Two-dimensional focusing of laser beams to provide uniform irradiation

Lü, Baida; Jian-zhou, Zheng; Cai, Bin; Zhang, Bin

doi:10.1016/s0030-4018(97)00499-9

Cited by 5 publications

(2 citation statements)

References 9 publications

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“…And a number of beam-smoothing technologies have been proposed [1][2][3][4][5][6][7][8][9][10] to reduce the modulation of beam intensity in high-power laser systems. The array optical system is one kind of the most important techniques, the typical examples of these system include lens array (LA) 3 , the orthogonal cylindrical lens arrays (OCLA) 5 , crossed segmented wedge arrays (CSWA) 6 . The OCLA can achieve obvious improvement of irradiation uniformity on the target, which is insensitive to non-uniformity of the incident laser beam; furthermore, it could not be influenced by the lasers near field distribution.…”

Section: Introductionmentioning

confidence: 99%

Improved uniformity of target irradiation by combining an orthogonal cylindrical lens array and the polarization control

Jian-zhou

Zheng²,

et al. 2010

5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes

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A scheme of combining technology of orthogonal cylindrical lens array (OCLA) and polarization control plate (PCP) is introduced to improve target irradiation uniformity in laser fusion. The feasibility of the scheme is also analyzed by detailed two-dimensional simulation. It shows that a focal pattern with flat-top and sharp-edge profile could be obtained with an OCLA, while interference stripes inside the pattern are smoothed out by the use of the polarization control plate (PCP) technique. Moving the target slightly from the exact focal plane of the principal focusing lens can eliminate middle-scale-length intensity fluctuation further. And a well-irradiated laser spot with small nonuniformity and great energy efficiency can be obtained in this scheme.

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Section: Introductionmentioning

confidence: 99%

Improved uniformity of target irradiation by combining an orthogonal cylindrical lens array and the polarization control

Jian-zhou

Zheng²,

et al. 2010

5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes

Self Cite

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show abstract

“…Up to now, a number of the technologies and approaches for the uniform irradiation have been developed [1][2][3][4][5][6][7][8] , the array optical system is one kind of the most important techniques. The orthogonal cylindrical lens arrays (OCLA) can achieve obvious improvement of irradiation uniformity on the target, which is insensitive to non-uniformity of the incident laser beam, furthermore, it could not be influenced by the laser's near field distribution 5 .…”

Section: Introductionmentioning

confidence: 99%

Improved two-dimensional orthogonal cylindrical lens arrays optical system with controllable focus profile for uniform irradiation

Jian-zhou

Dong

et al. 2009

4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technolo

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A novel orthogonal cylindrical lens arrays (OCLA) system has been proposed to obtain two-dimensional (2D) uniform irradiation with controllable focus width and transformation of beam-shape at the same time. The system is composed of two pairs of mutual OCLA and aspheric lens. Based on adaxial matrix optics and scalar quantity diffraction integral theory, the principle of this system with controllable focus profile is analyzed and optimum design of system parameter are presented in detail respectively. The simulated results show that by a suitable choice of system parameters two-dimensional uniform focusing of laser beams with controllable focus width from several hundred microns to several millimeters can be achieved. And the system converts a circular laser beam into a flat-top square focal spot of steeper edges without side lobes. In order to confirm our theoretical considerations, with Zemax optical design software, confirm regular focus width with the variation of the distance between two groups of mutual OCLA, the shape and intensity distribution of focal spot is confirmed in agreement quite well with theory.

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A Double Gaussian Beam Method for the Determination of Particle Size, Direction and Velocity

Castagner

Jones

2004

Part & Part Syst Charact

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This paper describes a technique aimed at measuring particle size by light scattering from gaussian laser beams. The uncertainties in illumination due to the beam shape are avoided by determination of the direction and velocity. The method, which we arbitrarily called the Two Beam System (TBS), uses a simple birefringent prism to separate the incident laser beam into two orthogonally polarised overlapping parallel beams. The relative delay and amplitudes of the intensities scattered out of the orthogonal polarisations are indicative of the particle direction and velocity. Having obtained the direction of travel of the particle, its size is then obtained from the scattered intensity using Mie theory.

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Two-dimensional focusing of laser beams to provide uniform irradiation

Cited by 5 publications

References 9 publications

Improved uniformity of target irradiation by combining an orthogonal cylindrical lens array and the polarization control

Improved uniformity of target irradiation by combining an orthogonal cylindrical lens array and the polarization control

Improved two-dimensional orthogonal cylindrical lens arrays optical system with controllable focus profile for uniform irradiation

A Double Gaussian Beam Method for the Determination of Particle Size, Direction and Velocity

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