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CrazyKenny
Elite Laser
Joined: 03 May 2007
Posts: 146
Picture(s): 3
Movie(s): 1
Location: Germany
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 Posted: 7/02/08, 3:20 AM Post subject: thinner be |
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Hi,
Is it possible to lower the beam diameter? because my laser module (532nm, 300mw) has a beam diameter of ~3 mm at aperture and a divergence of about 2-3 mRad... bad beam specs... it can't even light a unaided match unfocused. It is powerfull because compared to my fusion it is much brighter. But the beam is too thick, is it possible to lower the diameter? If yes, how do I do it?
Here a picture, Fusion vs. laser module:
thxs 4 answers
_________________
green 3~8mw ebay laser
green 50mw ebay laser (mounted on telescope)
homemade DVD-Burner Laser (~120mW, divergence: 0.05 !)
RGY laserscanner (130mW red 60mW green) 
300mW green Laser module from ebay 
money spent on lasers: ~1800 $ (some are broken...) |
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Bluefan
Fusion Laser
Joined: 20 Apr 2008
Posts: 299
Movie(s): 1
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| Posted: 7/02/08, 5:36 AM Post subject: |
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| If you get a beam expander and put in reverse in your beam, it should become much thinner. 2~3 mrad is a bit much, is the module properly focussed at infinity? |
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Vic
Wicked Lasers God
Joined: 30 Oct 2006
Posts: 2006
Picture(s): 66
Movie(s): 3
Location: United States, CA, Los Angeles
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CrazyKenny
Elite Laser
Joined: 03 May 2007
Posts: 146
Picture(s): 3
Movie(s): 1
Location: Germany
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| Posted: 7/03/08, 7:50 AM Post subject: |
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from ebay ^^
it has an IR filter, and it's much stronger than my fusion, the only bad thing is the divergence and the beam diameter
_________________
green 3~8mw ebay laser
green 50mw ebay laser (mounted on telescope)
homemade DVD-Burner Laser (~120mW, divergence: 0.05 !)
RGY laserscanner (130mW red 60mW green)
300mW green Laser module from ebay
money spent on lasers: ~1800 $ (some are broken...) |
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| Back to top |
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incinerator
Elite Laser
Joined: 05 Aug 2007
Posts: 207
Location: canada
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| Posted: 7/18/08, 8:04 PM Post subject: |
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| CrazyKenny wrote: |
from ebay ^^
it has an IR filter, and it's much stronger than my fusion, the only bad thing is the divergence and the beam diameter |
This is typical for a high powered lab laser... one thing you can do is to use a convex lens to focus the beam then, right before the focal length, put a concave lens to expand the shrinking laser beam. (It's called a collimator) And you get a collimated laser beam, but the real challenge is putting the lenses in the right place 
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resistance is futile (if <1 ohm)
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Motocrossboy69
25mW Classic Wicked Laser
Joined: 16 Jul 2008
Posts: 30
Location: surrey
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| Posted: 7/19/08, 3:59 PM Post subject: |
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| Yeah thats what im trying at the moment? Just dont know were to get a concave lens. im still a bit confused on how to make it. It is on the project section |
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