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ihavea55mw
Nexus Laser
Joined: 16 Apr 2006
Posts: 100
Location: sydney, australia
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 Posted: 6/14/08, 3:05 AM Post subject: I broke th |
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I was screwing around with my laser the other day and I broke mr driver pcb on my 55mw old style wicked laser. I can make another one but I have no idea what current I should drive the laser with.
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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: 6/15/08, 12:01 PM Post subject: |
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Google says about 2.0 Volts...
Try it ^^
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green 50mw ebay laser (mounted on telescope)
homemade DVD-Burner Laser (~120mW, divergence: 0.05 !)
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300mW green Laser module from ebay 
money spent on lasers: ~1800 $ (some are broken...) |
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Bluefan
Elite Laser
Joined: 20 Apr 2008
Posts: 244
Movie(s): 1
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| Posted: 6/15/08, 12:06 PM Post subject: |
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| CrazyKenny wrote: |
Google says about 2.0 Volts...
Try it ^^ |
Laser diodes should be current driven, and the current is not an exact number for all diodes. You could ask wicked lasers if they know what current the diodes needs. |
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cornman
4.99mW Green Laser Toy
Joined: 03 Aug 2008
Posts: 9
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| Posted: 8/10/08, 11:02 PM Post subject: |
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| What does it mean if the diode is current driven? It doesn't mean that the voltage doesn't matter so what else could it mean? |
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myslinky
Fusion Laser
Joined: 01 Jan 2008
Posts: 265
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| Posted: 8/10/08, 11:04 PM Post subject: |
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| Shouldn't it be 3V since you are using 2 AAA batteries? Don't take my word for it though, I could be wrong... |
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iVO
Phoenix Laser
Joined: 23 Feb 2008
Posts: 75
Location: USA
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| Posted: 8/10/08, 11:36 PM Post subject: |
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| Directly connecting the voltage of 2 AAA batteries would fry the laser after about 10 sec. of use. It is not the voltage, but the amperage that fries the diode. The driver needs to mostly regulate amperage to the diode. However, to prevent any type of voltage spike, you also need a voltage regulator on the driver. |
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styro
Modified 10mW Greenie
Joined: 31 Jul 2008
Posts: 15
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| Posted: 8/12/08, 7:48 AM Post subject: |
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| Voltage really has almost no effect on these laser diodes. You could hit that laser diode with 100V as long as you kept the current at the right level. |
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Bluefan
Elite Laser
Joined: 20 Apr 2008
Posts: 244
Movie(s): 1
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| Posted: 8/13/08, 2:12 AM Post subject: |
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That would be friggin impossible. At 100v, some kiloamps will go through the diode, if the powersupply could give that. The point is, a fixed current is the best way because the voltage will vary even with a constant current. And since U=I*R, voltage and current aren't that free from eachother. But, a laserdiode just hasn't got a neat R defined, which is why it can be properly fed with just a constant current. Expensive laser diode drivers also have a fixed power option (U*I = constant).
Note that even a fixed current can blow up your diode. Efficiency goes down with a raised temperature, so if you have a current which works for the operating temperature, it may fry the diode on room temperature. So, photodiode feedback can compensate for this, giving a fixed output. but the high power laser pump diodes don't have a photodiode, mostly because higher power diodes have a wider current range between threshold and blown-up level and thus don't need the feedback to save the diode. |
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