{"id":3325,"date":"2013-11-27T13:11:33","date_gmt":"2013-11-27T13:11:33","guid":{"rendered":"https:\/\/www.ophiropt.com\/blog\/laser-measurement\/?p=3325"},"modified":"2024-09-24T12:51:33","modified_gmt":"2024-09-24T12:51:33","slug":"when-can-you-use-a-scanning-slit-beam-profiler-for-pulsed-lasers","status":"publish","type":"post","link":"https:\/\/www.ophiropt.com\/blog\/when-can-you-use-a-scanning-slit-beam-profiler-for-pulsed-lasers\/","title":{"rendered":"When Can You Use a Scanning-Slit Beam Profiler for Pulsed Lasers?"},"content":{"rendered":"<p>Scanning slit profilers (such as Ophir\u2019s <a href=\"https:\/\/www.ophiropt.com\/en\/c\/nanoscan-profilers\" target=\"_blank\" rel=\"noopener noreferrer\">NanoScan<\/a>) boast several advantageous qualities, such as the ability to measure high powers without attenuation, relatively inexpensive infrared compatibility, and more.<br \/>But when someone mentions pulsed beams, several questions seem to pop up out of nowhere: What\u2019s your pulse frequency? Beam width? What kind of accuracy are you looking for?<br \/>You may be wondering \u2013 understandably so \u2013 why these matters.<br \/>Let\u2019s take a step back and examine the inner workings of a scanning slit beam profiler, assuming for a moment that we\u2019re working with a CW laser for simplicity.<!--more--><\/p>\n<p>\u00a0<\/p>\n<p>\u00a0<\/p>\n<p>As you can see in the above diagram, a scanning-slit profiler has a fairly complex design.\u00a0 Here\u2019s how it works: Inside the head is a drum which spins at a 45\u00b0 angle.\u00a0 This drum has two slits on it, one for each axis of the laser.\u00a0 At the core of the head there is a single detector element, which measures just the portion of the laser that the slit allows to pass.<\/p>\n<p>The whole beam profiling process is done with one drum revolution in less than a second, but the <a href=\"https:\/\/www.ophiropt.com\/en\/c\/laser-beam-profilers\" target=\"_blank\" rel=\"noopener noreferrer\">profiler<\/a> continues to operate (and the drum keeps spinning) to continue to profile your laser beam in real time.<\/p>\n<p>Now, let\u2019s return to our pulsed laser beam.\u00a0 Since the drum revolves at a given rate and the laser beam has a certain diameter, we can calculate the amount of time it takes the slit to move from one side of the laser beam diameter to the other.\u00a0 Let\u2019s say we calculated this time to be 1 ms.\u00a0 In a CW beam, this means we\u2019d measure the profile of the laser for 1 ms.\u00a0 But in a pulsed beam, we have to check how many pulses occur in that millisecond.\u00a0 The more pulses (i.e., the higher the laser pulse frequency) the more accurate our beam profile will be.<\/p>\n<p><a href=\"\/blog\/wp-content\/uploads\/2013\/11\/CW-profile.jpg\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-3328 lazyload\" title=\"CW profile\" data-src=\"\/blog\/wp-content\/uploads\/2013\/11\/CW-profile.jpg\" alt=\"\" width=\"579\" height=\"290\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 579px; --smush-placeholder-aspect-ratio: 579\/290;\" \/><\/a><\/p>\n<p>In the example sketched above, the laser pulses seven times as the slit traverses it.\u00a0 The beam profiler software connects the dots by looking at the peaks and estimates the \u201cCW profile.\u201d\u00a0 As you can imagine, the more pulses in that profile, the better the software can estimate the real profile, giving a more accurate beam width result.<\/p>\n<p>As a rule of thumb, the minimum number of pulses required for one profile is about 8-10, while 15 pulses are needed to achieve 2% accuracy.<\/p>\n<h2>Now for the calculation<\/h2>\n<p>There\u2019s one more caveat: if you want to calculate the slit speed directly from the drum speed, you need to account for the angle of rotation (45\u00b0).\u00a0 Therefore, the actual speed of the slit across the laser beam is the drum speed divided by.<\/p>\n<p>The following equation takes laser pulse frequency and number of pulses per profile as given parameters to calculate the minimum laser beam diameter:<\/p>\n<p style=\"text-align: center;\" align=\"center\"><a href=\"\/blog\/wp-content\/uploads\/2013\/11\/1.png\"><img decoding=\"async\" class=\"aligncenter wp-image-3329 lazyload\" title=\"1\" data-src=\"\/blog\/wp-content\/uploads\/2013\/11\/1.png\" alt=\"\" width=\"190\" height=\"56\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 190px; --smush-placeholder-aspect-ratio: 190\/56;\" \/><\/a><\/p>\n<p>where <em>d<\/em> is the drum diameter, <em>f<\/em> is the frequency of the drum or laser, respectively, <em>N<\/em> is the number of pulses per profile, and <em>D<\/em> is the minimum allowed laser beam diameter.<\/p>\n<p>This <a href=\"https:\/\/www.ophiropt.com\/laser--measurement\/knowledge-center\/article\/8127?r=blog\" target=\"_blank\" rel=\"noopener noreferrer\">tutorial<\/a> provides more information as well as a table to calculate the minimum laser beam diameter for any combination of drum size and speed at various laser pulse rates (from 1 kHz to 150 kHz).<\/p>\n<p>\u00a0<\/p>\n<p><em>You might also like to read:\u00a0<\/em><\/p>\n<address><a title=\"Permanent Link to Why choose scanning slit based laser beam profilers?\" href=\"\/?p=2230\" target=\"_blank\" rel=\"bookmark noopener\">Why choose scanning slit based laser beam profilers?<\/a><\/address>\n<p>and:<\/p>\n<address><a title=\"Permanent Link to How to Profile Very Short Pulsed Laser Beams\" href=\"\/?p=3064\" target=\"_blank\" rel=\"bookmark noopener\">How to Profile Very Short Pulsed Laser Beams<\/a><\/address>\n<p>\u00a0<\/p>\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Scanning slit profilers (such as Ophir\u2019s NanoScan) boast several advantageous qualities, such as the ability to measure high powers without [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":8648,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[3],"tags":[16,64,66],"ophirposttype":[349],"class_list":["post-3325","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-laser-beam-analysis","tag-beam-profiling","tag-pulsed","tag-scanning-slit","ophirposttype-blogpost-en"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>When Can You Use a Scanning-Slit Beam Profiler for Pulsed Lasers? - Ophir Photonics<\/title>\n<meta name=\"description\" content=\"Scanning slit profilers (such as Ophir\u2019s NanoScan) boast several advantageous qualities, such as the ability to measure high powers without attenuation,\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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