{"id":3888,"date":"2014-09-03T11:35:28","date_gmt":"2014-09-03T11:35:28","guid":{"rendered":"https:\/\/www.ophiropt.com\/blog\/laser-measurement\/?p=3888"},"modified":"2024-09-22T12:53:19","modified_gmt":"2024-09-22T12:53:19","slug":"how-to-profile-large-small-and-high-power-laser-beams","status":"publish","type":"post","link":"https:\/\/www.ophiropt.com\/blog\/how-to-profile-large-small-and-high-power-laser-beams\/","title":{"rendered":"How to Profile Large, Small, and High Power Laser Beams"},"content":{"rendered":"

Don\u2019t you wish there was a one size fits all beam profiler?<\/p>\n

I know I do.<\/p>\n

Problem is that the very thing that makes a beam profiler so perfect for one laser renders it useless for a different laser.<\/p>\n

At risk of overcomplicating matters, we like to provide our customers with maximum flexibility.\u00a0 So, you can get one laser beam profiler and use it with many different kinds of laser beams \u2013 you\u2019ll just need the proper accessories to use with each laser.<\/p>\n

There are two main issues that will come up: laser intensity and beam size.\u00a0 (Wavelength is of course important too, but that has more to do with the type of imaging technique you\u2019ll need than the attenuation or other accessories.)<\/p>\n

Beam Intensity<\/strong><\/p>\n

CCDs are extremely sensitive which means unless you have a very, very<\/em> low power laser, you\u2019ll need to lower the laser power before it reaches the camera.<\/p>\n

The first lines of defense are your ND filters<\/a>.\u00a0 These can attenuate anywhere between half and 99.99% of your laser\u2019s intensity.\u00a0 Since these filters are nearly always used, you get three along with your CCD beam profiler.<\/p>\n

For many lasers, this may be all you need.<\/p>\n

But for high power and energy lasers this might not be enough.<\/p>\n

(The ND filter itself has a damage threshold, not just the CCD, so you have to check the laser intensity both before and after the filter.)<\/p>\n

If you need further attenuation, you can use beam splitters in addition to the ND filters.\u00a0 One beam splitter can divert between 0.5% and 5% of the laser towards your beam profiler.\u00a0 (The rest of the beam passes through the splitter, to a beam dump, your target, or better yet, a laser power meter.)\u00a0 You can also use two or more beam splitters, which multiplies this effect.<\/p>\n

\"\"<\/a><\/p>\n

Laser Beam Splitter and ND filters are used to profile this multi-kilowatt laser.<\/em><\/span><\/p>\n

This takes care of your laser beam intensity.<\/p>\n

What about the size of your laser?<\/strong><\/p>\n

A CCD profiler, like any camera is made up of many pixels.\u00a0 If your laser beam is very small (less than 10\u00a0microns, for example), you will need to use a beam expander to improve resolution.\u00a0 (Added benefit: the beam hits the camera at a larger size, meaning the intensity of the laser hitting the CCD is lower than the laser\u2019s actual intensity.\u00a0 Also, the more pixels that are illuminated on the imager, the better chance of an accurate measurement.)<\/p>\n

Of course, if your laser beam is too large (greater than 5 \u2013 30 mm, depending on the camera), it simply won\u2019t fit in the camera\u2019s aperture or imager.\u00a0 If you have this issue, you\u2019ll need to use a laser beam reducer.<\/p>\n

Take care when using a reducer that you consider the increase in intensity after the reducer (since a smaller beam has a higher power density).<\/p>\n

Find out more about laser beam attenuation and optics:<\/strong><\/p>\n

    \n
  1. \u00a0 \u00a0 What Is an ND Filter? How You Should (and Shouldn\u2019t) Use It<\/a><\/li>\n
  2. \u00a0 \u00a0 Stacking ND Filters: The Right Way and the Wrong Way<\/a><\/li>\n
  3. \u00a0 \u00a0 Beam Splitters for Serious Laser Power Attenuation [coming soon]<\/li>\n
  4. \u00a0 \u00a0 Using a Laser Beam Expander \u2013 How and When?<\/a><\/li>\n
  5. \u00a0 \u00a0 Laser Beam Too Big to Profile?\u00a0 Reduce It!<\/a><\/li>\n
  6. \u00a0 \u00a0 Two Different Ways to Expand Your Laser Beam: Are You Using the Right Method?<\/a><\/li>\n
  7. \u00a0 \u00a0\u00a0Laser Beam Profiler Attenuation: The Right Way and the Wrong Way<\/a><\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

    Don\u2019t you wish there was a one size fits all beam profiler? I know I do. Problem is that the […]<\/p>\n","protected":false},"author":2,"featured_media":8592,"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 center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[3],"tags":[86,21],"ophirposttype":[349],"class_list":["post-3888","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-laser-beam-analysis","tag-accessories-beam","tag-cameras","ophirposttype-blogpost-en"],"yoast_head":"\nHow to Profile Large, Small, and High Power Laser Beams - Ophir Photonics<\/title>\n<meta name=\"description\" content=\"Don\u2019t you wish there was a one size fits all beam profiler? 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