Radially polarized Bessel-Gauss beams: decentered Gaussian beam analysis and experimental verification

Schimpf, Damian N.; Putnam, William P.; Grogan, M. D. W.; Ramachandran, Siddharth; Kärtner, Franz X.

doi:10.1364/oe.21.018469

Cited by 21 publications

(19 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Radially polarized light can be described as a solution of the wave-equation in cylindrical coordinate system [20][21][22][23] . Its transverse electric field component is given in the form.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…While such beams are probably the most common form of coherent light source, we are recently witnessing a growing interest in light with a spatially varying polarization, generally known as vector beams 20 . One of the many types of vector beams is the radially polarized mode, which exhibits a spatially varying polarization, with the transverse electric field directed outward from the optical axis, and which is an axial-symmetric solution to Maxwell's equations [21][22][23] . Now implemented in different systems, radially polarized light was proved to be efficient in nano-focusing [24][25][26][27][28][29] , microscopy and particle manipulations 30 .…”

mentioning

confidence: 99%

See 1 more Smart Citation

Unveiling the Propagation Dynamics of Self-Accelerating Vector Beams

David

Bloch

Mazurski

et al. 2016

Conference on Lasers and Electro-Optics

View full text Add to dashboard Cite

We study theoretically and experimentally the varying polarization states and intensity patterns of self-accelerating vector beams. It is shown that as these beams propagate, the main intensity lobe and the polarization singularity gradually drift apart. Furthermore, the propagation dynamics can be manipulated by controlling the beams' acceleration coefficients. We also demonstrate the self-healing dynamics of these accelerating vector beams for which sections of the vector beam are being blocked by an opaque or polarizing obstacle. Our results indicate that the self-healing process is almost insensitive for the obstacles' polarization direction. Moreover, the spatial polarization structure also shows selfhealing properties, and it is reconstructed as the beam propagates further beyond the perturbation plane. These results open various possibilities for generating, shaping and manipulating the intensity patterns and space variant polarization states of accelerating vector beams.

show abstract

Section: Theoretical Backgroundmentioning

confidence: 99%

mentioning

confidence: 99%

Unveiling the Propagation Dynamics of Self-Accelerating Vector Beams

David

Bloch

Mazurski

et al. 2016

Conference on Lasers and Electro-Optics

View full text Add to dashboard Cite

show abstract

“…By employing a tightly focusing chirped laser pulse [19] and an external magnetic field, [20] improving the energy gain has also been reported. [31][32][33] In most cases, Gaussian laser pulses have been employed for wakefield excitation and electron acceleration. [21][22][23] Helmholtz-Gaussian (HzG) beam is in turn the wave field described at the plane z = 0 by the product of a solution of the two-dimensional Helmholtz equation.…”

Section: Introductionmentioning

confidence: 99%

Electron acceleration in a homogeneous plasma by Bessel‐Gaussian and Gaussian pulses

Fallah

Khorashadizadeh

2018

Contributions to Plasma Physics

View full text Add to dashboard Cite

The process of electron acceleration by both Bessel-Gaussian (BG) and Gaussian (G) laser pulses has been investigated comparatively in a homogeneous plasma. Starting with the hydrodynamics fluid and the Maxwell's equations, the three corresponding equations could be acquired which allow us to evaluate electron density perturbations (n ′ e ), wakefield (E w ) and electron energy-gain (ΔW) respectively for both pulses. Here, the pulse duration and the electron plasma period are taken the same, and by utilizing the perturbation theory the proposed equations have been solved. The analytical results show that the wakefield which leads to electron acceleration, depends on pulse intensity (I), pulse length (L), pulse wavelength ( ) and plasma density (n). Furthermore, by comparing the outcomes, the BG pulse is found to be most suitable for wakefield excitation. The pertinent electron could be accelerated up to 90 MeV if I = 4 × 10 21 W/m 2 , L = 20 μm and n = 5.318 × 10 24 m −3 . Our results are in a good agreement with experimental data reported in literature.

show abstract

“…Equation (4) gives the power density of the thermal sources in the heat conduction equation that describes the temperature fi eld in the sample. The overall rate of dissipation for a BGLB [13] modulated at frequency Ω can be written in the form…”

Section: Introductionmentioning

confidence: 99%

Photodeflection Spectroscopy of Magnetoactive Superlattices Irradiated by Bessel–Gaussian Light Beams*

2015

View full text Add to dashboard Cite

535.13The mechanism for the formation of photodefl ection signals in magnetoactive superlattices irradiated by polarized modes of Bessel-Gaussian light beams is studied. The feasibility of controlling the spatial distribution of the temperature distribution in test samples with subsequent thermo-optical excitation of photodefl ection signals is established. A method is proposed for nondestructive monitoring of the geometrical parameters of magnetoactive superlattices by means of laser photodefl ection spectroscopy.Introduction. Laser photodefl ection spectroscopy is widely used in research on solids [1-3]. It is distinguished by its universality, high sensitivity, and relative ease of making measurements [4,5]. In this paper, a photodefl ection method is used to study short-period two-layer magnetoactive superlattices formed by cubic crystals of bismuth germanate (Bi 12 GeO 20 ) and bismuth silicate (Bi 12 SiO 20 ). Polarized TE-and TH-modes of Bessel-Gaussian light beams (BGLB) are used to excite thermoelastic oscillations in the samples [6,7].Laser photodefl ection spectroscopy is based on the conversion of the energy absorbed from a light beam in the volume of a sample into a thermal fi eld which produces a refractive index gradient in the sample and the surrounding medium. The defl ection from the horizontal of a low-power probe laser beam as it passes through the region with a nonuniform refractive index yields information on the optical, dissipative, thermal, and other characteristics of the sample.Determination of the BGLB Energy Loss Rate and of the Defl ection Angles. Let an amplitude modulated Bessel light beam, e.g., with TE-polarization, be incident normally on a magnetically active superlattice (Fig. 1) consisting of cubic crystals such as bismuth germanate or bismuth silicate. In the long-wavelength approximation [8,9] a two-layer superlattice can be represented as a single-layer crystal with its optical axis perpendicular to the boundary of the layers, since the beam is normally incident on the sample. A two-layer magnetoactive superlattice is characterized [10] by uniaxial complex dielectric ε ij and induced optical activity G ij tensors. The corresponding principal values of these effective tensors are given by

show abstract

Radially polarized Bessel-Gauss beams: decentered Gaussian beam analysis and experimental verification

Cited by 21 publications

References 27 publications

Unveiling the Propagation Dynamics of Self-Accelerating Vector Beams

Unveiling the Propagation Dynamics of Self-Accelerating Vector Beams

Electron acceleration in a homogeneous plasma by Bessel‐Gaussian and Gaussian pulses

Photodeflection Spectroscopy of Magnetoactive Superlattices Irradiated by Bessel–Gaussian Light Beams*

Contact Info

Product

Resources

About