{"id":"https://openalex.org/keywords/grating-efficiency","display_name":"grating efficiency","description":"Grating efficiency is the fraction of incident optical power diffracted by a diffraction grating into a specified order or direction.","display_name_alternatives":["diffraction grating efficiency","grating diffraction efficiency","diffraction efficiency of gratings"],"ids":{"openalex":"https://openalex.org/keywords/grating-efficiency","wikidata":"https://www.wikidata.org/wiki/Q850922"},"primary_topic":{"id":"https://openalex.org/T11723","display_name":"Optical Coatings and Gratings","score":0.4228,"subfield":{"id":"https://openalex.org/subfields/2508","display_name":"Surfaces, Coatings and Films"},"field":{"id":"https://openalex.org/fields/25","display_name":"Materials Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T11723","display_name":"Optical Coatings and Gratings","score":0.4228,"subfield":{"id":"https://openalex.org/subfields/2508","display_name":"Surfaces, Coatings and Films"},"field":{"id":"https://openalex.org/fields/25","display_name":"Materials Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T12917","display_name":"Astronomy and Astrophysical Research","score":0.1365,"subfield":{"id":"https://openalex.org/subfields/3105","display_name":"Instrumentation"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"works_count":673,"cited_by_count":9425,"works_api_url":"https://api.openalex.org/works?filter=keywords.id:keywords/grating-efficiency","updated_date":"2026-10-23T04:06:34","created_date":"2026-09-30T00:00:00"}