Focusing properties and focal depth of amplitude modulation Gaussian beams

Based on the vectorial Debye theory, the tight focusing properties of partially coherent, radially polarized vortex beams are investigated in detail. In this paper, we propose to use an amplitude modulated filter in combination with a high NA lens to generate long focal depth in the focal region. Numerical results show that the generation of long focal depth of FWHM (22.08λ) is achieved, which finds useful application in microscopy techniques such as particle acceleration, laser processing, optical micromanipulation, and beam shaping.

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Effect of dielectric interface on the tight focusing properties of radially polarized annular multi Gaussian beams

Optical and Quantum Electronics ◽

10.1007/s11082-014-9934-y ◽

2014 ◽

Vol 47 (3) ◽

pp. 587-593 ◽

Cited By ~ 1

Author(s):

M. Lavanya ◽

K. Prabakaran ◽

K. B. Rajesh ◽

M. Udhayakumar

Keyword(s):

Gaussian Beams ◽

Dielectric Interface ◽

Tight Focusing ◽

Radially Polarized ◽

Focusing Properties

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Phase retrieval of Laguerre-Gaussian beams through atmospheric turbulence by binary amplitude modulation

Laser Communication and Propagation through the Atmosphere and Oceans VIII ◽

10.1117/12.2528556 ◽

2019 ◽

Author(s):

Eduardo Peters ◽

Gustavo L. Funes ◽

Jaime A. Anguita

Keyword(s):

Atmospheric Turbulence ◽

Amplitude Modulation ◽

Phase Retrieval ◽

Gaussian Beams

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Bessel beams: a potential strategy for laser-induced breakdown spectroscopy

Journal of Analytical Atomic Spectrometry ◽

10.1039/d1ja00270h ◽

2021 ◽

Author(s):

Jiaxin Lv ◽

Chenwei Zhu ◽

Zhiyang Tang ◽

Qingzhou Li ◽

Kun Liu ◽

...

Keyword(s):

Focal Depth ◽

Laser Induced Breakdown Spectroscopy ◽

Gaussian Beams ◽

Uneven Surface ◽

Bessel Beams ◽

Breakdown Spectroscopy ◽

Surface Samples ◽

Laser Induced Breakdown ◽

Potential Strategy ◽

Accuracy And Stability

LIBS with Bessel beams has a longer focal depth and has higher accuracy and stability in the analysis of uneven surface samples than traditional Gaussian beams.

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Achievement of longitudinally polarized focusing with long focal depth by amplitude modulation

Optics Letters ◽

10.1364/ol.36.001185 ◽

2011 ◽

Vol 36 (7) ◽

pp. 1185 ◽

Cited By ~ 60

Author(s):

Jie Lin ◽

Ke Yin ◽

Yuda Li ◽

Jiubin Tan

Keyword(s):

Amplitude Modulation ◽

Focal Depth

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Simultaneous Trapping of Two Types of Particles with Focused Elegant Third-Order Hermite–Gaussian Beams

Micromachines ◽

10.3390/mi12070769 ◽

2021 ◽

Vol 12 (7) ◽

pp. 769

Author(s):

Jingjing Su ◽

Nan Li ◽

Jiapeng Mou ◽

Yishi Liu ◽

Xingfan Chen ◽

...

Keyword(s):

Focal Plane ◽

Rayleigh Scattering ◽

Surrounding Medium ◽

Beam Waist ◽

Spherical Particles ◽

Gaussian Beams ◽

Third Order ◽

Radiation Forces ◽

Dielectric Spheres ◽

Focusing Properties

The focusing properties of elegant third-order Hermite–Gaussian beams (TH3GBs) and the radiation forces exerted on dielectric spherical particles produced by such beams in the Rayleigh scattering regime have been theoretically studied. Numerical results indicate that the elegant TH3GBs can be used to simultaneously trap and manipulate nanosized dielectric spheres with refractive indexes lower than the surrounding medium at the focus and those with refractive indexes larger than the surrounding medium in the focal vicinity. Furthermore, by changing the radius of the beam waist, the transverse trapping range and stiffness at the focal plane can be changed.

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FOCUSING BEHAVIOR OF GAUSSIAN BEAM THROUGH A VARIABLE π-PHASE PLATE PLUS LENS WITH LONG FOCAL DEPTH

Modern Physics Letters B ◽

10.1142/s0217984908014614 ◽

2008 ◽

Vol 22 (03) ◽

pp. 155-165

Author(s):

JUAN LIU ◽

XIAO-DONG SUN ◽

BEN-YUAN GU ◽

SHANG-QI WANG ◽

SI DI ◽

...

Keyword(s):

Gaussian Beam ◽

Optical Tweezers ◽

Focal Depth ◽

Longitudinal Direction ◽

Spot Size ◽

Propagation Direction ◽

Gaussian Beams ◽

Phase Plate ◽

Hollow Beam ◽

Phase Functions

We investigate the optical properties of Gaussian beams diffracted by a variable π-phase plate clinging tightly to the lens with long focal depth and its dependence on the size of the π-phase plate and the preset long focal depth of the lens. The numerical results show that the π-phase plate with appropriate size plus the multifunctional lens illuminated by Gaussian beam can produce bi-focus along the propagation direction and a center hollow light, and the distance between two focal planes along the longitudinal direction and the transverse and longitudinal spot size of the hollow beam will vary when changing the size of the π-phase plate or the preset long focal depth. This investigation indicates that the distance between the focal planes and the spot sizes of the hollow light can be controlled by the appropriately chosen size of the π-phase plate and the preset long focal depth of the lens. Furthermore, we compare the optical characteristics produced by three existing phase functions of the lens with long focal depth. It is expected that this investigation will provide useful information in various optical tweezers for operating and controlling.

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