@ingo_steiner , can you please explain to the forum in what sense is ‘luminous algo’ considered to be ‘Open software’ as is stated in the title of this thread?

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No need to delete your post, it is fine to post about commercial software as long as this is indicated. Just put “Commercial Posting” or something similar at the top.

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Due to the machine kinematics with 5+3 axes, special demands are placed on the CAM-NC data chain. Fraunhofer ILT develops solutions that enable the user to use a well-known CAM system for milling, but also for path planning in laser polishing. A downstream technology processor, which combines the functions of a post-processor with specific adjustments, converts the milling paths into laser polishing paths. The 3D laser scanner is controlled by a flexible software system that can be seamlessly integrated into the NC control of the machine. The machine and the CAM-NC data chain are available for component- and application-specific test series at Fraunhofer ILT.

On diamond-milled surfaces with an initial roughness of Ra ≈ 0.3 μm, a roughness of Ra ≤ 0.1 μm can be achieved when polished with pulsed laser radiation. The processing time is only 3 s/cm² and, thus, significantly shorter than that of manual polishing.

good tips, thanks! in looking into pyrate (which looks promising) I came across this paper which might also be of interest @hgibbs: sciencedirect.com Open-source optimization algorithms for optical design Driven by the growth of internet, commercial cloud computing now provides on-demand, massively parallel computational power. This cloud processing can…

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Burrs and edges can be removed by laser machining and remelted as a function of the requirements. In this case, when a defined shape is melted, for example, uniform rounding can be achieved.

I’ve only used Zemax before, but unfortunately have no license at the moment. Is there anyone out there with a positive experience learning/using an open source tool?

@ingo_steiner Also, if this is a commercial posting, please mark it as such. See for example the posts from 3DOptix. Thank you.

Laser polishing is particularly well suited for nickel, titanium and cobalt/chromium alloys. Even with an initial roughness in the range Ra = 1 to 15 μm, a roughness of Ra < 0.2 μm can be achieved with an area rate of 1 to 5 cm²/min. Other steels and cast alloys can also be polished. The polishing result depends on the material and its homogeneity.

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3Doptix revolutionary cloud-based ray optics simulation platform runs on the user’s browser and allows the implementation of versatile optical designs. The simulation platform has a build-in, off-the-shelf optomechanical component, and common light sources library, as well as a growing optical elements database from leading vendors. You can also use the 3DOptix optomechanics to design a 3D setup or to build a design with a minimum alignment process - an out of the box working setup.

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it really depends what you need to do: Zemax is a rather capable and comprehensive software but for basic design and optimization is a bit of overkilling. I have a license for OSLO (Lambda Research): the program is ok but a bit outdated, structure similar to Zemax. There is also an EDU version, limited to 10 surfaces, which you can use for free. Another free alternative is KDP2 http://www.ecalculations.com It is rather capable, but I did not use it for any serious design.

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@hgibbs Could you describe what it is that you want to design if you’re still looking into this two years later? Knowing the use case would better determine what algorithms would be appropriate for the problem. Zemax/CODE V, Oslo, FRED, etc. are really compilations of numerous algorithms for solving different sorts of problems. Open source packages instead tend to focus on more narrow problem domains, such as lens design or beam propagation. For this reason, it’s difficult to recommend something without knowing the problem.

In addition, when the process parameters are modulated, the gloss level on tool surfaces can be adjusted with high local resolution (150 μm), which also makes it possible to produce two-color and multi-gloss effects. In leather grain, for example, only the recesses of the grain are polished in the tool, the webs remain unprocessed.

It depends on how detailed / high level modelling you need. For basic stuff, if you are willing to put in some work in designing the geometry of your optical elements, the free and open source ‘Optics Workbench’ for FreeCAD is quite good I think. Here is the GitHub link: GitHub - chbergmann/OpticsWorkbench I found it very useful for making teaching demos such as shown in my latest YouTube video on beam splitters and the compound microscope here: Beam Splitters and the Advanced Filter Block (plus Microscope Length and Distance RMS/DIN Standards) - YouTube but it is capable of a lot more.

3DOptix has recently launched a FREE, cloud-based (no installation is needed) Optical Design & Simulation software tool.

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When laser radiation is used to polish metals, a thin surface layer of the workpiece is remelted and the surface smoothed due to interfacial tension. The innovation of laser polishing lies in its fundamentally different mode of action (remelting) compared to conventional grinding and polishing processes (ablation). For metallic materials, diode-pumped solid-state lasers are generally used. If the surfaces already have a low roughness, e. g. after grinding, pulsed lasers with pulse durations of several 100 ns can be used. If the surfaces are rougher, e. g. after milling or additive manufacturing, continuous lasers are used. The remelting depth is between a few 100 nm when pulsed lasers are used and up to 100 μm with continuous lasers.

Just giving this thread a bump - curious if anyone has found anything else over the past couple years they really like? I’m interested in packages that have good python APIs - so opticspy and pyrate seem appealing to me. I’m curious if anyone has been using them. Thanks!!

On the tool steels 1.2343, 1.2311, 1.2379 and 1.3207, laser polishing can be used to smooth milled and eroded surfaces with a roughness of Ra = 1 to 4 μm down to a roughness of Ra = 0.05 to 0.2 μm. The surface rate here is about 1 cm²/min, but can be increased to up to 10 cm²/min by material-adapted intensity distributions. Injection molding and embossing tools with laser-polished surfaces have comparable service lives to those of manually polished tools.

I’d also like to add Geopter here as it comes the closest to Zemax of all the OS design tools that I’ve found and isn’t too well known:

Driven by the growth of internet, commercial cloud computing now provides on-demand, massively parallel computational power. This cloud processing can…

Changing the Field of View (FOV): The Field of View (FOV) determines how much of the scene is visible through the camera. To adjust the FOV, select the camera ...

I understand you have made it clear that this is ‘on the market’ but are you claiming this commercial product is also ‘open source’ or ‘source available’ software (as some other commercial software is)?

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OpticsStudio (née zemax) is the best I have used, but it is definitely expensive to keep! Every so often I search for another open-source or cheaper solution, but none have been up to snuff.

For the processes used in tool and mold making, the state of the art is manual polishing, which has processing times of often more than 10 min/cm². Therefore, there is a great need, particularly in this industry, for automated polishing processes for complex 3D surfaces. The roughness it requires is often in the range of Ra = 0.05 to 0.3 μm.

there is also Optalix ( http://www.optenso.com/ ) which offers a low-cost entry-level version. Among python packages, there is also Pyrate ( https://github.com/mess42/pyrate ).

The Fraunhofer Institute for Laser Technology ILT uses laser radiation to automatically polish components with complex 3D surfaces. With this new process, users from various industries, such as those from tool and mold industry or medical technology, can avoid tedious manual p rocessing and save both money and time.

Since 1998, we are supplying a variety of ophthalmic lenses, equipment, frames and instruments at reasonable prices. Our exclusive line of products is ...

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Qioptiq has a free (but closed source) option here - https://www.qioptiq-shop.com/en/Optics-Software/Winlens-Optical-Design-Software/Free-Winlens-Basic/?cur=3

lately, I have been keeping my eye on opticspy. It looks promising! It uses the refractive index database as its glass catalog.

Titanium materials are often used in medical technology. While these can be polished with conventional, cutting processes, there is a great expenditure of time and personnel. When this process is automated using laser polishing, machining time and cost can be significantly reduced. Laser-polished surfaces have a high degree of geometrical accuracy owing the principle involved and, therefore, allow tight tolerances. The absence of grinding and polishing agents also means that the surfaces have a high chemical purity after laser polishing, which is particularly important for implants.

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Together with partners from the industry, Fraunhofer ILT has developed a machine tool for laser polishing of complex 3D components. The laboratory results and experience have been transferred to a robust machine technology suitable for industrial production. The basis is a five-axis portal machine, which positions the workpieces and performs slow feed movements. In combination with a highly dynamic three-axis laser scanner, the machine can reach the required process speeds of up to 1 m/s.

This Python package is worth a look: RayTracing. I have used it for optical system design and found it to be reasonably intuitive and easy to use.