexoelectric parameters and the director helix pitch necessary for transformation the gain coefficient dependence from the nematic to cholesteric type are obtained. The influence of the director splay and bend deformations on the gain coefficient is also studied.

scholarly journals Interference-contrast optical activity: a new technique for probing the chirality of anisotropic samples and more

2020 ◽  
Vol 7 (5) ◽  
pp. 192201 ◽  
Author(s):  
R. P. Cameron ◽  
U. Vogl ◽  
N. Trautmann
Keyword(s):  
Pharmaceutical Industry ◽  
Optical Activity ◽  
Optical Rotation ◽  
New Technique ◽  
Future Research ◽  
Linear Birefringence ◽  
New Class ◽  
Potential Applications ◽  
A New Technique ◽  
Chiral Crystals

We introduce interference-contrast optical activity (ICOA) as a new technique for probing the chirality of anisotropic samples and more. ICOA could underpin a new class of ‘chiral microscopes’, with potential applications spanning the range of chirality and beyond. Two possible versions of ICOA are described explicitly; one designed to probe the optical rotation of a transparent sample regardless of the sample’s linear birefringence (ICOA-OR) and another designed to probe gradients in the optical rotation of a transparent sample (ICOA-GOR). Simulated results for α -quartz lead us to suggest that ICOA-GOR might be applied to help monitor the growth of chiral crystals in the pharmaceutical industry. Possible directions for future research are highlighted.

Stokes Mueller Treatment of Artifacts in Natural Raman Optical Activity

1987 ◽  
Vol 41 (2) ◽  
pp. 295-307 ◽  
Author(s):  
L. Hecht ◽  
B. Jordanov ◽  
B. Schrader
Keyword(s):  
Raman Scattering ◽  
Optical Activity ◽  
Linear Birefringence ◽  
Chiral Molecules ◽  
Sample Cell ◽  
Raman Optical Activity ◽  
Angle Scattering ◽  
The Matrix ◽  
Phase Sensitive ◽  
First Time

A description of Raman scattering based on the theory by Barron and on Stokes Mueller formalism was developed into a uniform mathematical calculus such that Raman scattering can now be easily represented by a simple phenomenological matrix. This matrix, the Mueller matrix of a modulator driven by a square-wave voltage, and the matrix for a laser regarded as a fictitious polarizer are presented for the first time. With the use of these three matrices and the ones for the analyzer, the polarizer, the linearly birefringent sample cell, the circularly birefringent sample, and the partially polarizing detector, the main reasons for the appearance of artifacts in Raman optical activity have been identified. On the basis of a calculation for right-angle scattering of an isotropic solution of chiral molecules, sources of artifacts appear to be the linear birefringence of the cell walls and of the modulator material. Phase-sensitive detection is found to observe Raman optical activity with a minimal number of artifacts.

Photorefractive energy exchange requiring optical activity and an electric field

1989 ◽  
Vol 14 (14) ◽  
pp. 740 ◽  
Author(s):  
D. Rouède ◽  
N. Kukhtarev ◽  
G. Khitrova ◽  
L. Wang ◽  
H. M. Gibbs
Keyword(s):  
Electric Field ◽  
Optical Activity ◽  
Energy Exchange
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