Welcome to Laser Pointer Forums! If you are looking for a laser you may want to check out the Laser Company Top Sites List. The link will open in a new window for your convenience.

Laser Pointer Store
 Laser Pointers Divergence
 User Name Remember Me? Password

LPF Laser Pointer Company Database (link opens new window)

06-09-2008, 10:26 PM #1
 Junior Member Join Date: Jun 2008 Posts: 13 Rep Power: 0
JerzyDevil
Junior Member

Join Date: Jun 2008
Posts: 13
Rep Power: 0
Divergence

How is divergence measured?

06-09-2008, 10:43 PM #2
 Class 3B Laser Join Date: Mar 2006 Location: Utah Posts: 4,496 Rep Power: 2425488
Razako
Class 3B Laser

Join Date: Mar 2006
Location: Utah
Posts: 4,496
Rep Power: 2425488
Re: Divergence

__________________

06-09-2008, 11:38 PM #3
 Class 3R Laser Join Date: Oct 2006 Posts: 2,032 Rep Power: 32
pseudonomen137
Class 3R Laser

Join Date: Oct 2006
Posts: 2,032
Rep Power: 32
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.

06-10-2008, 01:50 AM #4
 Class 2M Laser Join Date: Feb 2008 Posts: 728 Rep Power: 13
bobobob121
Class 2M Laser

Join Date: Feb 2008
Posts: 728
Rep Power: 13
Re: Divergence

so according to that calculator...my DX 20mW has a divergence of 0.54mRad?
__________________
Ahh lets all freak out about IR!!

06-10-2008, 05:03 AM #5
 Class 3R Laser Join Date: Oct 2006 Posts: 2,032 Rep Power: 32
pseudonomen137
Class 3R Laser

Join Date: Oct 2006
Posts: 2,032
Rep Power: 32
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.

06-10-2008, 05:31 PM #6
 Class 2M Laser Join Date: Feb 2008 Posts: 728 Rep Power: 13
bobobob121
Class 2M Laser

Join Date: Feb 2008
Posts: 728
Rep Power: 13
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?
__________________
Ahh lets all freak out about IR!!

06-10-2008, 06:55 PM #7
 Class 4 Laser Join Date: Jun 2007 Location: Carbondale, IL Posts: 5,385 Rep Power: 2061871
styropyro
Class 4 Laser

Join Date: Jun 2007
Location: Carbondale, IL
Posts: 5,385
Rep Power: 2061871
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.
__________________

Always protect your seeing balls!

06-10-2008, 08:13 PM #8
 Class 2M Laser Join Date: Nov 2007 Location: United Kingdom Posts: 529 Rep Power: 33
Helioplasma
Class 2M Laser

Join Date: Nov 2007
Location: United Kingdom
Posts: 529
Rep Power: 33
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.

__________________
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

06-10-2008, 10:41 PM #9
 Class 3R Laser Join Date: Feb 2008 Posts: 1,781 Rep Power: 118
Ace82
Class 3R Laser

Join Date: Feb 2008
Posts: 1,781
Rep Power: 118
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?

06-11-2008, 04:58 AM #10
 Class 3R Laser Join Date: Oct 2006 Posts: 2,032 Rep Power: 32
pseudonomen137
Class 3R Laser

Join Date: Oct 2006
Posts: 2,032
Rep Power: 32
Re: Divergence

Naaah, you guys aren't measuring far enough. The farther you measure, the closer the estimate you get. If you're measuring &lt;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]

06-11-2008, 12:49 PM #11
 Class 2M Laser Join Date: Nov 2007 Location: United Kingdom Posts: 529 Rep Power: 33
Helioplasma
Class 2M Laser

Join Date: Nov 2007
Location: United Kingdom
Posts: 529
Rep Power: 33
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.
__________________
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

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

All times are GMT. The time now is 07:16 PM.

 -- DarkShadows V5 -- Responsive LPF -2562016 -- Default Style Contact Us - Laser Pointers - Archive - Top