Old 05-17-2008, 01:59 PM #1
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Default No IR filter?

Ok so I remember these videos I saw a long time ago. They showed a 50mW with an IR filter and a 50mW without one. First off, the normal 50mW WITH IR filter shot at a Coherent pocket laser check meter displayed just that, average of around 50mW with some peaks and lows but next the 50mW WITHOUT an IR filter showed off like 500mW of power, they said its because the laser check cant tell the difference between green and IR and just measures the power.


So if I took the IR filter off (yes I know its very dangerous) it would land me some huge amount of power like that, I asked the question a while back and somebody said I would only get like an extra 10mW of power? And yes I know that IR is not like a laser beam and you have to be at its focus point to burn stuff well.




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Old 05-17-2008, 02:09 PM #2
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Default Re: No IR filter?

Removing the IR filter really won't be worth it, you will get more power but it won't be very useful, you won't get 500mW if that's what your asking. If you just want to burn, take out the crystal set and slap a lens in front of it so it has a close focal point, if the DX True 50s have a 500mW Pump, then you will have a 500mW IR laser.
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Old 05-17-2008, 02:19 PM #3
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Default Re: No IR filter?

Oh yea and one last question, its the crystals that the IR passes through that makes the green light, right? So if I would take off the crystals I would get an IR laser and then like you said, slap a lens on it and you got a good burner.
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Old 05-17-2008, 02:22 PM #4
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Default Re: No IR filter?

Quote:
Originally Posted by xJumper
Oh yea and one last question, its the crystals that the IR passes through that makes the green light, right? So if I would take off the crystals I would get an IR laser and then like you said, slap a lens on it and you got a good burner.
Yep, the crystals are what make the green light. A good thing about the DX50 is that the crystal set just unscrews out (or so I've heard) so if you ever want it to be a green laser again, you can pretty much just screw it back in until the dot is at its brightest.
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Old 05-17-2008, 02:24 PM #5
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Default Re: No IR filter?

It's got glue as well as the screw. You have to melt that from the outside.
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Old 05-17-2008, 02:29 PM #6
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Default Re: No IR filter?

So why the heck don't we all buy IR lasers and then just ad some crystals salvaged from some crappy 5mW greenie?

http://www.dragonlasers.com/catalog/...W-p-16219.html

+ some crystals held in front of it and then you got 700$ green laser!
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Old 05-17-2008, 02:38 PM #7
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Default Re: No IR filter?

because 5mW greenie crystals are weak, and aligning crystals is a son of a bitch to do. Even if you do mount the crystals right in the 200mW IR, you have... a 5mW greenie, which you had before anyway. All you just did was swap the wavelengths of the lasers... o.O
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Old 05-17-2008, 02:41 PM #8
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Default Re: No IR filter?

So what is it that cost so much in lasers then, diode or crystals?
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Old 05-17-2008, 03:11 PM #9
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Default Re: No IR filter?

Quote:
Originally Posted by xJumper
So what is it that cost so much in lasers then, diode or crystals?
It is definitely the crystals + labor for alignment. 808nm laser diodes are dirt cheap these days so it all comes down to the crystals. Crystals don't turn all of the IR light into green either, 10%-25% efficiency is the most common. But also, the size of the crystals matters too, the crystals in a 5mW green laser these days will only put out a max of 5mW of green, no matter how much IR you pump into them.
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Old 05-17-2008, 04:11 PM #10
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Default Re: No IR filter?

so about how much IR would you be getting from a 20mW with no IR filter?
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Old 05-18-2008, 02:13 AM #11
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Default Re: No IR filter?

>if the DX True 50s have a 500mW Pump, then you will have a 500mW IR laser

So Styropyro if what you say is true than why is it that dragonlasers is selling 808nm 200mW IR lasers @ 200$ when you could just get a crappy greenie with out the IR filter and crystals and you would have around if not MORE of that power.
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Old 05-18-2008, 02:19 AM #12
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Default Re: No IR filter?

the answer to that is because the DX ones aren't diverged well.
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Old 05-18-2008, 02:39 AM #13
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Default Re: No IR filter?

Quote:
Originally Posted by xJumper
>if the DX True 50s have a 500mW Pump, then you will have a 500mW IR laser

So Styropyro if what you say is true than why is it that dragonlasers is selling 808nm 200mW IR lasers @ 200$ when you could just get a crappy greenie with out the IR filter and crystals and you would have around if not MORE of that power.
Well, the one Dragonlasers is selling is a CNI and it is better quality, but when it comes down to price, pulling the crystal set out of a cheap "100mW" greenie is the obvious best way for IR.
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Old 05-18-2008, 02:47 AM #14
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Default Re: No IR filter?

Quote:
Originally Posted by styropyro
[quote author=xJumper link=1211032760/0#10 date=1211076798]>if the DX True 50s have a 500mW Pump, then you will have a 500mW IR laser

So Styropyro if what you say is true than why is it that dragonlasers is selling 808nm 200mW IR lasers @ 200$ when you could just get a crappy greenie with out the IR filter and crystals and you would have around if not MORE of that power.
Well, the one Dragonlasers is selling is a CNI and it is better quality, but when it comes down to price, pulling the crystal set out of a cheap "100mW" greenie is the obvious best way for IR.[/quote]

absolutely. close range burning like crazy!
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Old 05-18-2008, 12:41 PM #15
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Default Re: No IR filter?

Sweet! When I need to burn stuff I will do that!
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