{"id":2814,"date":"2013-04-10T13:15:48","date_gmt":"2013-04-10T13:15:48","guid":{"rendered":"https:\/\/www.ophiropt.com\/blog\/laser-measurement\/?p=2814"},"modified":"2025-08-27T16:18:51","modified_gmt":"2025-08-27T16:18:51","slug":"bottom-line-what-is-beam-profiling-dynamic-range","status":"publish","type":"post","link":"https:\/\/www.ophiropt.com\/blog\/bottom-line-what-is-beam-profiling-dynamic-range\/","title":{"rendered":"Bottom Line: What Is Beam Profiling Dynamic Range?"},"content":{"rendered":"

What does dynamic range really mean in a laser beam profiler<\/a>?\u00a0 I don\u2019t mean the technical definition.\u00a0 What are its implications?\u00a0 How will having a specific dynamic range help you understand what the camera or scanning slit profiler can do?<\/p>\n

Well, I\u2019m glad you asked.<\/p>\n

I can\u2019t guarantee that you\u2019ll immediately know what a company meant by their dynamic range spec.\u00a0 If you\u2019ve read my last two posts on the subject, you\u2019ll know that this issue is far from clear.\u00a0 (And if you haven\u2019t \u2013 go read them<\/a> now!\u00a0 We\u2019ll be here when you get back.)<\/p>\n

What I can help you with is understanding the possibilities.\u00a0 It\u2019s up to you to track down what the manufacturer meant when he said 500dB.<\/p>\n

So, you know that sometimes beam profiler dynamic range can be measured in dBvolt<\/sub><\/a>, sometimes in dBpower<\/sub> and more often then not it\u2019s just written as dB.<\/p>\n

You also know that sometimes beam profiler manufacturers will state the full digitizer dynamic range (e.g., 12bits = about 72dB), but hopefully most will correctly give the real signal dynamic range.<\/p>\n

Now I\u2019d like to throw in one last monkey wrench:<\/p>\n

Gain<\/h1>\n

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

Most beam profilers<\/a> can be set to various gain levels, which will affect the minimum and maximum measurable power of your laser.\u00a0 Generally speaking, the dynamic range should remain the same regardless of gain, or it might even get worse with higher gain.\u00a0 (Keep in mind that although raising gain increases the maximum it also increases the noise.)<\/p>\n

Let\u2019s use an example.\u00a0 Let\u2019s say my camera can measure from 1mW to 10mW.\u00a0 But I can also increase the gain so it measures either 10mW-100mW, or 100mW-1W.\u00a0 So, the question is: Do I have a camera with a dynamic range of 10:1 (20dBvolt<\/sub>) or 1000:1 (60dBvolt<\/sub>)?<\/p>\n

Here, unlike with the signal versus digitizer issue, there\u2019s no clear right or wrong answer.\u00a0 It really depends on what information you are looking for.\u00a0 If you\u2019d like to know what the complete theoretical range of the camera is, you could say 60dB.\u00a0 If, however, you know that one specific laser might vary more than 20dB, it won\u2019t be sufficient, assuming the gain doesn\u2019t change automatically.\u00a0 In other words, in our example, 60dB represents the range of signals that can be measured, while 20dB more accurately represents the range of a specific signal that can be measured \u2013 without making any changes to the camera parameters.<\/p>\n

Usually, the stricter \u201csingle measurement\u201d dynamic range (i.e., without gain) is the more helpful specification.\u00a0 The main exception to this rule is when the device you are using has an automatic gain, which changes as needed based on the signal.\u00a0 If this is the case, you can really use the beam profiler to measure a highly variant (in power) laser without changing any parameters.<\/p>\n

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

A perfect example of this exception is the automatic gain feature of NanoScan<\/a>, which boasts dynamic range specs for its various detectors in the range of 70dBpower<\/sub> and upwards.\u00a0 That\u2019s over 7 orders of magnitude!\u00a0 (Or 10,000,000:1 if that makes it easier to visualize.)\u00a0 This auto-gain ability makes it easy to measure a laser beam that has varying power density, such as when trying to locate and\/or measure the beam\u2019s focus point.<\/p>\n

Harnessing the Power of Dynamic Range<\/h1>\n

What\u2019s so great about single measurement dynamic range?<\/p>\n

It means that we can measure both the peak and the wings of a laser beam at the same time.\u00a0 This is crucial to accurate beam width or spot size measurements.\u00a0 If your laser beam profiler isn\u2019t sensitive enough, it will essentially chop off part of the wings when calculating the beam width.\u00a0 If the profiler can\u2019t handle high powers, you\u2019ll have issues with the central peak of the laser beam.\u00a0 You can, of course, use attenuation, but then you\u2019re ruining the sensitivity that you need to catch the wings \u2013 and you\u2019re back to square one.<\/p>\n

Clearly, there\u2019s no shortcut around a quality laser beam profiler with a high single measurement dynamic range.<\/p>\n

Bottom Line<\/h1>\n

If you determine whether it\u2019s dBvolt<\/sub> or dBpower<\/sub> you\u2019ll know if the dynamic range is in units of volts or power.<\/p>\n

If you can figure out whether it\u2019s signal or digitizer dynamic range you\u2019ll know whether to trust the spec at all (or whether it\u2019s just an approximation of the actual dynamic range).<\/p>\n

Finally, if you know whether gain is included, you\u2019ll understand exactly what the dynamic range means \u2013 the \u201ctotal achievable\u201d from the lowest to the highest in different circumstances \u2013 or the \u201csingle measurement\u201d range possible in one go.<\/p>\n

Did you find this tutorial helpful?\u00a0 Why not share it with a friend?<\/p>\n

You might also like to read:\u00a0How to analyze high power laser beams<\/a><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

What does dynamic range really mean in a laser beam profiler?\u00a0 I don\u2019t mean the technical definition.\u00a0 What are its […]<\/p>\n","protected":false},"author":2,"featured_media":8625,"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":[16,21,66],"ophirposttype":[349],"class_list":["post-2814","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-laser-beam-analysis","tag-beam-profiling","tag-cameras","tag-scanning-slit","ophirposttype-blogpost-en"],"yoast_head":"\nBottom Line: What Is Beam Profiling Dynamic Range? 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