Old 06-09-2008, 11:26 PM #1
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Default Divergence

How is divergence measured?


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Old 06-09-2008, 11:43 PM #2
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Default Re: Divergence

Read this
http://www.pseudonomen.com/lasers/ca...alculator.html
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Old 06-10-2008, 12:38 AM #3
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Default Re: Divergence

Honestly, I don't know a single member of this forum who has the equipment to measure divergence. You can get a rough estimate of it though. Divergence is a measure of how much wider the laser's spot gets over distance, so if you can estimate the spot diameter (which is the diameter in which ~86% of laser power is enclosed) at close range, and far range (ideally 50m+) you can get an idea of your divergence.
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Old 06-10-2008, 02:50 AM #4
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Default Re: Divergence

so according to that calculator...my DX 20mW has a divergence of 0.54mRad?
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Old 06-10-2008, 06:03 AM #5
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Default Re: Divergence

Quote:
Originally Posted by bobobob121
so according to that calculator...my DX 20mW has a divergence of 0.54mRad?
Check your units. Let us know what you're measuring and how because there's definitely something wrong there.
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Old 06-10-2008, 06:31 PM #6
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Default Re: Divergence

im shooting the beam onto a piece of film strip to get rid of most of the static light. I recorded the beam to be 2mm at 1 foot and the beam to be 3mm at 7 feet. i measured it again at a larger distance and got these results... at 1 foot i get 2mm and at 17 i get 10. so the new divergence would be 1.64mRad. what kind of factors would change the divergence of the laser?
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Old 06-10-2008, 07:55 PM #7
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Default Re: Divergence

Quote:
Originally Posted by bobobob121
im shooting the beam onto a piece of film strip to get rid of most of the static light. I recorded the beam to be 2mm at 1 foot and the beam to be 3mm at 7 feet. i measured it again at a larger distance and got these results... at 1 foot i get 2mm and at 17 i get 10. so the new divergence would be 1.64mRad. what kind of factors would change the divergence of the laser?
You are using too short of a distance is why, use a longer distance and see what the divergence is.
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Old 06-10-2008, 09:13 PM #8
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Default Re: Divergence

Quote:
Originally Posted by pseudonomen137
[quote author=bobobob121 link=1213050389/0#3 date=1213062655]so according to that calculator...my DX 20mW has a divergence of 0.54mRad?
Check your units. Let us know what you're measuring and how because there's definitely something wrong there.[/quote]

Well I have had a pulsar which had a divergence of 0.084mRad ; unfortunately, it was defective (you know WL)
Also there is something when mesuring the beam spots diameter, when the outer region is at 20% (or something) of the center's brightness, it shouldn't be counted.

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Old 06-10-2008, 11:41 PM #9
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Default Re: Divergence

What is the typical divergence for a diode dirrect aka 650nm lasers assuming it's focused for the cause? Isn't it like .85mRad?
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Old 06-11-2008, 05:58 AM #10
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Default Re: Divergence

Naaah, you guys aren't measuring far enough. The farther you measure, the closer the estimate you get. If you're measuring <25 feet, you might as well throw a dart at your calendar and proclaim that number your divergence.

50meters is your ideal MINIMUM distance to get any half-decent estimate.

And no, there is no rough divergence for any type or wavelength of laser. The divergence is dependent on your beam diameter. If you have a huge beam diameter, you can have a lower divergence and vice versa.

Quote:
Originally Posted by Helioplasma
[quote author=pseudonomen137 link=1213050389/0#4 date=1213074194][quote author=bobobob121 link=1213050389/0#3 date=1213062655]so according to that calculator...my DX 20mW has a divergence of 0.54mRad?
Check your units. Let us know what you're measuring and how because there's definitely something wrong there.[/quote]


Well I have had a pulsar which had a divergence of 0.084mRad ; unfortunately, it was defective (you know WL)
Also there is something when mesuring the beam spots diameter, when the outer region is at 20% (or something) of the center's brightness, it shouldn't be counted.

[/quote]
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Old 06-11-2008, 01:49 PM #11
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Default Re: Divergence

... I did it at 13,2 meters (about 39.6 feet I think) but my house isn't big enough and there is too many humps in my place to get a accurate mesurement. probably the highest range I could get is around 25 meters.
Now I mesured my (replaced) puslars divergence and is -- 0.94mRad with the same distance from aperture. It may seem more credible for you pseudo...

All right I'll retake the mesurements again when my sister comes.
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95mW infiniti - TO OLD !!! Hardly burns anything without good batteries. But nice as a pointer. Looking at NOVA lasers currently for a fresh new one.
125mW pulsar - Piece of 54!T, doesn't do anything. No burning power at all. But very beautiful as a laser pointer.
191mW ++ IgorT Romisen/CREE laser - This really kills your eyes (without goggles).
170-180mW LikeItBright Ultrafire laser - Works like a flashlight, but a beast up close.
200mW + LCC in police host By Moh. Nice red, and very cheap.
550mW Yobresal "Tiny Laser" - Incredible beam. This specific wavelength isn't really comfortable for the eyes though.
NOIR laser goggles OD 7+ for 180-534 nm Oemlasersystems

Other lasers not worth mentioning
TOTAL AMOUNT SPENT ON LASERS = 1065 $ AT LEAST (not much compared to some other people here...)
Always look on the bright side of lasers ------------------- not literally
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