High powered host with long duty cycles

andyman · Apr 23, 2014

I've built a couple host now for killing pest in my fish tank using 2.4W lasers and what I'm finding is that the pest have deep tissue layers. I can burn off the top but I just don't have enough power to burn off lower layers. They keep regenerating! So what I need is more power. Does anyone on this board sell 3 - 4 diode lasers with active cooling? I assume knife edge? Looking for 8-10watts portable. Need duty cycles in the 5 minute range or longer.

andy

Teej · Apr 23, 2014

andyman said:
I've built a couple host now for killing pest in my fish tank using 2.4W lasers and what I'm finding is that the pest have deep tissue layers. I can burn off the top but I just don't have enough power to burn off lower layers. They keep regenerating! So what I need is more power. Does anyone on this board sell 3 - 4 diode lasers with active cooling? I assume knife edge? Looking for 8-10watts portable. Need duty cycles in the 5 minute range or longer.

andy

Could you just make what you have more water resistant, and cut the distances to the targets?

For example, if you had a deep enough cup (I don't know your tank set-up/size etc...), you could attach the laser to the inside of the cup (Where its inside bottom is normally...), and invert it, so that the cup traps the air around the laser, and, can then be submerged with the laser, bring the business end of the laser closer to the targets.

An inverted rubber glove, or any other variation on the theme, would work, and perhaps add to the ease of operation.

And so forth, any way to get the laser closer would address the current distance attenuation you now have....and increase your power on target without buying new equipment.

andyman · Apr 23, 2014

I've already built a waterproof laser. Problem is there are certain spots I can't get to due to length of the laser. Also I get pretty lazy and a lot of times I prefer to zap them during commercials when watching tv. It would just be nice to have a super high powered laser for this. So where does one buy such a tool?

http://laserpointerforums.com/f65/waterproof-laser-reef-application-87730.html

Teej · Apr 24, 2014

andyman said:
I've already built a waterproof laser. Problem is there are certain spots I can't get to due to length of the laser. Also I get pretty lazy and a lot of times I prefer to zap them during commercials when watching tv. It would just be nice to have a super high powered laser for this. So where does one buy such a tool?

http://laserpointerforums.com/f65/waterproof-laser-reef-application-87730.html

OK, how long is too long to be able to hit what you need to hit?

(If I understand you, your current laser is too long, and can't fit/allow angles needed in tank to aim at some targets of concern)

There's a newer 5 w 445 nm diode out, which could probably be as pushed as hard he others typically end up, which could more than double your power...but its ~ $ 500 or so just for the diode.

It sounds like you use it in the water, which I have not tested as far as cooling, but, doesn't that increase the duty cycle? Enough?

Cel · Apr 24, 2014

Why not use IR laser diode?

Teej · Apr 24, 2014

Cel said:
Why not use IR laser diode?

I think vis light passes through water with less attenuation per distance than IR though.

Cel · Apr 24, 2014

But IR (808nm) will be much more powerful and cheaper.

Teej · Apr 24, 2014

Cel said:
But IR (808nm) will be much more powerful and cheaper.

But would it be more powerful by the time it gets through the water, if that wavelength can't penetrate water well?

That is part of the equation for use in a fish tank.

Cel · Apr 24, 2014

Why not just use mechanical means for that purpose?

Teej · Apr 24, 2014

Cel said:
Why not just use mechanical means for that purpose?

LOL

Its a LASER FORUM!

I also off road, and, some get it, and some don't.

A buddy brought a spouse on a trip to an off road park with us, and there were some decent boulders on the trail, the kind we want to crawl over for fun...its part of the hobby, etc...

And we start spotting him over the rocks, and its a bit technical, with a few repositionings to get the line to work, etc, and his wife pipes up "Why don't you just go around them?"

He looks at her, and says "I didn't drive 2 and a 1/2 hours to get here and go AROUND the damn rocks!"

Cyparagon · Apr 24, 2014

Cel said:
Why not use IR laser diode?

Near IR has very low absorption for most biological matter. I've put my hand in the beam of a 40W diode and only felt a slight warmth.

Cel · Apr 24, 2014

Cyparagon said:
Near IR has very low absorption for most biological matter. I've put my hand in the beam of a 40W diode and only felt a slight warmth.

Really? Interesting...
More experiments should be made.

andyman · Apr 25, 2014

5w diode? I'll have to check DTR but what would be ideal is 2 5W diodes !! I want 10W+

But I'll settle for 7 or 8. To be honest I don't know how much I need, I just want as much as I can get with long duty cycles. Basically I don't want to have to worry about burning out the laser because I left it on too long or forgot to cool it down enough. What I generally do now is zap these pest until I see them melt. Problem is most of them just ball up and let the outer skin absorb all the punishment. The lasers not enough to penetrate deeper into the tissue. So they recover and whats worst is babies pop out.

I am doing both lasers and mechanical means of removal. I've even resorted to biological means with natural predation. So what I'm asking from the forum is for solutions with high power laser, not alternative solutions. I'll need something that is not submerged either.

Is everyone here simply just running 1 diode lasers?

andyman · Apr 25, 2014

Oh just saw the NDB7A75 on DTR's. 5W is nice. Anybody use those? I can definitly just swap this diode into my maglight build. But what I noticed is , how does one supply 4.4A @ 4.7V to this? Don't see any drivers that can go up that high. And the divergence looks pretty wide.

Teej · Apr 25, 2014

andyman said:
5w diode? I'll have to check DTR but what would be ideal is 2 5W diodes !! I want 10W+

But I'll settle for 7 or 8. To be honest I don't know how much I need, I just want as much as I can get with long duty cycles. Basically I don't want to have to worry about burning out the laser because I left it on too long or forgot to cool it down enough. What I generally do now is zap these pest until I see them melt. Problem is most of them just ball up and let the outer skin absorb all the punishment. The lasers not enough to penetrate deeper into the tissue. So they recover and whats worst is babies pop out.

I am doing both lasers and mechanical means of removal. I've even resorted to biological means with natural predation. So what I'm asking from the forum is for solutions with high power laser, not alternative solutions. I'll need something that is not submerged either.

Is everyone here simply just running 1 diode lasers?

I don't have a fish tank, and when I did, I didn't lase the pests.

It does sound more fun though.

Water attenuates the power, so the dose is greatly reduced, and the more depth it has to get through to hit the pest, the less is left to kill it.

What the heck ARE these things you are trying to kill, anyway?

Are they the kind of thing that is constantly reintroduced to your tank, or, something that got in there, and now you can't get rid of it...but if you did, the problem would be solved?

What are they exactly?

sellersmd · Apr 25, 2014

I'm guessing they are aiptasia anemones. They hitchhike their way into saltwater tanks via purchased rocks and corals and reproduce readily. I've got a few myself. They grow and reproduce rapidly and irritate the other inhabitants of the tank. I'm also interested in zapping some pests.

High powered host with long duty cycles

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