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Old 06-26-2015, 06:49 PM   #2801
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If you just happen to melt a spider you might not mention it to Doug


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Old 06-29-2015, 02:39 PM   #2802
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Smoked out my last couple of aptasias that I could find with the ol' laser this am after a pwc, I know Doug has had very limited success with his laser he bought but this one so far seems to knock em out, Greg has the same laser but thicker and older acrylic and seems to have had some issues with killing aptasias with his , And you're right Greg , it really doesn't waste much time burning up cardboard does it ? It's interesting to see just what and how it performs on different objects,... On Some things there seems to be no effect at all and other objects like cardboard it just goes to town on , rather interesting !


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Old 06-29-2015, 04:03 PM   #2803
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It's the absorption color as much as anything.


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Old 06-29-2015, 07:22 PM   #2804
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So, maybe try a different color? Red?
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Old 06-29-2015, 07:39 PM   #2805
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So, maybe try a different color? Red?

Greg knows a heck of a lot more than us on this subject but will your laser burn paper / cardboard from a couple of feet away ? On mine once I focus the beam down its kinda scary


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Old 06-29-2015, 07:45 PM   #2806
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No, I think blue is still the most effective color. In my case I have enough energy (although those batteries are a joke) but too much beam scattering. It defiantly hurts the anemone, but doesn't fry him at this point. I have a few ideas yet. Haven't tried it after stopping all flow for a few minutes. That might do the trick.


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Old 06-29-2015, 07:49 PM   #2807
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I am trying this with no flow and top down, about 2" from the anemones....not through glass. Not happening for me.
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Old 06-29-2015, 08:00 PM   #2808
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I think the distortion from the water surface layer is worse than thru the glass. Most all of these 2watt and 2.5w blue lasers were designed for blue ray writers/players. That's why the beam starts as a dash instead of a point. You have to pull focus to get a point when close up. That's about as strong as is easily available. The YouTube videos always raised my suspicions as the pests literally exploded when hit. This laser does mess them up, but not destroy them. Again, I am also suspicious that these batteries are garbage. They are junk in flashlights so probably not making enough power in the laser.

I may make a underwater housing with a thin piece of optical glass for the laser to shine thru. That way I could focus within inches.


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Old 06-29-2015, 08:12 PM   #2809
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Quote:
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I am trying this with no flow and top down, about 2" from the anemones....not through glass. Not happening for me.
Quote:
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I think the distortion from the water surface layer is worse than thru the glass.

I may make a underwater housing with a thin piece of optical glass for the laser to shine thru. That way I could focus within inches.


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So what about doing it like X but in a glass(drinking type ) with clearest bottom?
Or a diving mask!!!?
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Old 06-29-2015, 08:15 PM   #2810
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I just burned a hole in a zucchini squash from a couple of feet away .... About two seconds worth of beam on my painted aquarium stand causes it to smoke ... Maybe not all lasers are created equal but I'm convinced that it's focusing that bean that make the difference in performance ... I have had no trouble killing aptasias so far


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