- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Over compensation algorithm for laser beam shaping using a deformable freeform mirror
摘要： We propose an over compensation (OC) algorithm for laser beam shaping using deformable mirrors. In this algorithm, we model the beam shaping problem using a sequence of standard Monge-Ampère (MA) equations and iteratively applies over compensation to the deviated focal-plane irradiance distributions. Simulations show that this algorithm can get its minimum relative root mean square deviations (RRMSDs) using only a few iterations and actuator perturbations.
关键词： Freeform optics,Active or adaptive optics,Laser beam shaping
更新于2025-09-19 17:13:59
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Generating autofocused aberration laser beams with different spectral performance
摘要： We present a flexible approach for generating autofocused aberration laser beams (ALBs) of different wavelengths based on the diffractive optical element (DOE) design with distinct phase transmittance that has radial power q and periodic angular dependence sin(mφ). The diffraction pattern of ALBs strongly depends on the periodic angular power controlled phase of the DOE. During free-space propagation, the ALBs with different wavelengths convert into different light distributions that have mth-order symmetry (for odd m) and 2mth-order symmetry (for even m). The ALBs exhibit autofocusing properties that significantly differ at longer wavelengths relatively with smaller wavelengths. The formation of light intensity distributions in free-space propagation has a sharp focusing feature that strongly depends on the radial power q. The numerically simulated results are presented for wavelengths in the infrared, visible, and ultra-violet regimes. The experimental findings measured at a wavelength of λ = 1064 nm, show good agreement with the numerically simulated results and thus verifying our approach.
关键词： propagation,laser beam shaping,diffractive optics
更新于2025-09-16 10:30:52
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Implementation of a phase plate for the generation of homogeneous focal-spot intensity distributions at the high-energy short-pulse laser facility PHELIX
摘要： We propose and demonstrate the use of random phase plates (RPPs) for high-energy sub-picosecond lasers. Contrarily to previous work related to nanosecond lasers, an RPP poses technical challenges with ultrashort-pulse lasers. Here, we implement the RPP near the beginning of the ampli?er and image-relay it throughout the laser ampli?er. With this, we obtain a uniform intensity distribution in the focus over an area 1600 times the diffraction limit. This method shows no signi?cant drawbacks for the laser and it has been implemented at the PHELIX laser facility where it is now available for users.
关键词： high-power laser,phase plate,short-pulse laser,beam shaping
更新于2025-09-12 10:27:22
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Coherent Ray Tracing Simulation Of Non-Imaging Laser Beam Shaping With Multi-Aperture Elements
摘要： The application of laser light sources for illumination tasks like in mask aligner lithography relies on non-imaging optical systems with multi-aperture elements for beam shaping. When simulating such systems, the traditional approach is to separate the beam-shaping part (incoherent simulation) from dealing with coherence properties of the illuminating laser light source (diffraction theory with statistical treatment). We present an approach using Gaussian beam decomposition to include coherence simulation into ray tracing, combining these two parts, to get a complete picture in one simulation. We discuss source definition for such simulations, and verify our assumptions on a well-known system. We then apply our approach to an imaging beam shaping setup with microoptical multi-aperture elements. We compare the simulation to measurements of a similar beam-shaping setup with a 193 nm continuous-wave laser in a mask-aligner configuration.
关键词： Gaussian beam decomposition,laser beam shaping,mask aligner lithography,coherent ray tracing,multi-aperture elements
更新于2025-09-11 14:15:04
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Computational Modelling of Metasurfaces for Strongly Divergent Beams
摘要： The content of the paper discusses the computational modelling of metasurfaces for strongly divergent beams, focusing on the design and application of metasurfaces with building blocks that can efficiently control light beams with high divergence. It highlights the potential of these metasurfaces in various applications, including optical tweezers, laser beam shaping, and imaging systems. The paper also explores the challenges and limitations in designing such metasurfaces, particularly in achieving high efficiency over a broad range of angles and wavelengths.
关键词： imaging systems,computational modelling,metasurfaces,optical tweezers,divergent beams,laser beam shaping
更新于2025-09-11 14:15:04