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Old 01-08-2012, 06:50 PM #1
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Default Collimating lenses.

Well I'm curious. This was my first build, a PHR803t running at 110mA from a linear Mohgasm board, in the classic c6. Thanks Moh. Currently, it is propagating through a stardard Aixiz acrylic lens. Now, I know that glass/coated lenses increase the output power. My question is, is that purely due to the higher transmission of light? Or will I also have a thinner, more tightly collimated beam, causing higher OD?

Also, I'm curious about the lenses in the 532nm DX modules, and o-like modules. Can they be upgraded? Are they worth using?

Thanks guys, open discussion.


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Old 01-08-2012, 07:56 PM #2
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Default Re: Collimating lenses.

When testing with a LPM the beam diameter doesn't matter as long as it is contained within the sensitive area, iirc. So, output power in mW does not depend on energy density in w/cm2 (how thin the beam is).

From that we can deduce that the increased output power recorded with the glass AR coated lenses is from the increased transmission and reduced reflection of the beam.
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Old 01-08-2012, 08:26 PM #3
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Default Re: Collimating lenses.

Why thank you Sigurthr! That answers my question. If I wanted to have a tighter beam, would I need a g-1 or 2? Or would that be the same deal?
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Old 01-08-2012, 08:53 PM #4
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Default Re: Collimating lenses.

The g-1 and g-2 lens give a tighter beam than the aixiz glass 3 element but i dont know if its much different beam specs than the acrylic because they're both single element, maybe a little bettter?
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Old 01-09-2012, 01:14 AM #5
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Default Re: Collimating lenses.

I know output power will be increased by as much as ~30%, but I have no idea on the specifics of the beamspecs the high end lenses produce.

I will say, you can always correct the beam specs later on with additional lenses, so why not start with the best power transmission?

I'll be using a 405-G-2 for my next build.
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Old 01-09-2012, 03:26 AM #6
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Default Re: Collimating lenses.

Quote:
Originally Posted by Sigurthr View Post
I'll be using a 405-G-2 for my next build.
Just got my g-2 from DTR yesterday. 45' balloon pop (end to end of my house) with my 12x @ only 350ma. Great lens
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Old 01-12-2012, 01:22 PM #7
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Default Re: Collimating lenses.

Quote:
Originally Posted by ColdWelder View Post
Well I'm curious. This was my first build, a PHR803t running at 110mA from a linear Mohgasm board, in the classic c6. Thanks Moh. Currently, it is propagating through a stardard Aixiz acrylic lens. Now, I know that glass/coated lenses increase the output power. My question is, is that purely due to the higher transmission of light? Or will I also have a thinner, more tightly collimated beam, causing higher OD?

Also, I'm curious about the lenses in the 532nm DX modules, and o-like modules. Can they be upgraded? Are they worth using?

Thanks guys, open discussion.
Not true about acrylic lenses. They can be just as precise as glass.
Give Edmund Optics a call and request their free catalog. It's chock full of all kinds of info and stuff they you'll find useful Phone: 1-800-363-1992. In the mean time you can look around their site Contact Us - Edmund Optics

Thinner beam can happen but you'll end up with higher divergence.

Yes, you can upgrade, but you'll need to measure the focal length of the original lens. You can do that by using a metric ruler and the lens itself. Remove the lens. Hold the lens with tweezers over something with high contrast like print. Raise the lens up until the image is a large as possible, but still in focus while measuring the height at that point. If the focal length of the original lens is known then then you don't have too measure anything, just find a replacement.
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