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Old 07-15-2013, 12:47 AM #1
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Default High Beam Divergence

I recently bought an IR diode with high beam divergence (12 x 28 degrees rectangular). Unfortunately, the module I own has a focal length of about two inches and a lens diameter of 1 inch. This means that about half of the light is not focused and instead scatters around inside the module.

I thought to move the lens closer by cutting off a piece of the heatsink, but that would result in a diverging beam when the diode is closer than the focal length.

To remedy that, can I add another convex lens?

How else can I solve this problem?


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Old 07-15-2013, 01:26 AM #2
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Default Re: High Beam Divergence

Two ways.
1. Replace this lens with a larger diameter longer focal length lens
2. Buy or construct an IR beam expander
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Old 07-16-2013, 12:48 AM #3
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Default Re: High Beam Divergence

Yes, you could add another convex lens. I would put it in a standard module if I were you though. 2 inch focal length is not laser material.
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Old 07-16-2013, 10:14 AM #4
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Default Re: High Beam Divergence

The laserbeam expanders are usually, I think, a convex and a concave lens put together. Since the concave is negative the whole system would be afocal, this is useful esp if you have a high power beam.
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Old 07-16-2013, 01:40 PM #5
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Default Re: High Beam Divergence

Quote:
Originally Posted by BiasP11 View Post
I recently bought an IR diode with high beam divergence (12 x 28 degrees rectangular). Unfortunately, the module I own has a focal length of about two inches and a lens diameter of 1 inch. This means that about half of the light is not focused and instead scatters around inside the module.

I thought to move the lens closer by cutting off a piece of the heatsink, but that would result in a diverging beam when the diode is closer than the focal length.

To remedy that, can I add another convex lens?

How else can I solve this problem?
Can you post some photos of this unit?
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