Gaussian laser beam profile shaping

Dickey, Fred M.

doi:10.1117/1.601069

Cited by 87 publications

(41 citation statements)

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“…1. The shaded portion shows the effect of passing a Gaussian beam through an aperture smaller than the diameter of the beam [6,7]. The diameter of a Gaussian beam is defined as the distance across the center of the beam for which the irradiance equals 1/e 2 of the maximum irradiance (1/e 2 =0.135).…”

Section: Transverse Electromagnetic Modesmentioning

confidence: 99%

Laser Beam Analysis Using Image Processing

Alsultanny¹

2006

J. of Computer Science

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Abstract:The laser beam profiles captured by CCD camera processed and analyzed by using 2D-graphic and displayed on the monitor. The analysis of the He-Ne profiles and laser diode profiles are presented. The results showed that the He-Ne laser emits a pure Gaussian beam, whereas the diode laser emits an elliptical beam shape. The laser beam profile analysis developed to study the intensity distribution, the laser power, number of modes and the laser beam, these parameters are quite important in many applications such as the medical, industrial and military. The analysis of the image profile can be used in determination the distance of the objects depending on the distribution of the spot contours of the laser beam with its width. As well as it can be used to capturing images to the objects and determining their distance and the shape of the objects.

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Section: Transverse Electromagnetic Modesmentioning

confidence: 99%

Laser Beam Analysis Using Image Processing

Alsultanny¹

2006

J. of Computer Science

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“…9 of Ref. 10. With the same lateral shifts, the design with the added-phase-control approach is able to maintain the profiles much better.…”

Section: More Tolerance To the Lateral Shift Of The Input Laser Beammentioning

confidence: 76%

“…11 of Ref. 10, positive defocusing gives a smaller pattern size, increased average irradiance, and raised-up edges, while negative defocusing produces a larger pattern size and decreased average irradiance. Compared with Fig.…”

Section: Larger Depth Of Focusmentioning

confidence: 99%

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Enhanced performance of refractive laser beam shapers through additional phase control at focus

Meuret

Vervaeke

et al. 2016

Opt. Eng

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Abstract. Laser beam shaping at focus or focal beam shaping is essential for many applications. The most common approach makes use of the Fourier transforming properties of lenses to generate at their focal planes the desired irradiance patterns, e.g., the flattop. There are two inherent limitations for this approach. First, the shaping quality depends strongly on the dimensionless parameter β. In the case of a long focal length or small beam sizes giving a small β value, additional beam expanders are needed to achieve a satisfying irradiance pattern at the focus. Second, without considering the phase, the irradiance patterns beyond the focal plane are not controlled. We propose a different approach with two plano-aspheric lenses that allow control of both irradiance and phase at focus. The design method comprises an extended ray mapping procedure combined with backward wave propagation from focus. With this design approach, the shaping quality is guaranteed without the possible need for extra beam expanders, offering the potential for a more compact system with fewer elements. Through the additional phase control, the depth of focus is enlarged to a large extent and the designed system becomes more tolerant.

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“…The analysis leading to this parameter, and its effects, have been extensively discussed. 1,9,10 Finally, iterative methods using physical optics principles are being studied to perform beam transformations into complex geometries. 11,12 An example would be the transformation of a Gaussian input beam into the number "2".…”

Section: Discussionmentioning

confidence: 99%

<title>Laser beam shaping via conventional design software</title>

Holswade¹,

Dickey²

2001

SPIE Proceedings

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Previous efforts have shown that optimization-based techniques, particularly genetic algorithms, can be used to effectively design beam shaping systems for several classes of problems. These techniques have used external programs to perform the optimization, which allow a great deal of optimization flexibility. However, the external program must be understood and tuned for beam shaping applications. For many problems, the flexibility of an external program is not required. This work shows that the internal optimization routines in a typical lens design program can perform effective optimization of several classes of beam shaping systems. In addition, previous beam shaping merit functions have used a large number of rays, typically 200, to perform the optimization. Several pieces of data must be recorded for each ray. This results in a fairly lengthy merit function evaluation by the lens design program. This work shows that by setting up certain problems using upfront geometrical considerations, reasonable optimizations can be obtained with as few as 20-40 rays being traced. Example problems are presented, including the merit functions used. Guidance is provided for the designer interested in picking appropriate parameters and optimization routines for some typical problems.

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Gaussian laser beam profile shaping

Cited by 87 publications

References 0 publications

Laser Beam Analysis Using Image Processing

Laser Beam Analysis Using Image Processing

Enhanced performance of refractive laser beam shapers through additional phase control at focus

<title>Laser beam shaping via conventional design software</title>

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