scholarly journals Topological charge of two parallel Laguerre-Gaussian beams

2021 ◽  
Author(s):  
Victor Kotlyar ◽  
Alexey Kovalev ◽  
POURIA AMIRI ◽  
Peyman Soltani ◽  
Saifollah Rasouli
Keyword(s):  
Topological Charge ◽  
Gaussian Beams

Conservation of the half-integer topological charge on propagation of a superposition of two Bessel-Gaussian beams

2021 ◽  
Vol 104 (3) ◽  
Author(s):  
V. V. Kotlyar ◽  
A. A. Kovalev ◽  
A. G. Nalimov
Keyword(s):  
Topological Charge ◽  
Gaussian Beams ◽  
Half Integer

Topological charge inversion in polynomial astigmatic Gaussian beams

2008 ◽  
Vol 281 (17) ◽  
pp. 4205-4210 ◽  
Author(s):  
Filippus S. Roux
Keyword(s):  
Topological Charge ◽  
Gaussian Beams ◽  
Charge Inversion

scholarly journals Fine structure of perturbed Laguerre–Gaussian beams: Hermite–Gaussian mode spectra and topological charge

2020 ◽  
Vol 59 (25) ◽  
pp. 7680 ◽  
Author(s):  
A. Volyar ◽  
E. Abramochkin ◽  
Yu. Egorov ◽  
M. Bretsko ◽  
Ya. Akimova
Keyword(s):  
Fine Structure ◽  
Topological Charge ◽  
Gaussian Beams ◽  
Gaussian Mode

scholarly journals Sorting Laguerre-Gaussian beams by radial numbers via intensity moments

2020 ◽  
Vol 44 (2) ◽  
pp. 155-166
Author(s):  
A.V. Volyar ◽  
M. Bretsko ◽  
Ya. Akimova ◽  
Yu. Egorov
Keyword(s):  
Spectral Line ◽  
Information Entropy ◽  
Topological Charge ◽  
Amplitude Spectrum ◽  
Gaussian Beams ◽  
Digital Analysis ◽  
Correlation Degree ◽  
Amplitude Spectra ◽  
A New Technique ◽  
Measure Of Uncertainty

We propose and experimentally implement a new technique for digitally sorting Laguerre-Gaussian (LG) modes by radial number at a constant topological charge, resulting from the pertur-bation of the original LG beam, or superposition thereof, by passing them through a thin dielectric diaphragm with various aperture radii. The technique is based on a digital analysis of higher-order intensity moments. Two types of perturbed beams are considered: non-degenerate and degenerate beams with respect to the initial radial number of the LG beam superposition. A diaphragm with a circular pinhole causes the appearance of a set of secondary LG modes with different radial num-bers, which are characterized by an amplitude spectrum. The digital amplitude spectrum makes it possible to recover the real LG modes and find the measure of uncertainty due to perturbation by means of information entropy. It is found that the perturbation of a complex beam leads to the appearance of a degenerate am-plitude spectrum since a single spectral line corresponds to a set of modes generated by M original Laguerre-Gaussian beams with different radial numbers. For the spectrum to be deciphered, we use M keys represented by the amplitude spectra of the nondegenerate perturbed beams in our ex-periment. However, the correlation degree decreases to 0.92.

Polynomial Gaussian beams and topological charge conservation

2006 ◽  
Vol 266 (2) ◽  
pp. 433-437 ◽  
Author(s):  
Filippus S. Roux
Keyword(s):  
Topological Charge ◽  
Gaussian Beams ◽  
Charge Conservation

A further comparative study of flattened Gaussian beams and super-Gaussian beams

2001 ◽  
Vol 48 (2) ◽  
pp. 371-377
Author(s):  
Baida Lü ◽  
Shirong Luo ◽  
Xiaoling Ji
Keyword(s):  
Comparative Study ◽  
Gaussian Beams

Modern optics of Gaussian beams

2012 ◽  
Vol 182 (4) ◽  
pp. 442 ◽  
Author(s):  
Vladimir G. Volostnikov
Keyword(s):  
Gaussian Beams

Laser Oscillation in Aggregates of Ultrasmall Si Nanoparticles

2002 ◽  
Vol 728 ◽  
Author(s):  
Munir H. Nayfeh
Keyword(s):  
Stimulated Emission ◽  
Gaussian Beams ◽  
Single Particles ◽  
Nonlinear Characteristics ◽  
Femtosecond Radiation ◽  
Highly Nonlinear ◽  
Line Narrowing ◽  
Si Nanoparticles ◽  
Speckle Patterns ◽  
Spectral Line Narrowing

AbstractWe dispersed electrochemically etched Si into ultrabright ultrasmall nanoparticles, with brightness higher than fluorescein or rhodamine. The emission from single particles is readily detectable. Aggregates or films of the particles exhibit emission with highly nonlinear characteristics. We observe directed blue beams at ∼ 410 nm between faces of aggregates excited by femtosecond radiation at 780 nm; and at ∼ 610 nm from aggregates of red luminescent Si nanoparticles excited by radiation at 550-570 nm from a mercury lamp. Intense directed Gaussian beams, a pumping threshold, spectral line narrowing, and speckle patterns manifest the emission. The results are analyzed in terms of population inversion and stimulated emission in quantum confinement-induced Si-Si dimer phase, found only on ultrasmall Si nanoparticles. This microlasing constitutes an important step towards the realization of a laser on a chip.

Scintillation index of flat-topped Gaussian beams

2006 ◽  
Vol 45 (16) ◽  
pp. 3793 ◽  
Author(s):  
Yahya Baykal ◽  
Halil T. Eyyuboğlu
Keyword(s):  
Scintillation Index ◽  
Gaussian Beams
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