Shaping the intensity and degree of coherence of a partially coherent beam by a 4foptical system with an amplitude filter

2017 ◽  
Vol 19 (12) ◽  
pp. 124010 ◽  
Author(s):  
Tengfei Wu ◽  
Chunhao Liang ◽  
Fei Wang ◽  
Yangjian Cai
Keyword(s):  
Coherent Beam ◽  
Partially Coherent ◽  
Degree Of Coherence

scholarly journals Partially Coherent Flat-Topped Beam Generated by an Axicon

2019 ◽  
Vol 9 (7) ◽  
pp. 1499 ◽  
Author(s):  
Minghui Zhang ◽  
Xianlong Liu ◽  
Lina Guo ◽  
Lin Liu ◽  
Yangjian Cai
Keyword(s):  
Correlation Function ◽  
Intensity Distribution ◽  
Focal Depth ◽  
Coherent Beam ◽  
Particle Trapping ◽  
Spatial Profile ◽  
Partially Coherent ◽  
Degree Of Coherence ◽  
Focal Shift ◽  
Percussion Drilling

The intensity distribution of a partially coherent beam with a nonconventional correlation function, named the multi-Gaussian Schell-model (MGSM) beam, focused by an axicon was investigated in detail. Our numerical results showed that an optical needle with a flat-topped spatial profile and long focal depth was formed and that we can modulate the focal shift and focal depth of the optical needle by varying the width of the degree of coherence (DOC) and the parameters of the correlation function. The adjustable optical needle can be applied for electron acceleration, particle trapping, fiber coupling and percussion drilling.

scholarly journals Generation and Propagation of a Hermite-Gaussian Correlated Schell-Model LG0l Beam

2019 ◽  
Vol 9 (3) ◽  
pp. 610 ◽  
Author(s):  
Xiaofeng Peng ◽  
Xingyuan Lu ◽  
Xianlong Liu ◽  
Chenliang Zhao ◽  
Rong Lin ◽  
...  
Keyword(s):  
Coherence Length ◽  
Coherent Beam ◽  
Statistical Properties ◽  
Vortex Phase ◽  
Partially Coherent ◽  
Degree Of Coherence ◽  
Combined Action ◽  
Coherence Width

A partially coherent beam under the combined action of a Hermite-Gaussian correlated function and vortex phase, named the HGCSMLG0l beam has been explored both theoretically and experimentally. The statistical properties, such as the intensity and distribution of the degree of coherence (DOC) on propagation are analyzed in detail, based on the deduced equations. We find that the intensity is determined dominantly by the non-conventional correlated function when the coherence length is comparatively small and by vortex phase when the coherence length is large. The modulus of the DOC is not vulnerable to coherence width, rather, it is affected by both non-conventional correlated function and vortex phase. Our results are verified well by the experiment results.

scholarly journals Independently Controlling Stochastic Field Realization Magnitude and Phase Statistics for the Construction of Novel Partially Coherent Sources

Photonics ◽  
2021 ◽  
Vol 8 (2) ◽  
pp. 60
Author(s):  
Milo W. Hyde
Keyword(s):  
Coherent Beam ◽  
Optical Field ◽  
Stochastic Field ◽  
Partially Coherent ◽  
Second Moments ◽  
Coherent Beams ◽  
Gaussian Statistics ◽  
Simulated Field ◽  
Gaussian Moment ◽  
Partially Coherent Beams

In this paper, we present a method to independently control the field and irradiance statistics of a partially coherent beam. Prior techniques focus on generating optical field realizations whose ensemble-averaged autocorrelation matches a specified second-order field moment known as the cross-spectral density (CSD) function. Since optical field realizations are assumed to obey Gaussian statistics, these methods do not consider the irradiance moments, as they, by the Gaussian moment theorem, are completely determined by the field’s first and second moments. Our work, by including control over the irradiance statistics (in addition to the CSD function), expands existing synthesis approaches and allows for the design, modeling, and simulation of new partially coherent beams, whose underlying field realizations are not Gaussian distributed. We start with our model for a random optical field realization and then derive expressions relating the ensemble moments of our fields to those of the desired partially coherent beam. We describe in detail how to generate random optical field realizations with the proper statistics. We lastly generate two example partially coherent beams using our method and compare the simulated field and irradiance moments theory to validate our technique.

Shaping the beam profile of a partially coherent beam by a phase aperture

2011 ◽  
Vol 284 (18) ◽  
pp. 4129-4135 ◽  
Author(s):  
Gaofeng Wu ◽  
Yangjian Cai ◽  
Jun Chen
Keyword(s):  
Coherent Beam ◽  
Beam Profile ◽  
Partially Coherent

scholarly journals Suppression of intensity fluctuations in free space high-speed optical communication based on spectral encoding of a partially coherent beam

2007 ◽  
Vol 280 (2) ◽  
pp. 264-270 ◽  
Author(s):  
Gennady P. Berman ◽  
Alan R. Bishop ◽  
Boris M. Chernobrod ◽  
Dinh C. Nguyen ◽  
Vyacheslav N. Gorshkov
Keyword(s):  
Optical Communication ◽  
Free Space ◽  
High Speed ◽  
Coherent Beam ◽  
Partially Coherent ◽  
Spectral Encoding ◽  
Intensity Fluctuations
Sign in / Sign up

Export Citation Format

Share Document