{"id":31633,"date":"2025-04-01T01:30:12","date_gmt":"2025-03-31T20:00:12","guid":{"rendered":"https:\/\/vajiramandravi.com\/current-affairs\/?p=31633"},"modified":"2025-04-16T13:31:56","modified_gmt":"2025-04-16T08:01:56","slug":"carbon-dioxide-lasers","status":"publish","type":"post","link":"https:\/\/vajiramandravi.com\/current-affairs\/carbon-dioxide-lasers\/","title":{"rendered":"Carbon dioxide (CO\u2082) Lasers"},"content":{"rendered":"<h2>Carbon dioxide (CO\u2082) Lasers Latest News<\/h2>\n<p>Physicists in the US have demonstrated a novel technique to detect radioactive materials remotely using carbon dioxide (CO\u2082) lasers.<\/p>\n<h2>About Carbon Dioxide (CO\u2082) Lasers<\/h2>\n<ul>\n<li>The <strong>first CO\u2082 laser<\/strong> was developed by <strong>Indian-American scientist Prof. C.K.N. Patel<\/strong>.<\/li>\n<li>It is a <strong>four-level molecular gas laser<\/strong> that operates using <strong>vibrational energy states of CO\u2082 molecules<\/strong>.<\/li>\n<li><strong>Highly efficient<\/strong>, producing <strong>high-power continuous or pulsed output<\/strong>.<\/li>\n<li><strong>Structure: <\/strong>A <strong>CO\u2082 molecule<\/strong> consists of <strong>one carbon atom<\/strong> at the center and <strong>two oxygen atoms<\/strong> on either side. It vibrates in <strong>three independent modes<\/strong>:\n<ul>\n<li><strong>Symmetric Stretching Mode<\/strong>: Oxygen atoms move <strong>simultaneously<\/strong> towards or away from the <strong>fixed<\/strong> carbon atom.<\/li>\n<li><strong>Bending Mode<\/strong>: Carbon and oxygen atoms vibrate <strong>perpendicular<\/strong> to the molecular axis.<\/li>\n<li><strong>Asymmetric Stretching Mode<\/strong>: Oxygen atoms move in <strong>one direction<\/strong>, while the carbon atom moves in the <strong>opposite direction<\/strong>.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Principle of CO\u2082 Laser: <\/strong>The laser transition occurs between <strong>vibrational energy states<\/strong> of CO\u2082 molecules. Energy is transferred from <strong>excited nitrogen (N\u2082) molecules<\/strong> to CO\u2082, achieving the <strong>population inversion<\/strong> necessary for laser action.<\/li>\n<\/ul>\n<h3>Characteristics of CO\u2082 Laser<\/h3>\n<ul>\n<li><strong>Type<\/strong>: Molecular gas, <strong>four-level laser<\/strong>.<\/li>\n<li><strong>Active medium<\/strong>: Gas mixture of <strong>CO\u2082, N\u2082, and He<\/strong>.<\/li>\n<li><strong>Pumping Method<\/strong>: Electrical discharge.<\/li>\n<li><strong>Optical Resonator<\/strong>: Concave mirrors.<\/li>\n<li><strong>Power Output<\/strong>: Up to 10 kW.<\/li>\n<li><strong>Nature of Output<\/strong>: Continuous wave (CW) or pulsed wave.<\/li>\n<li><strong>Wavelength<\/strong>: 9.6 \u03bcm &amp; 10.6 \u03bcm (Infrared region).<\/li>\n<\/ul>\n<h2>How Does the Detection Work?<\/h2>\n<ul>\n<li><strong>Radioactive decay &amp; ionisation<\/strong>: When a material undergoes <strong>radioactive decay<\/strong>, it emits <strong>charged particles (alpha, beta, or gamma rays)<\/strong> that ionize the surrounding air, creating <strong>plasma<\/strong>.<\/li>\n<li><strong>Avalanche effect<\/strong>: The <strong>free electrons<\/strong> in plasma gain energy and collide with other atoms, releasing <strong>more electrons<\/strong>. This self-sustaining process is called <strong>avalanche breakdown<\/strong> and leads to a chain reaction of ionization.<\/li>\n<li><strong>Laser characteristics<\/strong>: Researchers used a <strong>carbon-dioxide (CO\u2082) laser<\/strong> emitting <strong>long-wave infrared (LWIR) radiation at 9.2 micrometres<\/strong>. The longer wavelength <strong>reduces unwanted ionization<\/strong> and <strong>improves sensitivity<\/strong>.<\/li>\n<li><strong>Detection mechanism<\/strong>: The laser <strong>accelerates seed electrons<\/strong> in the plasma, creating <strong>microplasma balls<\/strong>. These microplasmas generate a <strong>measurable optical backscatter<\/strong> that can be detected and analyzed.<\/li>\n<li><strong>Fluorescence imaging<\/strong>: Used to <strong>analyze the plasma formation dynamics<\/strong> and understand the distribution of seed electrons.<\/li>\n<li><strong>Mathematical model<\/strong>: Developed to <strong>predict backscatter signals<\/strong> based on <strong>plasma seed densities<\/strong>.\n<ul>\n<li><strong>Validation<\/strong>: The model accurately reproduced experimental results, confirming the reliability of the detection technique.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>Advancements in Detection Range<\/h3>\n<figure class=\"table\">\n<table>\n<tbody>\n<tr>\n<td>\n<p><strong>Parameter<\/strong><\/p>\n<\/td>\n<td>\n<p><strong>Previous Techniques<\/strong><\/p>\n<\/td>\n<td>\n<p><strong>New CO\u2082 Laser Technique<\/strong><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p><strong>Alpha particle detection<\/strong><\/p>\n<\/td>\n<td>\n<p><strong>1 meter<\/strong><\/p>\n<\/td>\n<td>\n<p><strong>10 meters<\/strong> (10x improvement)<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p><strong>Gamma ray detection<\/strong> (cs-137)<\/p>\n<\/td>\n<td>\n<p><strong>Limited capability<\/strong><\/p>\n<\/td>\n<td>\n<p><strong>Up to 100 meters<\/strong><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p><strong>Potential future range<\/strong><\/p>\n<\/td>\n<td>\n<p><strong>~10 meters max<\/strong><\/p>\n<\/td>\n<td>\n<p><strong>Possibly 1 km+ with improvements<\/strong><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<ul>\n<li><strong>Alpha particles<\/strong>: Successfully detected from <strong>10 meters away<\/strong> (10x improvement over previous methods).<\/li>\n<li><strong>Gamma rays (Cs-137)<\/strong>: Could potentially be detected from <strong>100 meters away<\/strong> by scaling up laser optics.<\/li>\n<\/ul>\n<h2>Carbon dioxide (CO\u2082) Lasers FAQs<\/h2>\n<p><strong>Q1: <\/strong>What is a Carbon Dioxide (CO\u2082) laser?<br \/>\n<strong>Ans:<\/strong> A CO\u2082 laser is a gas laser that uses a mixture of carbon dioxide, nitrogen, and helium to produce infrared light, widely used in industrial and medical applications.<\/p>\n<p><strong>Q2: <\/strong>What are the applications of CO\u2082 lasers?<br \/>\n<strong>Ans:<\/strong> CO\u2082 lasers are used in cutting, welding, engraving, and medical treatments such as laser surgery and skin resurfacing.<\/p>\n<p><strong>Q3: <\/strong>Why are CO\u2082 lasers preferred for industrial cutting?<br \/>\n<strong>Ans:<\/strong> CO\u2082 lasers have high power efficiency and precision, making them ideal for cutting and engraving metals, plastics, and other materials.<\/p>\n<p><strong>Q4: <\/strong>What is the wavelength of a CO\u2082 laser?<br \/>\n<strong>Ans:<\/strong> The wavelength of a CO\u2082 laser is around 10.6 micrometers (infrared range), which is ideal for heating and cutting applications.<\/p>\n<p><strong>Source: <\/strong><a href=\"https:\/\/www.thehindu.com\/sci-tech\/science\/laser-allows-long-range-detection-of-radioactive-materials\/article69396261.ece#:~:text=The%20researchers%20used%20a%20carbon,by%20a%20factor%20of%2010\" target=\"_blank\" rel=\"nofollow noopener\"><strong>TH<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A CO\u2082 laser is a gas laser that uses a mixture of carbon dioxide, nitrogen &#038; helium to produce infrared light, widely used in industrial, medical applications.<\/p>\n","protected":false},"author":5,"featured_media":31634,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":{"0":"post-31633","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-upsc-prelims-current-affairs","8":"no-featured-image-padding"},"acf":[],"_links":{"self":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/31633","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/comments?post=31633"}],"version-history":[{"count":0,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/31633\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media\/31634"}],"wp:attachment":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media?parent=31633"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/categories?post=31633"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/tags?post=31633"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}