Results 241 to 250 of about 1,176,513 (293)

Improved Gaussian beam-scattering algorithm [PDF]

Applied Optics, 1995
The localized model of the beam-shape coefficients for Gaussian beam-scattering theory by a spherical particle provides a great simplification in the numerical implementation of the theory.
James Lock
exaly   +2 more sources

Some of the next articles are maybe not open access.

Related searches:

Gaussian beams and their generalizations

Physical Review A, 1985
Boundary-value problems for the reduced wave equation that give rise to Gaussian and generalized Gaussian beams in paraxial regions are studied via complex ray geometrical optics. Expressions for the field valid both within and outside the paraxial region are obtained, and the results are compared with those given by paraxial wave optics and evanescent-
openaire   +2 more sources

Nonparaxial Gaussian beams

Applied Optics, 1990
When the waist size of a Gaussian beam becomes of the order of the wavelength of light, the beam does not satisfy the paraxial condition in which it is derived. In this paper, we define the lower bound to the waist size by showing that a Gaussian beam whose waist size is larger than this bound safely satisfies the paraxial condition.
openaire   +2 more sources

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

Journal of Modern Optics, 2001
Abstract A further comparison between flattened Gaussian beams (FGBs) and super-Gaussian beams (SGBs) is performed. It is shown that the two FGB and SGB having the same beam propagation factor (M2−factor) but different waist widths demonstrate a similar irradiance profile at the position of the equal generalized Fresnel number, while they propagate ...
Baida Lü, Shirong Luo, Xiaoling Ji
openaire   +1 more source

Symmetric Pearcey Gaussian beams

Optics Letters, 2021
In this Letter, a new, to the best of our knowledge, type of autofocusing and symmetric beam arisen from two quartic spectral phases is introduced in theory and experiment. The symmetric Pearcey Gaussian beam (SPGB), formed with a Gaussian term and two multiplying Pearcey integrals, processes a focusing intensity approximately 1.32 times stronger than ...
You Wu, Jiajia Zhao, Zejia Lin, Haiqi Huang, Chuangjie Xu, Yujun Liu, Kaihui Chen, Xinming Fu, Huixin Qiu, Hongzhan Liu, Guanghui Wang, Xiangbo Yang, Dongmei Deng, Lingling Shui   +13 more
openaire   +2 more sources

Beam propagation factor of decentred Gaussian and cosine-Gaussian beams

Journal of Modern Optics, 2000
Abstract On the basis of the second moment method, the beam propagation factor (M 2−factor) of decentred Gaussian beam has been derived, and analysed physically. Then, the result is extended to novel sinusoidal-Gaussian beams, one type of which is the cosine—Gaussian beam, which can be regarded as a superposition of two decentred Gaussian beams.
Baida Lü, Hong Ma
openaire   +2 more sources

Transformation of Hermite-Gaussian beams into complex Hermite-Gaussian and Laguerre-Gaussian beams

SPIE Proceedings, 1999
Hermite-Gaussian, Laguerre-Gaussian and complex Hermite- Gaussian modes are solutions of the paraxial wave equation. Using an astigmatic optical system each type of beams can be transformed into the others. This allows a generation of complex Hermite-Gaussian modes with twist whose propagation behavior is investigated in detail.
Holger Laabs, Chunqing Gao, Horst Weber, Nicolas Kugler, Chang Ming Zhao   +4 more
openaire   +1 more source

Diffraction and focusing of Gaussian beams

Applied Optics, 1985
Methods for the measurement of the waist size and position for Gaussian beams are summarized. An alternative method is given which would apply to pulsed systems. The general theory of diffraction of Gaussian beams is developed which provides a new method for the location of the beam waist.
R M, Herman, J, Pardo, T A, Wiggins
openaire   +2 more sources

Decentered Gaussian beams and production of novel sinusoidal Gaussian beams

SPIE Proceedings, 1999
The beam propagation factor(M2-factor) of the one-dimensional(1D) decentered Gaussian beam(DGB) has been derivedbased on the second moment method. It has been then shown that the results can be extended to some novel beams, such asthe sinh-Gaussian beam(ShGB) and sine-Gaussian beam(SiGB) etc., which can be regarded as a superposition of twoDGBs ...
Baida Lu, Hong Ma
openaire   +1 more source

Helical Ince–Gaussian laser beams as superpositions of Hermite–Gaussian beams

Journal of the Optical Society of America A
In this work, we theoretically and numerically analyze helical Ince–Gaussian (hIG) modes, hIGp,q(x,y,ε). We derive explicit analytical relationships to describe the ε-dependence (where ε is the ellipticity parameter) of the orbital angular momentum (OAM) of hIGp,q(x,y,ε) modes at p=2,3,4,5. The derivation procedure relies on expansions of the hIG modes
Eugeny G. Abramochkin, Victor V. Kotlyar, Alexey A. Kovalev   +2 more
openaire   +2 more sources