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Old 06-05-2016, 06:22 PM #17
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Default Re: Lens surface accuracy question; 1/2, 1/4 or 1/10 wavelength?

Here's a lens with a very long focal length
150MM DIAMETER F/17 PCX LENS 2600MM FL - Surplus Shed

Even longer.
http://www.surplusshed.com/pages/item/l3919d.html



Last edited by steve001; 06-05-2016 at 06:23 PM.
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Old 06-06-2016, 02:50 AM #18
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Default Re: Lens surface accuracy question; 1/2, 1/4 or 1/10 wavelength?

I came across that one searching Google too, but its focal length is too long for what I use, that and it is 6" diameter, I have lots of lenses that diameter and larger. I was hoping to find like 18-24 inch diameter PCX lens I could afford, but the only ones I can afford are at 2 lambda surface accuracy, while that will work, the tolerance is a bit loose, that and heavy as hell.

I've started looking at Dobsonian mirrors, they are far less expensive, lighter, and from what Planters recently told me the tolerances are much better. I'm thinking the cheapest way to achieve ultra low divergence is to buy a used Dobsonian telescope and shoot a laser into its eye piece, might need something changed at the eye piece, but other than that they appear to be plug and play for this use, if there is enough range of focus. I still need to research more on this.

I think it would be a hoot to have a 16 inch Dobsonian telescope to put a spot on a cloud with. If using a low power PL520 diode the beam would probably be difficult to see, but the spot so concentrated on a 5,000 foot high cloud base it would get some folk scratching their heads. That and I've always wanted a good telescope, as long as I don't damage it with a laser it will be a win-win to get one.
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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.

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Old 06-06-2016, 01:03 PM #19
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steve001 steve001 is offline
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steve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond repute
Default Re: Lens surface accuracy question; 1/2, 1/4 or 1/10 wavelength?

Quote:
Originally Posted by Alaskan View Post
I came across that one searching Google too, but its focal length is too long for what I use, that and it is 6" diameter, I have lots of lenses that diameter and larger. I was hoping to find like 18-24 inch diameter PCX lens I could afford, but the only ones I can afford are at 2 lambda surface accuracy, while that will work, the tolerance is a bit loose, that and heavy as hell.

I've started looking at Dobsonian mirrors, they are far less expensive, lighter, and from what Planters recently told me the tolerances are much better. I'm thinking the cheapest way to achieve ultra low divergence is to buy a used Dobsonian telescope and shoot a laser into its eye piece, might need something changed at the eye piece, but other than that they appear to be plug and play for this use, if there is enough range of focus. I still need to research more on this.

I think it would be a hoot to have a 16 inch Dobsonian telescope to put a spot on a cloud with. If using a low power PL520 diode the beam would probably be difficult to see, but the spot so concentrated on a 5,000 foot high cloud base it would get some folk scratching their heads. That and I've always wanted a good telescope, as long as I don't damage it with a laser it will be a win-win to get one.
Using the second lens link this is what I got https://lightmachinery.com/optical-d...IUKN9KD7m14kjw This 160,000,000.0mm converted to miles is 99.4 with a spot size of 40cm or 1.5748 at that distance
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Old 06-07-2016, 06:46 AM #20
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Default Re: Lens surface accuracy question; 1/2, 1/4 or 1/10 wavelength?

Something isn't right in the setup of that online graphical calculator, if I see what I think I see.
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Laser Safety: http://www.laserpointersafety.com/index.html

Sam's Laser FAQ: Sam's Laser FAQ: Welcome Page

RHD's Relative Perceived Brightness Calculator. Compare brightness @nm: http://lsrtools.1apps.com/relativebrightness

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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Old 06-07-2016, 11:49 AM #21
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steve001 steve001 is offline
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Default Re: Lens surface accuracy question; 1/2, 1/4 or 1/10 wavelength?

Quote:
Originally Posted by Alaskan View Post
Something isn't right in the setup of that online graphical calculator, if I see what I think I see.
Maybe. Try the archived app.. gausian beam rev 2.0.xls
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