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Dudeman74
Modified 10mW Greenie
Joined: 05 May 2006
Posts: 12
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 Posted: 6/21/08, 3:25 AM Post subject: Just got a |
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| So I just got a green laser from china it is a <50mw, first of all it was 30 dollars is that a good deal and also after I turn it on for a few seconds the light will dim, it might have old batteries in it so is that the problem? |
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Bluefan
Fusion Laser
Joined: 20 Apr 2008
Posts: 289
Movie(s): 1
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| Posted: 6/21/08, 4:38 AM Post subject: Re: Just g |
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| Dudeman74 wrote: |
| So I just got a green laser from china it is a <50mw, first of all it was 30 dollars is that a good deal and also after I turn it on for a few seconds the light will dim, it might have old batteries in it so is that the problem? |
That first peak may just be the <50mw, and it will dim very fast as the peak voltage of the battery drops to normal levels, and these cheap laser pointers don't have any proper current regulation of the diode, so they drop in power output. New batteries will help, but you always will have a more dimmer beam at the end of the battery and the peak of (hopefully) 50mw will only occur with fresh batteries.
Next, check for an IR filter. If you bought something as cheap as this, you really want to check if there is an IR filter. If there is, you have a slightly more divergent powerfull IR bundle on top of you green. That is, about 2~3x powerfull in a bit bad case. And, IR is practically invisible, so you won't notice being hit until it is really too late. And your laser safety glasses probably won't protect against IR (you do have laser safety glasses, right?). |
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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: 6/22/08, 2:36 AM Post subject: |
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my 50 mw laser from ebay needs to be about 30°C to make a bright beam, try to warm up the laser in your hands for about 1 minute, maybe it is brighter then
_________________
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: 289
Movie(s): 1
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| Posted: 6/22/08, 3:19 PM Post subject: |
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| CrazyKenny wrote: |
| my 50 mw laser from ebay needs to be about 30°C to make a bright beam, try to warm up the laser in your hands for about 1 minute, maybe it is brighter then |
That's quite a crude way to temperature-tune the pump diode  |
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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: 6/22/08, 4:33 PM Post subject: |
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for me it works fine 
_________________
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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Athoul
Wicked Lasers God
Joined: 13 Sep 2005
Posts: 7532
Location: Canada
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