Diffraction gratings are widely used optical components featuring periodic structures that allow dispersion of light in a more compact, convenient format than a prism. They operate on the principle of interference to split multi-spectral light into its constituent wavelengths and, like a prism, disperse them spatially through a range of angles. The most common type of grating structure uses numerous parallel rulings on a surface in a manner similar to a series of slits, resulting in a superposition of waves that diffract light by wavelength, effectively separating it into its colors. This is not the only fundamental design type of diffraction grating, but it has become the widely-used standard for many applications.

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Holographic gratings are designed to eliminate many of the errors associated with conventional surface relief components. Briefly, they are engineered by selectively exposing a substrate or photoreactive material on the substrate to a laser generated optical interference pattern of outstanding uniformity. This action then ‘writes’ a periodic structure into the chosen medium. Holography is now the gold-standard manufacturing technique for diffraction gratings. Learn more about the advantages of VPH gratings.

There are many types of diffraction gratings, which can make the selection process tricky. This article is intended to act as a brief primer on the different types of diffraction gratings to help you select the right one for your application needs.

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Gratings alter the phase of reflected or transmitted light based on their unique structural properties. A conventional surface relief grating is engineered by ruling a substrate material with equally-spaced grooves, creating the popular and easily recognizable ‘blazed’ surface. This is an expensive and time-consuming design process that may require multiple test gratings to be fabricated via diamond tooling before the final component is produced via replication. Ruled gratings also suffer from fairly high light scattering. Once manufactured, a ruled grating must be handled with care, as it cannot be cleaned without significant risk of damage. Dust, fingerprints, or other contamination adds to the inherent scatter of the grating over time.

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How is the Adjusted Target Resolution Time calculated for SLA's? The Adjusted Target Resolution Time is later than the Target Finish. Why is that?

Reflection or transmission is one of the most fundamental distinctions in diffraction grating terminology. Essentially, a reflection grating diffracts light back into the plane of incidence while transmission gratings transmit dispersed light through. Due to the ability to better compensate for aberrations, optical systems made with transmission gratings have comparatively low alignment sensitivity, which can be a significant benefit for applications where minute alignment errors or temperature changes could wreak havoc on results. Consequently, transmission gratings are preferred over reflective components for many OEM applications.

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Here is another example: If resolution time is 2 days (shift is 8x5) and ticket is created on July 1, 2015 at 12:00, target finish will be set to July 3, 2015, and the adjustedtargetresolutiontime will be set to value July 9, 2015 at 12:00. I will explain why it is much later than the target finish. In the case presented at the beginning, the math is simpler since we have 8 hour work days and days of 24 hours divide evenly. So, each "day" will be exactly three work shifts of 8 hours, and if you only have a single shift per day, then essentially it will be triple the days. For additional reading on how this works see:

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f {\displaystyle f}. {\displaystyle f}. die Brennweite der Linse und; D {\displaystyle D}. {\displaystyle D}. die Brechkraft. Für optische Systeme mit gleichen ...

This is a common misunderstanding with regards to time stamps, adjusted times and SLAs. The adjusted time is measured in hours and when resolution is set to days, those are 24 hours each. When those hours are compared to a 8 hour work day (or whatever you set your work day to), it stretches the adjusted finish time further out. For this example, let's use a 13 hour work day and even add the extra complexity of using SLA Hold. Here is how it works: - 3 days x 24 hours = 72 hour in order to finish the Resolution SLA or Resolution Target. - 72 hours / 13 hour work day = 5 days (of 13 hours each) and 7 hours. - When you add 5 days and 7 hours to the Reported Date of 2/18 at 08:48 and accounting for weekends, you get an Adjusted Finish of 2/25 15:48. Then add the hold time of 1 minute and it adds that too to make it 15:49. Here is another example: If resolution time is 2 days (shift is 8x5) and ticket is created on July 1, 2015 at 12:00, target finish will be set to July 3, 2015, and the adjustedtargetresolutiontime will be set to value July 9, 2015 at 12:00. I will explain why it is much later than the target finish. In the case presented at the beginning, the math is simpler since we have 8 hour work days and days of 24 hours divide evenly. So, each "day" will be exactly three work shifts of 8 hours, and if you only have a single shift per day, then essentially it will be triple the days. For additional reading on how this works see: here on DevWorks site: https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki/IBM%20Maximo%20Asset%20Management/page/Configuring%20SLAs and here in our manuals: http://www-01.ibm.com/support/knowledgecenter/SSLKT6_7.5.0.3/com.ibm.mbs.doc/sla/c_calendars_slas.html

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here on DevWorks site: https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki/IBM%20Maximo%20Asset%20Management/page/Configuring%20SLAs and here in our manuals: http://www-01.ibm.com/support/knowledgecenter/SSLKT6_7.5.0.3/com.ibm.mbs.doc/sla/c_calendars_slas.html

But we can extend the different types of diffraction gratings further to discuss the new and emerging manufacturing techniques for holographic gratings. Etched-in relief gratings comprised of fused silica and volume phase holographic (VPH) diffraction gratings, for instance, are two radically different design paradigms for modern optical systems. While both offer significantly higher efficiency than ruled gratings, VPH grating technology offers the optical engineer more design options to achieve the desired efficiency profile.