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Old 03-03-2011, 05:12 AM #1
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Default Optic to turn a laser beam into a wide oval?

Not sure if this is posted in the right section.

I'm looking at the prospects of turning a green laser pointer [~75mw] into a laser level for pavement leveling. Is there a way I can "expand" the laser beam into a wide oval of sorts that can project the laser beam across a flat surface so I can see where the holes needing extra grade are?

The thought of making an optic + laser carrier sounds challenging, but even more challenging is locating a third party optic to defocus lasers into a plane.

Why would I want to do this? Assuming the surface materials contain no reflecting objects, it appeared as an elegant logistics solution for grading areas that need to be not only flat, but level while saving money. Thanks


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Old 03-03-2011, 03:15 PM #2
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Default Re: Optic to turn a laser beam into a wide oval?

Will a laser level work?
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Old 03-03-2011, 05:10 PM #3
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Default Re: Optic to turn a laser beam into a wide oval?

What you need is a 445nm laser. Defocused the spot looks like rounded rectangle.



It would be difficult to mount optics on your laser to create the desired effect.
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Old 03-03-2011, 06:17 PM #4
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Default Re: Optic to turn a laser beam into a wide oval?

Seconded,

I have just been dismantling some greens and discovered that:
1) Adjusting the lens makes very little difference, something like 1'' dot at 10'.
2) The tread used is not 9mm fine, but some variations of "Belgian waffle iron hinge tread".
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Old 03-03-2011, 08:54 PM #5
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Default Re: Optic to turn a laser beam into a wide oval?

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Originally Posted by Cyparagon View Post
Will a laser level work?
Sure it would, but my usage does not justify its investment. I was merely attempting to use my newly acquired Opto-75 on other constructive uses when I'm not pointing at stars

Tech_Junkie, so this is more of a wavelength issue? Given the information on this forum with regards to 445nm lasers tends to shift towards burning stuff, if I was to use it to grade an outdoor surface where long grass may encroach is vicinity...it would seem somewhat hazardous.
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Old 03-03-2011, 11:33 PM #6
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Default Re: Optic to turn a laser beam into a wide oval?

Quote:
Originally Posted by Illuminum3415 View Post
Not sure if this is posted in the right section.

I'm looking at the prospects of turning a green laser pointer [~75mw] into a laser level for pavement leveling. Is there a way I can "expand" the laser beam into a wide oval of sorts that can project the laser beam across a flat surface so I can see where the holes needing extra grade are?

The thought of making an optic + laser carrier sounds challenging, but even more challenging is locating a third party optic to defocus lasers into a plane.

Why would I want to do this? Assuming the surface materials contain no reflecting objects, it appeared as an elegant logistics solution for grading areas that need to be not only flat, but level while saving money. Thanks
An anamorphic lens should do the trick and yes you've posted in the right section. Scratch that. What you need is a cylindrical lens or rod lens

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Old 03-04-2011, 12:54 AM #7
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Default Re: Optic to turn a laser beam into a wide oval?

Some vendors have red modules which produce a line. It has a type of rod lens as steve mentioned. You might be able to add that little lens to your green or simply find a small glass rod to glue in front of the beam.

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Old 03-04-2011, 02:56 AM #8
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Default Re: Optic to turn a laser beam into a wide oval?

Aixiz has a few different angles of line-generating optics for $5 shipped.
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Old 03-04-2011, 03:06 AM #9
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Default Re: Optic to turn a laser beam into a wide oval?

I would not use a Green laser for the purpose you want it for. If you drop it bump it etc against anything you will most likely damage the Aliment of the Crystal, Kill the diode etc.

I would stick with a Red laser or since your looking for an oval like shape i would go with what TJ said.

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Old 03-04-2011, 05:36 AM #10
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Default Re: Optic to turn a laser beam into a wide oval?

A better solution is to get a motor with a hex mirror and have it generate the line that way. That way you get a line that is the same size regardless of the lens, and don't need weird optics.

You can find such motors/hex mirrors in laser printers and such, but an easier way to get them is at a surplus place like surplus shed. Here's one for $10. The pin-out for the motor can be found here.
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Old 03-04-2011, 10:00 AM #11
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Default Re: Optic to turn a laser beam into a wide oval?

Quote:
Originally Posted by Illuminum3415 View Post
STech_Junkie, so this is more of a wavelength issue? Given the information on this forum with regards to 445nm lasers tends to shift towards burning stuff, if I was to use it to grade an outdoor surface where long grass may encroach is vicinity...it would seem somewhat hazardous.
Its actually the diode, not wavelength. 445nm diodes are multimode, so they do not produce a round dot. You can get red too, but it wont be as bright as the blue. Also the laser is defocused so no issues of burning things. To burn you need to focus it in a tight dot.

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TJ, Welcome back. Did you ever get a chance to read my PM a wail back buddy.
Thanks man. I dont think I got it, because there is nothing in my inbox.
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Old 03-04-2011, 10:15 AM #12
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Default Re: Optic to turn a laser beam into a wide oval?

Yeah, I think the Aixis $5.00 solution that was mentioned is probably your cheapest/easiest way to get what you want. I have been happy with the line generator optics for red that I purchased from them.

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Old 03-04-2011, 11:43 AM #13
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Default Re: Optic to turn a laser beam into a wide oval?

If you want a line generating lens, cannibalizing this might be the cheapest way to go.
$3.96 - Red Laser Module - Focused Line (3.5V~4.5V 16mm 5mW) - Red Lasers
Now making an oval?
You'd be better off with motors and mirrors.
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Old 03-04-2011, 12:56 PM #14
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Default Re: Optic to turn a laser beam into a wide oval?

I do have access to small glass rods, but they are tubular rather than solid. Something also tells me a decent pair of safety glasses is warranted beyond this point
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