25mw/80mw 650nm lasers?

   
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sssgood

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January 07, 2012, 08:15 PM

I was just wondering, can we not get higher powered lasers (instead of the 5mw) and increase its distance from the scalp, that way we get more coverage, need fewer lasers, and hence cheaper?

Thanks

 

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Lapwing

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# 1 ]

January 08, 2012, 01:04 AM

Is one 25 mW diode cheaper than five 5 mW diodes?  If not, then it is not cheaper.  Plus fewer diodes, probably implies less consistent overlap regions, which might be an issue.  And also higher power diodes are restricted for human use, ie, there is some restriction for biological use.  Plus more chance for eye injury with higher power lasers.

 

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sssgood

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# 2 ]

January 08, 2012, 12:46 PM

25mw are around $25, if we were to keep it like 5 times the distance from the scalp than a 5mw diode, then we would get significantly more coverage then alot of 5mw diodes, making it cheaper? agreed about the eye injury though.

 

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Lapwing

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# 3 ]

January 08, 2012, 01:38 PM

sssgood,

The formula for power coverage is mW/cm2.  The scalp area (cm2) is constant, so to get the same coverage you need the same total power.  However, you could get the same Joules (energy = Watts x time) by running diodes longer, say 60 minutes instead of 20.  (Ultimately what we want is roughly 5-7 Joules/cm2 deposited per session.)  Then you might be able to reduce your total diode wattage by a 1/3 and save money that way with the 25 mW diodes at a further distance.  So it might be possible to save some money this way, but not much.  Plus you will have much longer sitting times under the helmet.  And this would require a total new helmet design for the longer distances. 

It is definitely feasible, but I really don’t see much benefit.  It looks like a huge hassle, and hey now we can pulse our 5 mW diodes.  More power to you if want to try though.  There is plenty of room for innovation here.

 

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