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power consumption for a given brightness

BKarim

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let's consider a DPSS 532nm pointer and a 650nm diode pointer.
to achieve the same dot brightness (not output power!), which pointer will consume the less battery power ? (or current if you prefer)
 

Rafa

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hmm I think red will consume a lot more than the pump diode of the greenie.

But it depends on the green's efficience and the red's efficience.
 

Cyparagon

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In theory, you'd need about 14 times the red power (658nm) to equal the brightness of the green. An input of 1W of energy into a green laser yields 100mW (obviously dependent on many parameters) while 1W power input to a red laser diode will give about 350mW. So you'd need 3.8 W input to a red laser to yield the same brightness.

(Disclaimer: theory ≠ practice)
 

Cyparagon

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I have. Typical 100mW greens use 1/2W diodes. They generally run about 500mA at 2V (1W input)
 

BKarim

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i'm amazed. are you sure that overall efficiency for 532nm generation is 10% which is very good.


so, same question for 405nm:
to achieve the same dot brightness (not output power!), which pointer will consume the less battery power ?
(and if you can same question for beam visibility :) )
 
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