Laser Blue Violet
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Which one of these lasers is more powerful/longer range?
I want to buy a laser, and the choice has came down to one of these two:
1. Blue-Violet/Royal Purple Laser, 100mW 405nm
2. 200mW Green Laser, Wave Length: 532nm, Class: Class 3B.
Which is more powerful, in terms of burning matches, balloons etc.
and which one has the longest range?
The power is written down there - the green one is twice as powerful as the blue one. If you want one to deliver energy ( ignite ) to a target then the green one is best but its effectiveness depends on how well the radiation is absorbed by the target. Since both radiations are likely to be equally well absorbed then the green one is the way to go.
As for range.... how well are the different photons absorbed by the air? Air does scatter short wavelengths ( blue ) better than longer wavelengths ( green ), indicating that green will have a longer range, but over any sort of reasonable distance ( light a couple of kilometres) I wouldn't have thought there would be a noticeable difference.
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