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Old 10-26-2010, 11:50 PM #33
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Default Re: How to proof that your 1.5W does not meet the spec if you don't have a LPM

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Originally Posted by oic0 View Post
I wonder if it would be possible to do something like focus the beam out to a VERY specific width at its widest point and then use an IR thermometer to measure how many degrees above room temperature it is able to heat said object. Perhaps a quarter sharpied black?

If you are wanting to go by burning things, I think you are going the wrong direction. A more reliable direction would be to see how wide you can unfocus the beam before there is no interaction. EX: How wide is the beam when it is no longer able to mark a black CD case. At tight focus the dot is too small to accurately make them even and things happen to fast to accurately measure anything other than seat of the pants.
I did that when comparing my arctic to my DIY. Beam wise, outdoors it is VERY hard to differentiate them. I thought perhaps the arctic was the brighter of the two. Then I defocused my DIY to the same width as the arctic and went to town on some CD cases. The arctic takes about 5 seconds to burn through, the DIY about half of the time. Even that is a bad measure though, I should have went wider to get a more accurate reading BUT I didnt want to mess with the focus on the arctic.
What you are referring to is located here....

Simple Laser Power Meter Using IR Thermometer


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Old 10-27-2010, 10:39 PM #34
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Default Re: How to proof that your 1.5W does not meet the spec if you don't have a LPM

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My labby 445 @ 1000mA with Axiz AR glass lens burns the paint right off the wall at 7 meters when focused tight. This only takes a few seconds.

I can also burn a pin hole through 1/2" pine in a few minutes.

My guesstimate of optical power: bloody dangerous.
Id really like to see that. I have a 900mw 445nm and at a distance >5 meters is really hard to burn something because of the laser being a line instead of a dot
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