{"id":8853,"date":"2026-10-26T09:00:00","date_gmt":"2026-10-26T00:00:00","guid":{"rendered":"https:\/\/toyo-glass.co.jp\/english\/?p=8853"},"modified":"2026-10-25T19:44:30","modified_gmt":"2026-10-25T10:44:30","slug":"difference-in-back-reflection-at-45-degrees-and-41-degrees","status":"publish","type":"post","link":"https:\/\/toyo-glass.co.jp\/english\/difference-in-back-reflection-at-45-degrees-and-41-degrees\/","title":{"rendered":"Difference in Back Reflection at 45 degrees and 41 degrees"},"content":{"rendered":"\n
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In the case of<\/strong> 45-degree<\/strong> polishing,<\/strong> the beam is emitted perpendicularly below the fiber, but the back-reflected light from the bottom of the fiber returns to the SMF and light source along the same optical path and at the same angle.<\/p>\n\n\n\n

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In the case of 41-degree polishing,<\/strong> the light is emitted slightly in front of the fiber tip, and the back-reflected light from the bottom of the fiber hits the angled polished surface at a different angle<\/em> than the emitted light. According to Snell’s law, the light is propagated as “stray light” along a different optical path from the outgoing light.<\/p>\n\n\n\n

This reflection and propagation reduces the noise of the back-reflected light, so<\/strong> TOYO recommends<\/strong> 41-degree<\/strong> polishing and makes it<\/strong> our<\/strong> standard.<\/strong><\/p>\n\n\n\n

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<\/path><\/svg>SILICAGRIN Home<\/span><\/a><\/div>\n<\/div>\n\n\n\n
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Back Number<\/span><\/path><\/svg><\/a><\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n

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In the case of 45-degree polishing, the beam is emitted perpendicularly below the fiber, but the back-reflecte […]<\/p>\n","protected":false},"author":2,"featured_media":8856,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"swell_btn_cv_data":"","footnotes":""},"categories":[67],"tags":[68],"class_list":["post-8853","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technical-note","tag-68"],"acf":[],"_links":{"self":[{"href":"https:\/\/toyo-glass.co.jp\/english\/wp-json\/wp\/v2\/posts\/8853","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/toyo-glass.co.jp\/english\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/toyo-glass.co.jp\/english\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/toyo-glass.co.jp\/english\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/toyo-glass.co.jp\/english\/wp-json\/wp\/v2\/comments?post=8853"}],"version-history":[{"count":7,"href":"https:\/\/toyo-glass.co.jp\/english\/wp-json\/wp\/v2\/posts\/8853\/revisions"}],"predecessor-version":[{"id":8881,"href":"https:\/\/toyo-glass.co.jp\/english\/wp-json\/wp\/v2\/posts\/8853\/revisions\/8881"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/toyo-glass.co.jp\/english\/wp-json\/wp\/v2\/media\/8856"}],"wp:attachment":[{"href":"https:\/\/toyo-glass.co.jp\/english\/wp-json\/wp\/v2\/media?parent=8853"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/toyo-glass.co.jp\/english\/wp-json\/wp\/v2\/categories?post=8853"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/toyo-glass.co.jp\/english\/wp-json\/wp\/v2\/tags?post=8853"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}