{"id":5267,"date":"2015-08-19T09:00:25","date_gmt":"2015-08-19T09:00:25","guid":{"rendered":"https:\/\/www.ophiropt.com\/blog\/laser-measurement\/?p=5267"},"modified":"2025-01-30T07:55:43","modified_gmt":"2025-01-30T07:55:43","slug":"how-to-measure-low-power-lasers-picowatts-to-watts","status":"publish","type":"post","link":"https:\/\/www.ophiropt.com\/blog\/how-to-measure-low-power-lasers-picowatts-to-watts\/","title":{"rendered":"How to Measure Low Power Lasers (Picowatts to Watts)"},"content":{"rendered":"

There are a few different ways to measure low laser powers, but the most common is the photodiode.\u00a0 Photodiodes translate light energy into electricity (current), which can be measured by a current sensor.<\/p>\n

Ophir uses a few types of photodiodes in its PD300 series<\/a>.<\/p>\n

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

There are a few advantages to the PD300 photodiodes:<\/h2>\n
    \n
  1. Absolute calibration to NIST standards, along their entire wavelength spectrum<\/li>\n
  2. Increased accuracy with background subtraction to remove ambient noise<\/li>\n
  3. Removable filter for wide dynamic range<\/li>\n<\/ol>\n

    But instead of just tooting my own (company\u2019s) horn, let me give you a handy comparison chart, so you can see at-a-glance, which PD300 model is best for you:<\/p>\n

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

    (Note the power is in log scale.)<\/p>\n

    Let\u2019s go through this quickly.<\/p>\n

    What is each PD300 sensor used for?<\/strong><\/p>\n

    First, there\u2019s a common area where many or most models work.\u00a0 Lasers with powers between 0.5 nW and 300 mW, wavelength around 350-1100 nm.\u00a0 If your laser fits these criteria, just pick whatever\u2019s most convenient \u2013 the basic PD300<\/a> probably makes the most sense here.<\/p>\n

    So why are there another six models?<\/p>\n

      \n
    1. PD300-3W<\/a>:\u00a0As the name might suggest, this is a high power photodiode, that can measure up to 3 W, with its filter in place.\u00a0 Without the filter, it can go down to 5 nW \u2013 a dynamic range of almost 9 decades.<\/li>\n
    2. PD300-1W<\/a>:\u00a0This sensor is a less expensive version of the PD300-3W that measures up to 1 Watt.<\/li>\n
    3. PD300-TP<\/a>: Also measuring up to 1 W and all the way down to 50 pW (more than 10 decades!), the real advantage of the TP sensor is its thin profile.\u00a0 The tip of the sensor (the part used to measure power) is actually only 4 mm thin, so it can be slipped into crowded optical setups.<\/li>\n
    4. PD300-UV<\/a> \/ PD300-UV-193<\/a>: UV of course is used to measure UV (ultraviolet) sources.\u00a0 Both versions measure down to 200 nm, while the 193 version is calibrated at 193 nm as well for Excimer laser measurement. \u00a0The PD300-UV is also the most sensitive silicon sensor measuring down to 20 pW.<\/li>\n
    5. PD300-IR<\/a>: Similarly, the IR sensor is used to measure infrared sources.\u00a0 This is a Germanium detector, so its response curve is about 0.7-1.8 microns.\u00a0 It has a smaller dynamic range than the other (Silicon) detectors, but if you need to measure IR beams 5 nW and up, this is the sensor of choice.<\/li>\n
    6. PD300-IRG<\/a>: This InGaAs-based photodiode is mainly used for telecom applications. \u00a0(Optional fiber adapters are available.) \u00a0Although its spectral response is narrower than the Ge detector (0.8-1.7 microns), it is the most sensitive of the entire PD300 family, measuring all the way down to 10 pW.<\/li>\n<\/ol>\n

      There are also round photodiodes<\/a> available for the basic, UV, IR and 3W versions. \u00a0Other than the shape, most of the specs will be the same.<\/p>\n

      Whatever you need, there\u2019s a PD300 power sensor<\/a>\u00a0for you.<\/p>\n","protected":false},"excerpt":{"rendered":"

      There are a few different ways to measures laser power, but the most common is the photodiode. Photodiodes translate light energy into electricity (current), which can be measured by a current sensor.<\/p>\n

      Ophir uses a few types of photodiodes in its PD300 series.<\/p>\n","protected":false},"author":2,"featured_media":8532,"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":[5,6],"tags":[53],"ophirposttype":[349],"class_list":["post-5267","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-laser-power-energy-measurement","category-laser-power-energy-sensors-en","tag-low-power","ophirposttype-blogpost-en"],"yoast_head":"\nHow to Measure Low Power Lasers (Picowatts to Watts) - Ophir Photonics<\/title>\n<meta name=\"description\" content=\"There are a few different ways to measures laser power, but the most common is the photodiode. 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