Numerical simulation of a Gaussian beam profile passing through a Kerr medium

2009 ◽  
Vol 9 (6) ◽  
pp. 1347-1350 ◽  
Author(s):  
E. Koushki ◽  
S.H. Mousavi ◽  
M.H. Majles Ara ◽  
A. Koushki
Keyword(s):  
Numerical Simulation ◽  
Gaussian Beam ◽  
Beam Profile ◽  
Kerr Medium

Propagation of Airy–Gaussian beam in Kerr medium

2015 ◽  
Vol 17 (3) ◽  
pp. 035504 ◽  
Author(s):  
Chidao Chen ◽  
Bo Chen ◽  
Xi Peng ◽  
Dongmei Deng
Keyword(s):  
Gaussian Beam ◽  
Kerr Medium

Experimental demonstration of novel effects on the far-field diffraction patterns of a Gaussian beam in a Kerr medium

2006 ◽  
Vol 8 (11) ◽  
pp. 947-951 ◽  
Author(s):  
Cesar M Nascimento ◽  
Márcio A R C Alencar ◽  
Sabino Chávez-Cerda ◽  
Monique G A da Silva ◽  
Mario R Meneghetti ◽  
...  
Keyword(s):  
Gaussian Beam ◽  
Kerr Medium ◽  
Far Field ◽  
Experimental Demonstration ◽  
Diffraction Patterns

Shallow Hidden Cave Seismic Wavefield Numerical Simulation Based on Gaussian Beam Method

2013 ◽  
Vol 353-356 ◽  
pp. 1871-1874
Author(s):  
Guo Hua Liu ◽  
Mei Xiao
Keyword(s):  
Numerical Simulation ◽  
Gaussian Beam ◽  
High Efficiency ◽  
Simulation Method ◽  
Field Work ◽  
Forward Modeling ◽  
Seismic Prospecting ◽  
Beam Method ◽  
Gaussian Beam Method ◽  
Seismic Wavefield

Hidden cave is one of the most common geological hazards and the seismic prospecting method is an efficient tool to detect it. Numerical simulation method is the main method of geophysical forward modeling and plays a very important role in seismic prospecting. Gaussian beam forward modeling method combines the wave equation and the ray theory closely, and it has the advantages of high efficiency and high precision. We used Gaussian beam method to simulate the seismic wavefield of shallow hidden cave, and the results showed that the seismic numerical simulation can effectively help us design and optimize the geometry in actual field work. With the help of seismic numerical simulation, the efficiency and precision of shallow seismic prospecting will be improved significantly.

Effect of laser beam truncation (pinhole), (ordered) dithering, and jitter on residual smoothness after poly(methyl methacrylate) ablations, using a close-to-Gaussian beam profile

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Shwetabh Verma ◽  
Juergen Hesser ◽  
Samuel Arba-Mosquera
Keyword(s):  
Laser Beam ◽  
Methyl Methacrylate ◽  
Gaussian Beam ◽  
Low Cost ◽  
Random Noise ◽  
Beam Profile ◽  
Negatively Associated ◽  
Poly Methyl Methacrylate ◽  
The Impact ◽  
Ordered Dithering

Abstract Smoother surfaces after laser vision correction have been widely accepted as a factor for improving visual recovery regardless of the used technique (PRK, LASIK, or even SMILE). We tested the impact of laser beam truncation, dithering (expressing a continuous profile on a basis of lower resolution causing pixels to round up/down the number of pulses to be placed), and jitter (a controlled random noise (up to ±20 µm in either direction) added to the theoretical scanner positions) on residual smoothness after Poly(methyl methacrylate) (PMMA) ablations, using a close-to-Gaussian beam profile. A modified SCHWIND AMARIS system has been used providing a beam profile with the following characteristics: close-to-Gaussian beam profile with full width at half maximum (FWHM) of 540 µm, 1050 Hz. Laser parameters have been optimized following Invest. Ophthalmol. Vis. Sci., vol. 58, no. 4, pp. 2021–2037, 2017, the pulse energy has been optimized following Biomed. Opt. Express vol. 4, pp. 1422–1433, 2013. For the PMMA ablations, two configurations (with a 0.7 mm pinhole and 0.75 mJ and without pinhole and 0.9 mJ (for fluences of 329 mJ/cm2 and 317 mJ/cm2 and corneal spot volumes of 174 and 188 pl)) were considered, along with two types of lattices (with and without ordered dithering to select the optimum pulse positions), and two types of spot placement (with and without jitter). Real ablations on PMMA (ranging from −12D to +6D with and without astigmatism of up to 3D) completed the study setup. The effect of the 2 × 2 × 2 different configurations was analyzed based on the roughness in ablation estimated from the root mean square error in ablation. Truncation of the beam is negatively associated to a higher level of residual roughness; ordered dithering to select the optimum pulse positions is positively associated to a lower level of residual roughness; jitter is negatively associated to a higher level of residual roughness. The effect of dithering was the largest, followed by truncation, and jitter had the lowest impact on results. So that: Dithering approaches help to further minimize residual roughness after ablation; minimum (or no) truncation of the beam is essential to minimize residual roughness after ablation; and jitter shall be avoided to minimize residual roughness after ablation. The proposed model can be used for optimization of laser systems used for ablation processes at relatively low cost and would directly improve the quality of results. Minimum (or no) truncation of the beam is essential to minimize residual roughness after ablation. Ordered dithering without jitter helps to further minimize residual roughness after ablation. Other more complex dithering approaches may further contribute to minimize residual roughness after ablation.

Dynamic Multimode Analysis of High-Power Lasers with Super-Gaussian Beam Profile using Precombined Gaussian Modes

2010 ◽  
Author(s):  
Matthias Wohlmuth ◽  
Konrad Altmann ◽  
Michaël Hemmer ◽  
Mario Goehre ◽  
Christoph Pflaum ◽  
...  
Keyword(s):  
Gaussian Beam ◽  
High Power ◽  
Beam Profile ◽  
High Power Lasers

Increasing transverse stability of optical tweezers by using dual-Gaussian beam profile

2000 ◽  
Vol 9 (1) ◽  
pp. 65-68 ◽  
Author(s):  
Yao Xin-cheng ◽  
Li Zhao-lin ◽  
Cheng Bing-ying ◽  
Han Xue-hai ◽  
Zhang Dao-zhong
Keyword(s):  
Gaussian Beam ◽  
Optical Tweezers ◽  
Beam Profile ◽  
Transverse Stability

OPTICAL SPATIAL SOLITON IN STRONG NONLOCAL LOGARITHMIC MEDIUM

2013 ◽  
Vol 22 (03) ◽  
pp. 1350026
Author(s):  
QING WANG ◽  
JINGZHEN LI ◽  
XINGHUA WANG
Keyword(s):  
Gaussian Beam ◽  
Evolution Equations ◽  
Beam Width ◽  
Optical Soliton ◽  
Spatial Soliton ◽  
Kerr Medium ◽  
Initial Condition ◽  
Initial Beam ◽  
Spatial Optical Soliton ◽  
The Difference

In this paper, the propagation of Gaussian beam in strong nonlocal logarithmic medium is studied, and the evolution equations for the parameters are obtained. The initial condition of forming spatial optical soliton in this kind of medium, which requires the initial beam on-waist incident and its width equaling to the critical beam width, is different from that in strong nonlocal Kerr medium. The reason of the difference is also analyzed. Moreover, the result shows that the beam width will oscillate periodically when the initial condition is dissatisfied. In addition, we discuss the influence of the initial beam width on oscillating range.

Propagation of a cos-Gaussian beam in a Kerr medium

2011 ◽  
Vol 43 (3) ◽  
pp. 483-487 ◽  
Author(s):  
Ruipin Chen ◽  
Yongzhou Ni ◽  
XiuXiang Chu
Keyword(s):  
Gaussian Beam ◽  
Kerr Medium
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