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Old 10-06-2010, 02:04 PM #1
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Default how to... reduce the mRAD of a laser?

need a smaller mrad, a better collimation. is there lens that can do this for me? for sell? :P


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Old 10-06-2010, 02:15 PM #2
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Default Re: how to... reduce the mRAD of a laser?

Quote:
Originally Posted by Leodahsan View Post
need a smaller mrad, a better collimation. is there lens that can do this for me? for sell? :P
Translated:
I need a smaller beam divergence on my laser. Is there a lens that can do this for me that is available for sale.

Answer:
Laser Beam Expander :: Precision Optics :: Dragon Lasers
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Old 10-06-2010, 02:42 PM #3
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Default Re: how to... reduce the mRAD of a laser?

thanks for translating! i'm not english.
so, is this that i'm looking for, but it is very expensive and will be hard to fit one of these in a aixiz module.
maybe someone at the LPF could machine one look alike with 445nm and sell cheaper than 80 bucks? :S they would sell very well in here...
thanks
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Old 10-06-2010, 02:46 PM #4
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Default Re: how to... reduce the mRAD of a laser?

Well you are looking for precision optics. Anything thing with "precision" in it's name is going to be expensive.

So you want a custom beam expander (well reducer in this case) for less than $80?
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Old 10-06-2010, 02:52 PM #5
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Default Re: how to... reduce the mRAD of a laser?

Quote:
Originally Posted by udanis View Post
Well you are looking for precision optics. Anything thing with "precision" in it's name is going to be expensive.

So you want a custom beam expander (well reducer in this case) for less than $80?
Hi udanis,
No he doesn't need a beam reducer, it's a beam expander. The beam expander will expand ie increase the beam diameter, but also reduce divergence by the same X factor.
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Old 10-06-2010, 03:03 PM #6
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Default Re: how to... reduce the mRAD of a laser?

Quote:
Originally Posted by bootleg2go View Post
Hi udanis,
No he doesn't need a beam reducer, it's a beam expander. The beam expander will expand ie increase the beam diameter, but also reduce divergence by the same X factor.
Okay beam expander to reduce the diameter of the beam :P
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Old 10-06-2010, 03:17 PM #7
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Default Re: how to... reduce the mRAD of a laser?

yeah, I think a custom beam expander that fits an aixiz module cheaper than 80 bucks.
well.. if it is more expensive than 50 bucks i'll only buy it on december. lol
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Old 10-06-2010, 03:37 PM #8
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Default Re: how to... reduce the mRAD of a laser?

Quote:
Originally Posted by udanis View Post
Okay beam expander to reduce the diameter of the beam :P
Hi udanis,
No, a beam expander increases the diameter of the beam, while at the same time reduces the divergence.

Divergence is how much the beam spreads out and it's inversely proportional to the diameter of the beam.
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Old 10-06-2010, 03:45 PM #9
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Default Re: how to... reduce the mRAD of a laser?

Quote:
Originally Posted by bootleg2go View Post
Hi udanis,
No, a beam expander increases the diameter of the beam, while at the same time reduces the divergence.

Divergence is how much the beam spreads out and it's inversely proportional to the diameter of the beam.
Oops my bad. Should of googled that a bit more
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Old 10-08-2010, 12:44 PM #10
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Default Re: how to... reduce the mRAD of a laser?

How come beam expanders aren't being used on the majority of the lasers here on LPF? I mean if they work on most lasers, it would be very useful in order to reduce the laser's divergence especially in the case of 445 nm lasers such as the spartan, on which the dragon lasers' beam expander can be installed.
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Old 10-08-2010, 01:09 PM #11
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Default Re: how to... reduce the mRAD of a laser?

because most people don't want a larger beam to gain better divergence. I think....bootleg2go?
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Old 10-08-2010, 10:59 PM #12
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Default Re: how to... reduce the mRAD of a laser?

It depends on the application.

For example, lets assume a 1.5mrad beam with 3mm diameter at aperture. At 10 meters the dot/beam will be 15mm in diameter. At 100 meters the dot/beam will be 150mm in diameter.

Now put that same laser through a 10X expander and you will have a 30mm beam at aperture with only 0.15mrad divergence. So at 10 meters the dot/beam will be 31.5mm in diameter. But @ 100 meters the dot/beam will be 45mm in diameter... less than HALF the size of the unmodified laser beam. This means energy density and intensity are MUCH greater at longer distances.

There's a balance point for deciding if a beam expander is helping or hurting your beam charactaristics. In the above example, the distance is 20 meters. At 20 meters, the beams above would project the same dot size. Less than 20 meters and the unmodified beam would project a tighter beam/dot. Greater than 20 meters and the "expanded" beam would project a tighter beam/dot.

The reason most people don't bother with beam expanders is the expense and lack of need to point at "long distances". Most people here are calibrating projectors for certain distances, using laser pointers at room distances, or burning things. How many people here really care about beam profile & dot further than we can accurately perceive it or burning at long distances?

This is an illustratoin of what I'm talking about (regular beam vs 10X expanded beam):
|x|= intersection point in meters
Theta = milliradians
D = aperture diameter in millimeters

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Old 10-08-2010, 11:36 PM #13
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Default Re: how to... reduce the mRAD of a laser?

Great explanation, this would be an answer given from experience
and not regurgitation of a google result...



+1




Quote:
Originally Posted by LazyBeam View Post
It depends on the application.

For example, lets assume a 1.5mrad beam with 3mm diameter at aperture. At 10 meters the dot/beam will be 15mm in diameter. At 100 meters the dot/beam will be 150mm in diameter.

Now put that same laser through a 10X expander and you will have a 30mm beam at aperture with only 0.15mrad divergence. So at 10 meters the dot/beam will be 31.5mm in diameter. But @ 100 meters the dot/beam will be 45mm in diameter... less than HALF the size of the unmodified laser beam. This means energy density and intensity are MUCH greater at longer distances.

There's a balance point for deciding if a beam expander is helping or hurting your beam charactaristics. In the above example, the distance is 20 meters. At 20 meters, the beams above would project the same dot size. Less than 20 meters and the unmodified beam would project a tighter beam/dot. Greater than 20 meters and the "expanded" beam would project a tighter beam/dot.

The reason most people don't bother with beam expanders is the expense and lack of need to point at "long distances". Most people here are calibrating projectors for certain distances, using laser pointers at room distances, or burning things. How many people here really care about beam profile & dot further than we can accurately perceive it or burning at long distances?

This is an illustratoin of what I'm talking about (regular beam vs 10X expanded beam):

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Old 11-28-2010, 01:47 PM #14
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Default Re: how to... reduce the mRAD of a laser?

I wish this forum suported TeX

z_0 is called the Rayleigh range and is an intrinsic property of a laser. It tells you the distance the beam will travel from the location of the beam waist (the narrowest part of the beam) before the width of the beam will be Sqrt(2) or 1.414 times the width at the waist.
Alternatively you can think of the Rayleigh range as the distance the beam will travel from the location of the beam waist before the cross sectional area of the beam is 2x (not Sqrt(2)) the cross sectional area at the beam waist.

More in depth here because I can't write neat looking equations here Rayleigh length - Wikipedia, the free encyclopedia
Basically you want to use a short wavelength (blue is good so you don't need to worry about that) and a large beam waist. So like people said, get or make a beam expander.

I wouldn't worry about it unless you intend to point down the street with little divergence, or measure the distance to the moon :P

That said, I'd like a wide ish beam too. probably 5mm in width. Too bad I can't make it a clean Gaussian without some seriously expensive equipment lol.
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Old 11-28-2010, 07:03 PM #15
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Default Re: how to... reduce the mRAD of a laser?

that Dragon lasers Beam Expander says that

Quote:
Originally Posted by Dragonlasers
The beam expander can be connected to our Viper, Aurora and Spartan Series lasers using optional adapters.
Are there any companies that manufacture beam expanders for a custom size? Or do you have to get a tripod or two or set up an optics table if you don't have one of "their" lasers?
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Old 11-28-2010, 07:37 PM #16
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Default Re: how to... reduce the mRAD of a laser?

Quote:
Originally Posted by bootleg2go View Post
Hi udanis,

Divergence is how much the beam spreads out and it's inversely proportional to the diameter of the beam.
This is true in real world. I have a green laser with a thick beam at the output, 5/6mm I think, but it is the only laser that can project a bright dot in the clouds. The ones with much smaller beams around 1mm never did this no matter how good I collimate it.
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405nm 400mW S06J C6
445nm 3W Big Boy, 2.8W Dominator, 2.4W Steel Laser
450nm 240mW PL450 C6
473nm 100mW PGL-III-C-473
520nm 55mW Skylaser PL520
532nm 821mW Skylaser PL532, 133mW Jetlasers Ti-B
589nm 100mW PGL-III-C-589
635nm 70mW Sanyo SenTorch
638nm 175mW Ehgemus, 1W Rook
660nm 1216mW Skylaser PL660, 263mW LPC826 C6
685nm 33mW Fujitsu FLD6A2TK C6
780nm 150mW Dilda
808nm 640mW C6

I have copper 501B and Dominator lasers for sale !
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