scholarly journals Polarization squeezing in degenerate parametric amplification of coherent light

2016 ◽  
Vol 30 (06) ◽  
pp. 1650055 ◽  
Author(s):  
Namrata Shukla ◽  
Ranjana Prakash
Keyword(s):  
Coherent State ◽  
Light Beam ◽  
Nonlinear Interaction ◽  
Parametric Amplification ◽  
Beam Intensity ◽  
Degree Of Polarization ◽  
Coherent Light ◽  
Phase Angles ◽  
Very High

We study polarization squeezing of a light beam initially in the coherent state using the nonlinear interaction Hamiltonian [Formula: see text]. For the degree of polarization squeezing, we use a definition written in the final form by the authors and also used in earlier papers. We find that the polarization squeezing can be very high and the degree of polarization squeezing can be less than unity by a very small amount. We achieve the polarization squeezing even for very low beam intensity under some conditions involving phase angles in the polarization modes.

Generation of a coherent light beam with precise and fast dynamic control of the state and degree of polarization

2017 ◽  
Vol 42 (15) ◽  
pp. 2898 ◽  
Author(s):  
Noé Ortega-Quijano ◽  
Julien Fade ◽  
François Parnet ◽  
Mehdi Alouini
Keyword(s):  
Light Beam ◽  
Dynamic Control ◽  
The State ◽  
Degree Of Polarization ◽  
Coherent Light ◽  
Fast Dynamic ◽  
Coherent Light Beam

Changing the Degree of Polarization of a Light Beam by Interferometric Path Information

2015 ◽  
Author(s):  
Mayukh Lahiri ◽  
Armin Hochrainer ◽  
Gabriela B. Lemos ◽  
Radek Lapkiewicz ◽  
Anton Zeilinger
Keyword(s):  
Light Beam ◽  
Degree Of Polarization ◽  
Path Information

Artificial Neural Network Approach for Solving Power Flow Problem: A Case Study of Ayede 132 KV Power System, Nigeria

2011 ◽  
Vol 367 ◽  
pp. 133-141
Author(s):  
P.B. Osofisan ◽  
J.O. Ilevbare
Keyword(s):  
Neural Network ◽  
Power System ◽  
Test Data ◽  
Power Flow ◽  
Flow Problem ◽  
High Accuracy ◽  
Voltage Phase ◽  
Phase Angles ◽  
Very High ◽  
Power Flow Problem

The main objective of this research work was to use Artificial Neural Network (ANN) based method for solving Power Flow Problem for a power system in Nigeria. This was achieved using the Backpropagation (multilayered feed-forward) Neural Network model. Two Backpropagation neural networks were designed and trained; one for computing voltage magnitudes on all buses and the other for computing voltage phase angles on all PV and PQ buses for different load and generation conditions for a 7-bus 132 kV power system in South-West Nigeria (Ayede). Due to unavailability of historical field records, data representing different scenarios of loading and/or generation conditions had to be generated using Newton-Raphson non-linear iterative method. A total of 250 scenarios were generated out of which 50% were used to train the ANNs, 25% were used for validation and the remaining 25% were used as test data for the ANNs. The test data results showed very high accuracy for the ANN used for computing voltage magnitudes for all test data with a Mean Square Error (MSE) of less than 10-6. Also, the ANN used for computing voltage phase angles showed very high accuracy in about 80% of the test data and acceptable results in about 97% of the test data. The MSE for all the test data results for the ANN computing voltage phase angles was less than 10-2.

Rotating-Compensator Multichannel Ellipsometry: Applications in Process Development for Nanocrystalline Diamond Thin Films

1997 ◽  
Vol 502 ◽  
Author(s):  
R. W. Collins ◽  
Joungchel Lee ◽  
P. I. Rovira ◽  
Ilsin An
Keyword(s):  
Thin Film ◽  
Light Beam ◽  
Time Evolution ◽  
Film Growth ◽  
Nanocrystalline Diamond ◽  
Thin Film Growth ◽  
Degree Of Polarization ◽  
S Wave ◽  
Diamond Thin Film ◽  
New Instrument

ABSTRACTA multichannel spectroscopic ellipsometer based on the rotating-compensator principle was developed and applied to characterize nanocrystalline diamond thin film growth processes by plasma-enhanced chemical vapor deposition (PECVD). With the newly-designed instrument, a time resolution of 32 ms is possible for spectra (1.5˜4.0 eV) in the Stokes vector of the light beam reflected from the surface of the growing film. Several advantages of the rotating-compensator over the simpler rotating-polarizer multichannel ellipsometer design are demonstrated here for diamond thin film growth. These include the ability to: (i) resolve the sign ambiguity in the p–s wave phase-shift difference Δ, (ii) obtain accurate Δ values for low ellipticity polarization states, and (iii) deduce spectra in the degree of polarization of the light beam reflected from the film/substrate. The degree of polarization has been applied to characterize the time evolution of light scattering during the nucleation of the diamond, as well as the time evolution of thickness non-uniformity over the probed area of the growing film. In this paper, a brief description of calibration and data reduction for the new instrument is also provided.

Wind refraction of a partly coherent light beam

1985 ◽  
Vol 15 (1) ◽  
pp. 121-124
Author(s):  
B A Aleshkevich ◽  
G D Kozhoridze ◽  
A N Matveev ◽  
S I Terzieva
Keyword(s):  
Light Beam ◽  
Coherent Light ◽  
Coherent Light Beam
Sign in / Sign up

Export Citation Format

Share Document