Beamshaper

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How to design a Gaussian to top hatbeamshaper

2023911 — The eyepiece is usually located at the top of the microscope, and its role is to further enlarge the image after the objective lens is enlarged, ...

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Flat-topbeam

Apr 2, 2024 — Depth of Field – a balancing act. Most who are involved with imaging have at least some understanding of depth of field (DoF). DoF is the ...

Laserbeamhomogenizer

State-of-the-art lasers produce a focus that resembles either a bell (Gaussian) curve or a rectangular (top-hat) shape and therefore the resulting heat profile is predefined. Beam-shaping is a technique for influencing the shape of the focus and therefore forming the heat profile in a desired manner. This offers the possibility to mitigate defects and increase the processing window as well as the production efficiency.

A 'good' Abbe number varies depending on the specific application and the visual requirements of the user. For eyeglass lenses, materials with an Abbe number of 30 or higher are generally considered to have acceptable levels of chromatic aberration for most users. However, for applications requiring extremely high optical precision, materials with even higher Abbe numbers may be necessary.

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The Abbe number, also known as V-number or constringence, is a critical parameter in optical engineering that quantifies the dispersion of an optical material. Dispersion refers to the degree to which a material separates light into its component colors as it passes through. A higher Abbe number indicates lower dispersion and, consequently, less chromatic aberration in the lens.

Pi shaper

by RJ Tancin · 2021 · Cited by 28 — This manuscript presents an ultrafast-laser-absorption-spectroscopy (ULAS) diagnostic capable of providing calibration-free, single-shot measurements of ...

Laguerre Gaussbeam

Ongoing research includes the direct manufacturing of beam-shaping elements in bulk glass, which would offer more degrees of freedom compared to a relief. Beyond additive manufacturing, beam shaping also plays an increasing role in other directions of research, for example as a tool in optical metrology.

Beamexpander

Beam-shaping also offers the possibility of processing large areas at once, for example engraving product information without having to move the laser beam. For designing elements for large-area processing, the main challenge is the presence of speckle, which are artefacts due to undesired interference of light. LPT develops setups and algorithms to reduce the influence of speckle during processing. For testing new developments, low average power pulsed lasers are employed which allow using liquid crystal spatial light modulators instead of static diffractive optical elements. These modulators work similar to LCD screens and allow quickly displaying different structures without having to manufacture a new glass element each time. By using two sequential modulators, researchers from LPT showed speckle-free large-area beam-shaping.

The Abbe number is particularly important in the design of lenses for eyeglasses, cameras, and telescopes, where minimizing chromatic aberration is crucial for clear vision and high-quality images. Materials with a high Abbe number are preferred for applications requiring precise optical performance.

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We are developing methods for the processing of diamond and various applications ranging from quantum optics to biological sensing. In particular, adaptive ...

Jul 20, 2024 — Blue diode lasers at 445 nm can be used for high-resolution engraving for many materials like opaque acrylic, wood, plastics, fabrics, leather, ...

In conclusion, the Abbe number is a fundamental parameter in the selection of optical materials, guiding the balance between material properties and the optical performance required for specific applications. While higher Abbe numbers are generally indicative of superior optical quality, the choice of material must also consider other factors such as weight, durability, and cost.

Gaussianbeam

To shape laser beams, so-called diffractive optical elements can be used, which are glass slides with a surface relief of a few micrometers. By introducing a phase delay, they influence the propagation of light. The Institute of Photonic Technologies (LPT) works on predicting optimized beam shapes for specific applications, calculating the appropriate relief, and showing advantages in materials processing. As an example, this technique was successfully used at LPT for welding a crack-prone aluminum-copper alloy, which resulted in a weld seam quality close to a polished surface and an enlarged processing window.

The laser is a universal tool in materials processing. Focusing a high-power laser to a single spot allows various applications like welding and laser-based additive manufacturing. Heating and consequent melting of the material mainly drives these processes in which the laser beam acts as a heat source. For the processing result, resolidification is critical as defects like cracks can occur but also spatter might be produced during laser interaction due to overheating and turbulences in the melt pool. An important factor for these defects is the heat distribution in the work piece.