{"id":9497,"date":"2020-05-06T11:00:24","date_gmt":"2020-05-06T11:00:24","guid":{"rendered":"https:\/\/www.ophiropt.com\/blog\/laser-measurement\/?p=9497"},"modified":"2026-03-15T10:03:03","modified_gmt":"2026-03-15T10:03:03","slug":"how-it-works-measuring-laser-power-with-a-photodiode-sensor","status":"publish","type":"post","link":"https:\/\/www.ophiropt.com\/blog\/how-it-works-measuring-laser-power-with-a-photodiode-sensor\/","title":{"rendered":"How It Works: Measuring Laser Power with a Photodiode Sensor"},"content":{"rendered":"\n<p>There are many\nways to measure laser output: You can use a photodiode, thermopile, or\npyroelectric sensor. This post will discuss how a photodiode measures your\nlaser (basics only) and what types of lasers it is suitable for.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Measurement Mechanism<\/strong><\/h4>\n\n\n\n<p><a href=\"https:\/\/www.ophiropt.com\/en\/c\/photodiode-energy-sensors\">Photodiodes<\/a> measure laser power by using a\nsemiconductor to convert light directly into an electric signal. Ophir\u2019s\npatented background subtraction means you will measure only light from your\nlaser, without ambient light from the room.<\/p>\n\n\n\n<div class=\"wp-block-media-text is-stacked-on-mobile\" style=\"grid-template-columns:43% auto\"><figure class=\"wp-block-media-text__media\"><img decoding=\"async\" width=\"398\" height=\"297\" data-src=\"https:\/\/www.ophiropt.com\/blog\/wp-content\/uploads\/2019\/11\/PD-Blog-post1.png\" alt=\"RM9 with Chopper\" class=\"wp-image-9499 size-full lazyload\" data-srcset=\"https:\/\/www.ophiropt.com\/blog\/wp-content\/uploads\/2019\/11\/PD-Blog-post1.png 398w, https:\/\/www.ophiropt.com\/blog\/wp-content\/uploads\/2019\/11\/PD-Blog-post1-300x224.png 300w, https:\/\/www.ophiropt.com\/blog\/wp-content\/uploads\/2019\/11\/PD-Blog-post1-24x18.png 24w, https:\/\/www.ophiropt.com\/blog\/wp-content\/uploads\/2019\/11\/PD-Blog-post1-36x27.png 36w, https:\/\/www.ophiropt.com\/blog\/wp-content\/uploads\/2019\/11\/PD-Blog-post1-48x36.png 48w\" data-sizes=\"(max-width: 398px) 100vw, 398px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 398px; --smush-placeholder-aspect-ratio: 398\/297;\" \/><\/figure><div class=\"wp-block-media-text__content\">\n<p><strong>Types of Lasers<\/strong><br>You can measure most low to medium power lasers with a photodiode based sensor.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Powers from pW to mW (and even several watts when using attenuating filters, or tens of watts when using an integrating sphere)<\/li>\n\n\n\n<li>Wavelengths from UV to near IR (190 to 1800 nm)<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<ul class=\"wp-block-list\"><\/ul>\n\n\n\n<div class=\"wp-block-media-text alignwide has-media-on-the-right\"><div class=\"wp-block-media-text__content\">\n<p><strong>Strengths<\/strong><br>Photodiodes are by far the most sensitive form of laser power measurement, as well as one of the fastest. Fast photodiode sensor can have a response time of 0.01nanoseconds, while typical photodiode sensors will still be in the microsecond or millisecond range.<\/p>\n<\/div><figure class=\"wp-block-media-text__media\"><img decoding=\"async\" width=\"1024\" height=\"713\" data-src=\"https:\/\/www.ophiropt.com\/blog\/wp-content\/uploads\/2017\/06\/PD300_3W_Stand-1024x713.jpg\" alt=\"pd300\" class=\"wp-image-6864 size-full lazyload\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 1024px; --smush-placeholder-aspect-ratio: 1024\/713;\" \/><\/figure><\/div>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Other Considerations<\/strong><\/h4>\n\n\n\n<p>Photodiode sensors have a distinct wavelength range, so be sure to choose the right device for your laser. They also have higher angular dependence. If that could be an issue for you (if your laser is not going to hit the sensor close to head on) speak to an Ophir representative to see what the best solution is for you.<\/p>\n\n\n\n<p><a href=\"https:\/\/www.ophiropt.com\/en\/c\/photodiode-energy-sensors\">Click here for more information on photodiode power\nmeasurement of lasers.<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This post will discuss how a photodiode measures your laser (basics only) and what types of lasers it is suitable for.<\/p>\n","protected":false},"author":1,"featured_media":9504,"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":[5,390],"tags":[],"ophirposttype":[349],"class_list":["post-9497","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-laser-power-energy-measurement","category-photodiode-sensors","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>How It Works: Measuring Laser Power with a Photodiode Sensor<\/title>\n<meta name=\"description\" content=\"There are many ways to measure laser output: You can use a photodiode, thermopile, or pyroelectric sensor. This post will discuss how a photodiode measures your laser (basics only) and what types of lasers it is suitable for.\" \/>\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.ophiropt.com\/blog\/how-it-works-measuring-laser-power-with-a-photodiode-sensor\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How It Works: Measuring Laser Power with a Photodiode Sensor\" \/>\n<meta property=\"og:description\" content=\"There are many ways to measure laser output: You can use a photodiode, thermopile, or pyroelectric sensor. This post will discuss how a photodiode measures your laser (basics only) and what types of lasers it is suitable for.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.ophiropt.com\/blog\/how-it-works-measuring-laser-power-with-a-photodiode-sensor\/\" \/>\n<meta property=\"og:site_name\" content=\"Ophir Photonics\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/OphirPhotonicsGroup\/\" \/>\n<meta property=\"article:published_time\" content=\"2020-05-06T11:00:24+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-03-15T10:03:03+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.ophiropt.com\/blog\/wp-content\/uploads\/2019\/11\/Measuring-laser-power-with-PD-sensors.png\" \/>\n\t<meta property=\"og:image:width\" content=\"800\" \/>\n\t<meta property=\"og:image:height\" content=\"350\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"OphirBlog\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"OphirBlog\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.ophiropt.com\/blog\/how-it-works-measuring-laser-power-with-a-photodiode-sensor\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.ophiropt.com\/blog\/how-it-works-measuring-laser-power-with-a-photodiode-sensor\/\"},\"author\":{\"name\":\"OphirBlog\",\"@id\":\"https:\/\/www.ophiropt.com\/blog\/#\/schema\/person\/d1146bd4d1105af2b2351f3e579b902b\"},\"headline\":\"How It Works: Measuring Laser Power with a Photodiode Sensor\",\"datePublished\":\"2020-05-06T11:00:24+00:00\",\"dateModified\":\"2026-03-15T10:03:03+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.ophiropt.com\/blog\/how-it-works-measuring-laser-power-with-a-photodiode-sensor\/\"},\"wordCount\":249,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.ophiropt.com\/blog\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.ophiropt.com\/blog\/how-it-works-measuring-laser-power-with-a-photodiode-sensor\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.ophiropt.com\/blog\/wp-content\/uploads\/2019\/11\/Measuring-laser-power-with-PD-sensors.png\",\"articleSection\":[\"Laser Power &amp; Energy Measurement\",\"Photodiode sensors\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.ophiropt.com\/blog\/how-it-works-measuring-laser-power-with-a-photodiode-sensor\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.ophiropt.com\/blog\/how-it-works-measuring-laser-power-with-a-photodiode-sensor\/\",\"url\":\"https:\/\/www.ophiropt.com\/blog\/how-it-works-measuring-laser-power-with-a-photodiode-sensor\/\",\"name\":\"How It Works: Measuring Laser Power with a Photodiode Sensor\",\"isPartOf\":{\"@id\":\"https:\/\/www.ophiropt.com\/blog\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.ophiropt.com\/blog\/how-it-works-measuring-laser-power-with-a-photodiode-sensor\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.ophiropt.com\/blog\/how-it-works-measuring-laser-power-with-a-photodiode-sensor\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.ophiropt.com\/blog\/wp-content\/uploads\/2019\/11\/Measuring-laser-power-with-PD-sensors.png\",\"datePublished\":\"2020-05-06T11:00:24+00:00\",\"dateModified\":\"2026-03-15T10:03:03+00:00\",\"description\":\"There are many ways to measure laser output: You can use a photodiode, thermopile, or pyroelectric sensor. 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