Old 11-13-2015, 04:42 PM #1
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Default LD Emitter Sizes - Please post your LD Data Sheets or findings here!

As I get the information I will be adding posts to this thread giving the emitter sizes of the various laser diodes we use, this info is useful for calculating the expected divergence for a given beam width. Most LD data sheets do not provide this information but as suggested by RedCowboy, using a standard lens for which the divergence with a specific diode is known, we can back calculate the emitter size when taking its focal length into consideration along with the dimensions of the spot the beam produced in inches or preferably in millimeters at a distance.

I'm hoping others will help me gather this information, but many members are not interested in these figures. In any case, I will be adding to this thread as I can. If members have already determined the divergence of their laser pointer diode and could post the type of lens, lens diameter, its focal length (if known) and the size of the spot their laser pointer produces at a measured distance when at infinity focus, this information could also be used to extrapolate the approximate emitter size to add to a document I would like to put together listing as many diodes as I can. If you find the emitter size of any laser diode either through documentation, or other means, please post! If you have links to data sheets or specifications please post those here too.

Thank you to those who help with this, I will +rep you for the info when I can. If I could buy 10 reps to hand out to each member who supplies information I would! If someone has a good procedure to determine the emitter size of a diode or instructions for taking the measurements to determine divergence please share

Here's a link to a page I have been collecting low divergence laser diode data sheets:

http://imageevent.com/qdf_files/tech...iodedatasheets

I will update this first post from time to time with the information I find online, or is provided by members.


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Last edited by Alaskan; 11-13-2015 at 09:20 PM.
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Old 11-13-2015, 06:16 PM #2
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Default Re: LD Emitter Sizes - Please post your LD Data Sheets or findings here!

This is the equation I use to get a rough idea: Emitter size in (mm) = divergence(radians) X focal length of lens (mm)

The divergence is as measured after the collimation lens.

M140 diode for example: .0036rad X 4mm = .0144mm (14.4um)

Last edited by logsquared; 11-13-2015 at 06:46 PM. Reason: goofed example divergence
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Old 11-14-2015, 06:18 PM #3
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Default Re: LD Emitter Sizes - Please post your LD Data Sheets or findings here!

Thanks, I am very interested in knowing the emitter dimensions of the NDG7475 1 watt 520nm green laser diode, I found this data sheet on DTR's web site, but no emitter information

http://photos.imageevent.com/qdf_fil...520nm%201W.pdf
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"I regard consciousness as fundamental. I regard matter as derivative from consciousness..." - Max Planck. "Everything we call real is made of things that cannot be regarded as real" - Neils Bohr. "What we call physical things and events do not exist independently of subjective experience..." - Deepak Chopra.

Each of these three rabbit holes go deep, ending up in the same place.

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Old 11-14-2015, 09:47 PM #4
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Default Re: LD Emitter Sizes - Please post your LD Data Sheets or findings here!

Quote:
Originally Posted by Alaskan View Post
Thanks, I am very interested in knowing the emitter dimensions of the NDG7475 1 watt 520nm green laser diode, I found this data sheet on DTR's web site, but no emitter information

http://photos.imageevent.com/qdf_fil...520nm%201W.pdf
Same as the m140 diodes. ~14um.
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Old 11-14-2015, 10:50 PM #5
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Default Re: LD Emitter Sizes - Please post your LD Data Sheets or findings here!

Based on the divergence of the NDG7475's typical fast and slow axis of 35 & 5 degrees out of the diode prior to collimation, or a ratio of close to 4:1, on average, if that is the fast axis, then the other or slow axis should be about 56um. Concur? I think I'm looking at this correctly but not sure.

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"I regard consciousness as fundamental. I regard matter as derivative from consciousness..." - Max Planck. "Everything we call real is made of things that cannot be regarded as real" - Neils Bohr. "What we call physical things and events do not exist independently of subjective experience..." - Deepak Chopra.

Each of these three rabbit holes go deep, ending up in the same place.

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Last edited by Alaskan; 11-14-2015 at 11:35 PM.
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Old 11-15-2015, 02:28 AM #6
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Default Re: LD Emitter Sizes - Please post your LD Data Sheets or findings here!

Quote:
Originally Posted by Alaskan View Post
Based on the divergence of the NDG7475's typical fast and slow axis of 35 & 5 degrees out of the diode prior to collimation, or a ratio of close to 4:1, on average, if that is the fast axis, then the other or slow axis should be about 56um. Concur? I think I'm looking at this correctly but not sure.

The Fast Axis is actually the smaller dimension of the emitter. So, for the M140 the ~14um dimension is the wider dimension and the Slow Axis. The height is much smaller... around 1 or 2 um. The emitter dimensions can't be calculated from the raw divergence numbers. A known lens is needed to calculate the emitter size. However, the Fast Axis always has the smaller emitter dimension. On some single modes the raw divergence of both axis can be close from what I have seen.

I can't remember what the m140 divergence is after the G2 lens(4mm Fl) in the Fast Axis. I know its about 3.6mrad for the slow axis. That's how I calculated the dimension in above post.
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Old 11-15-2015, 07:03 AM #7
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Default Re: LD Emitter Sizes - Please post your LD Data Sheets or findings here!

My thought was if you knew one dimension; either the slow or the fast axis side, you could then determine the other dimension by the relative differences of the divergence of the other axis.
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To shorten my signature I have moved most of my laser related web links to this forum page, the second post in that thread shows most of my builds... Alaskan's Laser Links: http://laserpointerforums.com/f44/al...ml#post1449395


Sincerely investigate any of these three short quotes as new concepts and you've taken your first step into a larger world:

"I regard consciousness as fundamental. I regard matter as derivative from consciousness..." - Max Planck. "Everything we call real is made of things that cannot be regarded as real" - Neils Bohr. "What we call physical things and events do not exist independently of subjective experience..." - Deepak Chopra.

Each of these three rabbit holes go deep, ending up in the same place.

Useless troll fighting.
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