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Express"],"published-print":{"date-parts":[[2026,6,29]]},"abstract":"<jats:p>\n                    What we believe to be a novel approach is proposed and theoretically justified to achieve the extremely high spectral purity and high diffraction efficiency of a wideband multilayer-coated blazed grating (BMG) in the tender X-ray range (2.5-3\u2005keV photon energy). The key feature consists of depositing a 70\u2005nm thick B\n                    <jats:sub>4<\/jats:sub>\n                    C film on the BMG surface with subsequent removal of the saw-tooth relief by polishing. Such a design allows suppressing the low-energy parasitic radiation intensity by a factor exceeding 10\n                    <jats:sup>4<\/jats:sup>\n                    on the grating surface through reflection from the film in the total external reflection conditions. A high diffraction efficiency of 8-21% for the -2\n                    <jats:sup>nd<\/jats:sup>\n                    order can be achieved at the same time.\n                  <\/jats:p>","DOI":"10.1364\/oe.590969","type":"journal-article","created":{"date-parts":[[2026,6,15]],"date-time":"2026-06-15T05:00:09Z","timestamp":1781499609000},"page":"24155","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Ultimate spectral purity of the tender X-ray radiation diffracted from a wideband multilayer coated blazed grating"],"prefix":"10.1364","volume":"34","author":[{"given":"Igor V.","family":"Kozhevnikov","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/03rc6as71","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-1819-3521","authenticated-orcid":true,"given":"Shengyou","family":"Wen","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/03rc6as71","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7935-6015","authenticated-orcid":true,"given":"Qiushi","family":"Huang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/03rc6as71","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhong","family":"Zhang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/03rc6as71","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhanshan","family":"Wang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/03rc6as71","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2026,6,23]]},"reference":[{"key":"oe-34-13-24155-R1","doi-asserted-by":"publisher","first-page":"174","DOI":"10.1117\/12.407557","type":"journal-article","volume":"4138","author":"Seely","year":"2000","journal-title":"Proc. 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