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Notchfilter

The coating process was monitored and controlled in each case using the monitoring system MOCCA+® (Modular Optical Coating Control Application), which was also developed at the Fraunhofer IST, including several test-glass changes. The transmission measurements for the calculation of the respective current coating thickness were carried out in the range from 380 to 1650 nm. The fitting range of three filters was therefore outside the measurement range. Nevertheless, the position and shape of the filters could be realized in very good conformity with the design.

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Opticalfilter

In June 2022, the balloon-borne solar observatory “Sunrise III” is scheduled to begin its journey. The aim of the mission is to investigate the magnetic fields and convective plasma flows of the lower solar atmosphere. On board are bandpass filters developed and manufactured at the Fraunhofer Institute for Surface Engineering and Thin Films IST; their task is to restrict the wavelength range on the detectors to the wavelengths which are to be investigated and to block higher orders.

Online in Internet; URL: https://www.ist.fraunhofer.de/en/expertise/optical-systems-applications/optical-filters-small-series/uv-bandpass-filter-sun-observation.html

Source: Fraunhofer-GesellschaftFraunhofer Institute for Surface Engineering and Thin Films IST - UV bandpass filter for sun observation

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UVpassfilterDIY

Through the process development with zirconium oxide tube targets, the possible spectral range for optical coatings was extended in the direction of UV, and precise control of coatings was also realized outside the spectral range measured during coating. This presents new opportunities for the design and deposition of interference filters.

Within the framework of the “Sunrise III” mission, the sun will be studied using a telescope from a flight altitude of around 37 kilometers. The central component is the UV spectropolarimeter (SUSI) built by the Max Planck Institute for Solar System Research. This will be used to study the 300 to 430 nm range, which is not possible from Earth due to disturbance caused by the atmosphere. In addition to high sensitivity in the ultraviolet spectral range, low noise levels are also required.

KolariUV Bandpass

In contrast, the U.S. has failed to embrace this ISO standard, and there are some understandable reasons why. As a rule, the ISO optical standard format leaves a lot to be desired (Figure 1). In some ways, the standard is outdated; i.e., surface figure is still specified relative to a test plate. (Most modern interferometers have software to deal with this, but the ISO method for specifying surface form is based on outdated ideas. In addition to not saving time, old test plates can sometimes contain substantial surface form and radius errors. Those errors are not well accounted for by ISO 10110 and can easily propagate into manufactured parts. An easy work-around this issue is to add a radius tolerance to the Radius of Curvature callout in the drawing. This is generally recommended because radius errors are critical. Customers should not assume that a supplier’s test plates are good.) Other issues include formatting that is restrictive, and prism and cube beamsplitter specifications that are rather awkward. This often deters designing engineers. Also, the surface quality callouts can become very complex. This deters suppliers. Another issue with ISO 10110 is that its surface inspection, much like the dimensioned Scratch/Dig standards, requires the use of a microscope to do it properly. Dedicated software that can quickly calculate the size and dimensions of surface defects then becomes necessary; a fully integrated and dedicated system can be an outstanding tool, but such systems can also be very expensive. Many U.S. shops, due to low demand for the standard, have yet to invest in these types of inspection systems. Without them, inspection per the ISO can be incredibly slow and a major cost driver.

This is ensured by the bandpass filters developed at the Fraunhofer IST. The scientists at the Institute have calculated a layer design for a total of four bandpass filters with central wavelengths between 399 nm and 316 nm and a minimum transmission of 80 percent. Together with the required blocking of up to OD5 in the range from 200 to 1100 nm, more than 200 layers with a total thickness of 21 to 23 µm were required in each respective case. A special feature is that bandpass and blocker were applied on one side in order to avoid multiple reflections. On the reverse side, one silicon oxide layer was applied for stress compensation, together with an anti-reflective system consisting of four layers. As a result, the back reflection in the transmission wavelength range could be held below 0.2 percent.

Bandpass Filterthorlabs

UV bandpass filter365nm

The work was funded by the German Federal Ministry of Education and Research (BMBF) within the framework of the “EPIC-Lens“ project (FKZ 13N14583), and by the Max Planck Institute for Solar System Research within the framework of the “Sunrise III” project.

Uvphotography

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... wavelengths that excite the FITC molecules. Emission Filter: After the FITC molecules have been excited, they emit light at a longer wavelength. The ...

UV bandpass filterphotography

A Lipson · 2010 · 1072 — Discover Optical Physics, 4th Edition, Ariel Lipson, HB ISBN: 9780521493451 on Higher Education from Cambridge.

The filters were deposited on the EOSS® coating system (Enhanced Optical Sputtering System) developed at the Fraunhofer IST. Coatings for filters in the ultraviolet spectral range must fulfill special requirements, as below 400 nm the absorption and scattering increase significantly. During the production of the filters for the “Sunrise III” mission, the Fraunhofer IST relied on new material. Whilst the established tantalum oxide (Ta2O5) could still be used for the 355 nm and 399 nm filters, novel tube targets made from zirconium oxide (ZrO2) were utilized for the other two. The oxygen present in the target and its particularly high purity therefore enable high transmission and low absorption in conjunction with oxidation through an RF plasma source. Zirconium is significantly less expensive than the often-used hafnium. Zirconium coatings were realized through co-sputtering of silicon. In order to avoid crystallization and resulting stray light, the ZrO2 coatings contain a few percent SiO2.

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Mar 22, 2018 — Fiber optic lighting utilizes optical fiber (flexible fiber made of glass or plastic) to transmit light from a light source to a remote location ...

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