--- title: WG-GAT Diffraction Efficiency Measurement | OptoFidelity description: "Watch our Mini Webinar about WG-GATs new feature: Diffraction Efficiency" image: https://www.optofidelity.com/hubfs/Products/WG-GAT/WGGAT%20%281%29.jpg --- [Skip to content](https://www.optofidelity.com/insights/webinars/diffraction-efficiency#h1) [OptoFidelity ![OptoFidelity logo](https://www.optofidelity.com/hubfs/raw_assets/public/optofidelity-theme/assets/images/logo.svg) ](https://www.optofidelity.com/en/) Toggle menu - [ Products ](https://www.optofidelity.com/insights/webinars/diffraction-efficiency#) - AR/VR/MR Testing [ AR/VR/MR Testing ](https://www.optofidelity.com/en/ar-vr-testing) Improve the quality of your waveguides and smart glasses with precise test systems - AR/VR products [ Production MTF ](https://www.optofidelity.com/production-mtf) High-Resolution Automated Waveguide Image Quality Measurement System [ Production IQ ](https://www.optofidelity.com/production-iq) Automated Waveguide Image Quality Measurement for AR Waveguide Manufacturing [ WG-IQ ](https://www.optofidelity.com/en/products/wg-iq) Fully automated waveguide image quality measurement system [ WG-GAT ](https://www.optofidelity.com/en/products/wg-gat) High-accuracy diffractometer for AR waveguide characterization [ BUDDY ](https://www.optofidelity.com/en/products/buddy) Performance testing system for AR/VR/MR glasses [ Services & support ](https://www.optofidelity.com/en/service-and-support) Learn more about our services and support. 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Advance your career with OptoFidelity and check our open positions. - [Contact us](https://www.optofidelity.com/en/contact-us) - Open search Close search This is a search field with an auto-suggest feature attached. - There are no suggestions because the search field is empty. ![wg-gat-banner](https://www.optofidelity.com/hs-fs/hubfs/Products/WG-GAT/wg-gat-banner.png?width=2000&name=wg-gat-banner.png) # WG-GAT Diffraction Efficiency ## **Mini-Webinar** 11 September 2024 OptoFidelity WG-GAT is a high-accuracy Diffractometer for AR waveguide grating characterization.  In this Mini-Webinar our Product Owner Haoxue Wang, will explain a new feature of WG-GAT: Diffraction Efficiency.  The Diffraction Efficiency Measurement is a ratio of the power of the incident laser beam (before the diffraction from the grating) vs. the diffracted laser beam (after the diffraction from the grating). With the DEM you can detect deviations of efficiency across a grating. Learn how WG-GAT measures the Diffraction Efficiency by watching our Mini-Webinar. 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