{"id":484312,"date":"2021-06-16T17:21:39","date_gmt":"2021-06-16T21:21:39","guid":{"rendered":"https:\/\/www.rochester.edu\/newscenter\/?p=484312"},"modified":"2023-02-17T11:27:06","modified_gmt":"2023-02-17T16:27:06","slug":"novel-chirped-pulses-defy-conventional-wisdom-484312","status":"publish","type":"post","link":"https:\/\/www.rochester.edu\/newscenter\/novel-chirped-pulses-defy-conventional-wisdom-484312\/","title":{"rendered":"Novel chirped pulses defy \u2018conventional wisdom\u2019"},"content":{"rendered":"<h2 style=\"width: 85%; font-weight: bold; line-height: 135%; margin-bottom: 0.5em;\">Rochester researchers advance groundbreaking technique first pioneered at the Laboratory for Laser Energetics.<\/h2>\n<p>The 2018 Nobel Prize in Physics was shared by researchers who pioneered a technique to create ultrashort, yet extremely high-energy laser pulses at the <a href=\"https:\/\/rochester.edu\">Ä¢¹½´«Ã½<\/a>.<\/p>\n<p>Now researchers at the University\u2019s <a href=\"https:\/\/www.hajim.rochester.edu\/optics\/\">Institute of Optics<\/a> have produced those same high-powered pulses\u2014known as chirped pulses\u2014in a way that works even with relatively low-quality, inexpensive equipment. The new work could pave the way for:<\/p>\n<ul>\n<li>Better high-capacity telecommunication systems<\/li>\n<li>Improved astrophysical calibrations used to find exoplanets<\/li>\n<li>Even more accurate atomic clocks<\/li>\n<li>Precise devices for measuring chemical contaminants in the atmosphere<\/li>\n<\/ul>\n<p>In a <a href=\"https:\/\/www.osapublishing.org\/optica\/fulltext.cfm?uri=optica-8-6-861&amp;id=451795\">paper in <em>Optica<\/em><\/a>, the researchers describe the first demonstration of highly chirped pulses created by a using a spectral filter in a Kerr resonator\u2014a type of simple optical cavity that operates without amplification. These cavities have stirred wide interest among researchers because they can support \u201ca wealth of complicated behaviors including useful broadband bursts of light,\u201d says coauthor <a href=\"https:\/\/www.hajim.rochester.edu\/optics\/people\/faculty\/renninger_william\/index.html\">William Renninger<\/a>, assistant professor of optics.<\/p>\n<p>By adding the spectral filter, the researchers can manipulate a laser pulse in the resonator to widen its wavefront by separating the beam\u2019s colors.<\/p>\n<p>The new method is advantageous because \u201cas you widen the pulse, you\u2019re reducing the peak of the pulse, and that means you can then put more overall energy into it before it reaches a high peak power that causes problems,\u201d Renninger says.<\/p>\n<p>The new work is related to the approach used by <a href=\"https:\/\/www.rochester.edu\/newscenter\/rochesters-breakthrough-in-laser-science-earns-nobel-prize-340302\/\">Nobel laureates Donna Strickland \u201989 (PhD) and Gerard Mourou<\/a>, who helped usher in a revolution in the use of laser technology when they pioneered chirped pulse amplification while doing research at the University\u2019s <a href=\"https:\/\/www.lle.rochester.edu\">Laboratory for Laser Energetics<\/a>.<\/p>\n<p>The work takes advantage of the way light is dispersed as it passes through optical cavities. Most prior cavities require rare \u201canomalous\u201d dispersion, which means that the blue light travels faster than red light.<\/p>\n<p>However, the chirped pulses live in \u201cnormal\u201d dispersion cavities in which red light travels faster. The dispersion is called \u201cnormal\u201d because it is the much more common case, which will greatly increase the number of cavities that can generate pulses.<\/p>\n<p>Prior cavities are also designed to have less than one percent loss, whereas the chirped pulses can survive in the cavity despite very high energy loss. \u201cWe\u2019re showing chirped pulses that remain stable even with more than 90 percent energy loss, which really challenges the conventional wisdom,\u201d Renninger says.<\/p>\n<p>\u201cWith a simple spectral filter, we are now <em>using<\/em> loss to generate pulses in lossy and normal dispersion systems. So, in addition to improved energy performance, it really opens up what kinds of systems can be used.\u201d<\/p>\n<p>Other collaborators include lead author Christopher Spiess, Qiang Yang, and Xue Dong, all current and former graduate research assistants in <a href=\"https:\/\/labsites.rochester.edu\/renninger\/\">Renninger\u2019s lab<\/a>, and Victor Bucklew, a former postdoctoral associate in the lab.<\/p>\n<p>\u201cWe\u2019re very proud of this paper,\u201d Renninger says. \u201cIt has been a long time coming.\u201d<\/p>\n<p>The Ä¢¹½´«Ã½ and the National Institute of Biomedical Imaging and Bioengineering at the National Institutes of Health supported this project with funding.<\/p>\n<hr \/>\n<h3><strong>Read more<\/strong><\/h3>\n<div class=\"large-up-3\">\n<div class=\"column\" style=\"padding-left: 0px;\"><a href=\"https:\/\/www.rochester.edu\/newscenter\/nanojunctions-generating-electricity-faster-than-ever-before-325952\/\"><img decoding=\"async\" style=\"margin-bottom: 10px;\" src=\"https:\/\/www.rochester.edu\/newscenter\/wp-content\/uploads\/2018\/06\/fea-nanojunctions-franco.jpg\" alt=\"illustration of a laser pulse on glass-like beads.\" \/><strong>Laser bursts generate electricity faster than any other method<\/strong><\/a><\/p>\n<p><span style=\"font-size: .9em;\">A University researcher who predicted that laser pulses could generate ultrafast electrical currents in theory believes he can explain how and why experiments to create these currents have succeeded.<\/span><\/div>\n<div class=\"column\" style=\"padding-left: 0px;\"><a href=\"https:\/\/www.rochester.edu\/newscenter\/rochesters-breakthrough-in-laser-science-earns-nobel-prize-340302\/\"><img decoding=\"async\" style=\"margin-bottom: 10px;\" src=\"https:\/\/www.rochester.edu\/newscenter\/wp-content\/uploads\/2018\/10\/fea-mourou-strickland.jpg\" alt=\"two archival photos of G\u00e9rard Mourou and Donna Strickland.\" \/><strong>Rochester breakthrough in laser science earns Nobel Prize<\/strong><\/a><\/p>\n<p><span style=\"font-size: .9em;\">Ä¢¹½´«Ã½ graduate Donna Strickland \u201989 (PhD) and former optics faculty member G\u00e9rard Mourou shared the 2018 Nobel Prize in Physics for work they undertook at the Laboratory for Laser Energetics.<\/span><\/div>\n<div class=\"column\" style=\"padding-left: 0px;\"><a href=\"https:\/\/www.rochester.edu\/newscenter\/rochester-versatile-ultrafast-laser-pulse-445912\/\"><img decoding=\"async\" style=\"margin-bottom: 10px;\" src=\"https:\/\/www.rochester.edu\/newscenter\/wp-content\/uploads\/2021\/06\/fea-stretched-pulse-image.jpg\" alt=\"illustration of stretched-pulse soliton Kerr resonator.\" \/><strong>Project creates more powerful, versatile ultrafast laser pulse<\/strong><\/a><\/p>\n<p><span style=\"font-size: .9em;\">Institute of Optics research sets record for shortest pulse for newly developed technology, work that has important applications in engineering and biomedicine.<\/span><\/div>\n<\/div>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Rochester researchers have advanced a groundbreaking technique first pioneered at the University\u2019s Laboratory for Laser Energetics. As a result, they&#8217;ve produced chirped pulses in a way that works even with relatively low-quality, inexpensive equipment.<\/p>\n","protected":false},"author":286,"featured_media":484362,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[116],"tags":[18632,18652,18572,37472],"class_list":["post-484312","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sci-tech","tag-hajim-school-of-engineering-and-applied-sciences","tag-institute-of-optics","tag-research-finding","tag-william-renninger"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Novel chirped pulses defy \u2018conventional wisdom\u2019<\/title>\n<meta name=\"description\" content=\"Ä¢¹½´«Ã½ researchers have produced chirped pulses in a way that works even with relatively low-quality, inexpensive equipment.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.rochester.edu\/newscenter\/novel-chirped-pulses-defy-conventional-wisdom-484312\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Novel chirped pulses defy \u2018conventional wisdom\u2019\" \/>\n<meta property=\"og:description\" content=\"Ä¢¹½´«Ã½ researchers have produced chirped pulses in a way that works even with relatively low-quality, inexpensive equipment.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.rochester.edu\/newscenter\/novel-chirped-pulses-defy-conventional-wisdom-484312\/\" \/>\n<meta property=\"og:site_name\" content=\"News Center\" \/>\n<meta property=\"article:published_time\" content=\"2021-06-16T21:21:39+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-02-17T16:27:06+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.rochester.edu\/newscenter\/wp-content\/uploads\/2021\/06\/fea-novel-chirped-pulses.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1000\" \/>\n\t<meta property=\"og:image:height\" content=\"600\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Bob Marcotte\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Bob Marcotte\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.rochester.edu\\\/newscenter\\\/novel-chirped-pulses-defy-conventional-wisdom-484312\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.rochester.edu\\\/newscenter\\\/novel-chirped-pulses-defy-conventional-wisdom-484312\\\/\"},\"author\":{\"name\":\"Bob Marcotte\",\"@id\":\"https:\\\/\\\/www.rochester.edu\\\/newscenter\\\/#\\\/schema\\\/person\\\/e0d8d271cd290d592461fa9cefca013b\"},\"headline\":\"Novel chirped pulses defy \u2018conventional wisdom\u2019\",\"datePublished\":\"2021-06-16T21:21:39+00:00\",\"dateModified\":\"2023-02-17T16:27:06+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.rochester.edu\\\/newscenter\\\/novel-chirped-pulses-defy-conventional-wisdom-484312\\\/\"},\"wordCount\":633,\"image\":{\"@id\":\"https:\\\/\\\/www.rochester.edu\\\/newscenter\\\/novel-chirped-pulses-defy-conventional-wisdom-484312\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.rochester.edu\\\/newscenter\\\/wp-content\\\/uploads\\\/2021\\\/06\\\/fea-novel-chirped-pulses.jpg\",\"keywords\":[\"Hajim School of Engineering and Applied Sciences\",\"Institute of Optics\",\"research finding\",\"William Renninger\"],\"articleSection\":[\"Science &amp; 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