{"id":9176,"date":"2022-08-30T15:45:21","date_gmt":"2022-08-30T13:45:21","guid":{"rendered":"https:\/\/imif.lukasiewicz.gov.pl\/?p=9176"},"modified":"2022-08-30T15:46:16","modified_gmt":"2022-08-30T13:46:16","slug":"qcls-infographics","status":"publish","type":"post","link":"https:\/\/imif.lukasiewicz.gov.pl\/en\/qcls-infographics\/","title":{"rendered":"QCLs: Why They\u2019re So Interesting And How They Can Be Used"},"content":{"rendered":"<div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-1 fusion-flex-container nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start\" style=\"max-width:104%;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-0 fusion_builder_column_1_1 1_1 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:1.92%;--awb-margin-bottom-large:0px;--awb-spacing-left-large:1.92%;--awb-width-medium:100%;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-text fusion-text-1\"><p>Our researchers have prepared a short note on Quantum Cascade Lasers (QCLs) to show you why they\u2019re so interesting and how they can be used.<\/p>\n<p>1)\u00a0\u00a0\u00a0\u00a0\u00a0semiconductor lasers are typically based on interband transitions \u2013 which are electronic transitions between two different bands called valence band and conduction band where electrons and holes recombine and emit photons. In the QCLs, the light emission process is based on intersubband transitions \u2013 transitions between quantized electronic states (subbands) inside the conduction band which makes these devices unipolar \u2013 they utilize only electrons for light emission.<\/p>\n<p>2)\u00a0\u00a0\u00a0\u00a0\u00a0Mid- and long-wave infrared are electromagnetic waves of 3-5\u00a0\u00b5m and 8-14\u00a0\u00b5m\u00a0length (typical for QCLs) whereas the visible light spectrum\u00a0consists of 380-750 nm wavelength. For\u00a0example,\u00a0the most familiar IR device used in our everyday life \u2013 a TV remote equipped with IR light emitting diode \u2013 emits light that is ~940 nanometers\u00a0in wavelength which falls within the range of near-infrared light.<\/p>\n<p>3)\u00a0\u00a0\u00a0\u00a0\u00a0III-V materials are chemical compounds found in QCLs containing elements from groups III and V in the periodic table of chemical elements. These materials are utilized to create structured semiconductor materials with special properties. Such materials are the baseline of many electronic devices and also semiconductor lasers including QCLs. The III-V materials are for example gallium arsenide, gallium antimonide, and indium phosphide.<\/p>\n<p>4)\u00a0\u00a0\u00a0\u00a0\u00a0The active region \u2013 a spot where photon emission takes place, is the heart of a\u00a0semiconductor laser. In QCL it consists of a stack of sequentially placed few-nanometers thick layers of semiconductor materials. This is the\u00a0most important part of the whole laser structure and it requires an ultraprecise growth method e.g. MBE (Molecular Beam Epitaxy).<\/p>\n<p>5)\u00a0\u00a0\u00a0\u00a0\u00a0Applications of QCLs\u00a0are mainly focused on spectroscopy \u2013 studies of the absorption and emission of light and other radiation by matter, especially gasses. Gas sensing systems including QCLs are highly sensitive and can find use in the medical, industrial, and\u00a0environmental protection\u00a0fields. What\u2019s more, the\u00a0mid-IR spectrum region contains an \u201catmospheric window\u201d where electromagnetic waves travel through atmospheric gases with very little\u00a0loss. This makes QCLs\u00a0great sources for Free Space Optics (FSO) communication.<\/p>\n<\/div><div class=\"fusion-image-element \" style=\"--awb-caption-title-font-family:var(--h2_typography-font-family);--awb-caption-title-font-weight:var(--h2_typography-font-weight);--awb-caption-title-font-style:var(--h2_typography-font-style);--awb-caption-title-size:var(--h2_typography-font-size);--awb-caption-title-transform:var(--h2_typography-text-transform);--awb-caption-title-line-height:var(--h2_typography-line-height);--awb-caption-title-letter-spacing:var(--h2_typography-letter-spacing);\"><span class=\" fusion-imageframe imageframe-none imageframe-1 hover-type-none\" class=\"image-magnify\" class=\"image-scroll\"><img width=\"960\" height=\"1280\" alt=\"QCLs infographics\" title=\"QCLs infographics\" src=\"https:\/\/imif.lukasiewicz.gov.pl\/wp-content\/uploads\/2022\/08\/infografika-2.png\" data-orig-src=\"https:\/\/imif.lukasiewicz.gov.pl\/wp-content\/uploads\/2022\/08\/infografika-2.png\" class=\"lazyload img-responsive wp-image-9178\" srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20width%3D%27960%27%20height%3D%271280%27%20viewBox%3D%270%200%20960%201280%27%3E%3Crect%20width%3D%27960%27%20height%3D%271280%27%20fill-opacity%3D%220%22%2F%3E%3C%2Fsvg%3E\" data-srcset=\"https:\/\/imif.lukasiewicz.gov.pl\/wp-content\/uploads\/2022\/08\/infografika-2-200x267.png 200w, https:\/\/imif.lukasiewicz.gov.pl\/wp-content\/uploads\/2022\/08\/infografika-2-400x533.png 400w, https:\/\/imif.lukasiewicz.gov.pl\/wp-content\/uploads\/2022\/08\/infografika-2-600x800.png 600w, https:\/\/imif.lukasiewicz.gov.pl\/wp-content\/uploads\/2022\/08\/infografika-2-800x1067.png 800w, https:\/\/imif.lukasiewicz.gov.pl\/wp-content\/uploads\/2022\/08\/infografika-2.png 960w\" data-sizes=\"auto\" data-orig-sizes=\"(max-width: 800px) 100vw, 960px\" \/><\/span><\/div><\/div><\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":4,"featured_media":9181,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"none","_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","_lmt_disableupdate":"no","_lmt_disable":""},"categories":[86,155,149],"tags":[443,444],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.13 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>QCLs: Why They\u2019re So Interesting And How They Can Be Used<\/title>\n<meta name=\"description\" content=\"Our researchers have prepared a short note on Quantum Cascade Lasers (QCLs) to show you why they\u2019re so interesting and how they can be used.\u00a0\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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