Old 06-03-2015, 02:23 PM #1
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Default Need thin (fm) but wide beam

I want to make a very, very thin but any width linear polarized laser beam.
The thickness needs to be super small; ideally in the fm scale or less (10^-12 to 10^-20m). Width can be any size.
Prefer any visible frequency, 1mw-250mw power.

Any way to do this?



Last edited by 69911E; 06-03-2015 at 02:33 PM.
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Old 06-03-2015, 03:22 PM #2
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Default Re: Need thin (fm) but wide beam

Quote:
Originally Posted by 69911E View Post
I want to make a very, very thin but any width linear polarized laser beam.
The thickness needs to be super small; ideally in the fm scale or less (10^-12 to 10^-20m). Width can be any size.
Prefer any visible frequency, 1mw-250mw power.

Any way to do this?
Do you mean thin as in flat? like -- instead of o ? What are you trying to achieve?
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Old 06-03-2015, 03:49 PM #3
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Default Re: Need thin (fm) but wide beam

Yes, thin and flat. I do realize it is most likely difficult to maybe impossible at those wavelengths. I could go down to uw power if needed.
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Old 06-03-2015, 04:35 PM #4
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Default Re: Need thin (fm) but wide beam

Quote:
Originally Posted by 69911E View Post
Yes, thin and flat. I do realize it is most likely difficult to maybe impossible at those wavelengths. I could go down to uw power if needed.
I'm not aware of any way to achieve such a thin spot. For example, a 5mm gaussian beam at 450nm going through a lens with a focal length of -1cm will produce a beam waist (Minimum spot size) of ~1.16um - Much larger than you are looking for.

Again, what is it that you are trying to do? One of us may be able to suggest another way to do it.
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Old 06-03-2015, 06:43 PM #5
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Default Re: Need thin (fm) but wide beam

I'm pretty sure you're not going to get that small of a beam - that's smaller than the wavelength of light that you're looking at.
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Old 06-03-2015, 08:32 PM #6
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Default Re: Need thin (fm) but wide beam

I thought a beam size limit near the photons wavelength applies only if an attempt to observe it occurs. , but I am not sure on this...
I will not be making a significant observation to the local region in question.

Last edited by 69911E; 06-03-2015 at 09:05 PM.
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Old 06-03-2015, 09:20 PM #7
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Default Re: Need thin (fm) but wide beam

Why? For what will you be using it?
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Old 06-03-2015, 09:55 PM #8
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Default Re: Need thin (fm) but wide beam

this is only for a wacko experiment. No useful purpose.
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Old 06-04-2015, 09:02 AM #9
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Default Re: Need thin (fm) but wide beam

Quote:
Originally Posted by 69911E View Post
I thought a beam size limit near the photons wavelength applies only if an attempt to observe it occurs. , but I am not sure on this...
I will not be making a significant observation to the local region in question.
No this is not true, there's still a limit to the beam size even if it's not observed. I remember reading something about this regarding lasers used for optical drives, DVDs etc. This minimum size for the beam limits how much data can be stored on a disk. I remember reading that someone recently found a way around the limit by creating a doughnut shaped beam of a different wave length that cancels out part of the beam allowing it to be smaller than the limit and this will lead to the ability to store terabytes of data on one disk.

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Old 06-04-2015, 12:46 PM #10
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Default Re: Need thin (fm) but wide beam

I agree, there is a max data available on any disk, my thought is this refers to an area. I have allowed for a wide in one axis, and narrow in the other; leaving for an overall relatively large area. This approach appears to be consistent with QM, but I am not a theoretical physicist.

Just looking for real world suggestions on how to make it narrow on one axis.
Any suggestions?
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