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muRRat
Wicked Lasers Master
Joined: 07 Dec 2006
Posts: 888
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Location: TURKEY
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 Posted: 12/04/07, 1:46 AM Post subject: A few stra |
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I checked out the techlasers and it says for ranger 808nm IR laser the output power is 1-400mW. What does it mean?
I can buy a laser and it can be 1mW or if I am lucky I can have a 400mW one? 
Here is the link.
http://www.techlasers.com/infrared-lasers-808nm-p-64.html
I also want to know if do they burn as much as greens.
400mW green can burn anything and what about IR ones? And which wavelength is a better burner? 808-980-1064nm ?
As a rule 808nm has to have the most energy but I don't know about burning!
Can I see the beams with nightvision? |
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Athoul
Wicked Lasers God
Joined: 13 Sep 2005
Posts: 7511
Location: Canada
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Amnizu
Elite Laser
Joined: 06 Jul 2006
Posts: 150
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| Posted: 12/04/07, 1:41 PM Post subject: |
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| I think on another page pertaining to IR lasers, it says 500-1500mW. Definitely ask for clarification. |
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muRRat
Wicked Lasers Master
Joined: 07 Dec 2006
Posts: 888
Picture(s): 110
Movie(s): 21
Location: TURKEY
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| Posted: 12/04/07, 2:07 PM Post subject: |
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Thank you for your answer Athoul.
I am no so clear about that energy thing. As you say the energy of the lasers with same mW ratings has the same energy. As I know the rule explained at the below link, higher the frequency (lower the wavelength) higher the energy.
I think the energy in mWs is about the brightness and the energy explained below is about its absorbtion 
I am fully confused
http://science.howstuffworks.com/light3.htm
And there is also a 980mW is it also a diode laser?
Then if mW is the power to burn than any wicked laser can be a very well burner with a 200mW IR diode if you can take out the Nd:YVO4 and KTP cyrstals, am I right?
And as you and everbody tells the IR lasers are not well collimated in the videos below they look like very well collimated ( at least as well as greens  )
http://www.youtube.com/watch?v=AoblNytUocA
http://www.youtube.com/watch?v=1bAMu6m0Yug |
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Athoul
Wicked Lasers God
Joined: 13 Sep 2005
Posts: 7511
Location: Canada
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| Posted: 12/05/07, 3:10 AM Post subject: |
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Shorter wavelegnths are definately more energetic, however watts is a unit of measure. Thus 100mW of any wavelength will be 100mW. A longer wavelength laser would just have more photons being emitted to make up 100mW then a shorter wavelength of the same output. Basically the longer wavelegnth has to work harder to keep up in laymans terms. However 100mW is 100mW. Or consider the following example, the 100mW shortwaver laser is like a single cell 1.5V 1800mah battery and the longer wavelength laser is like 3 1.5V 600mah cells joined in parallel. We get the same rating, but there are more cells in the later.
Laser diodes come in 980nm, it's not a common wavelength for a portable though.
You are also correct, any Wicked laser can potentially be a powerful 200mW+ IR laser if you removed the MCA. However these diodes in some cases are c-block type or open can, both very sensitive!
It's not that the IR lasers can't be collimated, but that in the green lasers it's not the IR diode that is collimated. In most cases the MCA is butted right up against hte diode such that it gets infused with as much pump energy as possible without the need for any focusing of the diode. It's also cheaper, less optics. You could collimate the laser diode, but you would have to do this manually and preferably with a lens that is optimized for that wavelength... not that the ones on most visible lasers will not do a good job of it.
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Last edited by Athoul on 12/05/07, 11:51 PM; edited 3 times in total |
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muRRat
Wicked Lasers Master
Joined: 07 Dec 2006
Posts: 888
Picture(s): 110
Movie(s): 21
Location: TURKEY
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| Posted: 12/05/07, 8:02 AM Post subject: |
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Perfect explanation.
Thanks a lot. Everything is clear now
I understand that the collimated light is the green not the IR.
I think I need special lenses optimized for IR because of the refraction.
Does green and IR collimating lenses differ so much?
For collimating do I need only one convex lens or a concave first and a convex after? |
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Kalwi
Modified 10mW Greenie
Joined: 16 Jan 2008
Posts: 20
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| Posted: 1/16/08, 2:25 AM Post subject: |
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| The lasers in those videos are professionaly made, military grade stuff there.....You can't colimate a standard multimode 808nm(I think pump diodes are also multimode....I think) diode that well with regular optics.Also regular glass becomes opaque to longer IR wavelengths.I read that IR lasers use special ZnSe lenses for efficient collimation, and those cost more because their not so common, and probably harder to make. |
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muRRat
Wicked Lasers Master
Joined: 07 Dec 2006
Posts: 888
Picture(s): 110
Movie(s): 21
Location: TURKEY
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| Posted: 1/16/08, 5:32 PM Post subject: |
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| Kalwi wrote: |
| The lasers in those videos are professionaly made, military grade stuff there.....You can't colimate a standard multimode 808nm(I think pump diodes are also multimode....I think) diode that well with regular optics.Also regular glass becomes opaque to longer IR wavelengths.I read that IR lasers use special ZnSe lenses for efficient collimation, and those cost more because their not so common, and probably harder to make. |
I don't think that they use ZnSe lenses at these IR lasers!
Therefore lasers can cost more than their weapons  |
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Kalwi
Modified 10mW Greenie
Joined: 16 Jan 2008
Posts: 20
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| Posted: 1/16/08, 7:10 PM Post subject: |
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| The targeting laser in the second video most probably costs a lot more than most assault rifles.... |
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Schrecken Licht
Wicked Lasers Master
Joined: 05 Jun 2006
Posts: 717
Location: Maryland USA
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| Posted: 1/17/08, 12:10 AM Post subject: |
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The only IR lasers that I know of that use Znse lenses are CO2 lasers...which is probably a good thing, because those lenses are expensive and require extreme care when it comes to handling and cleaning. Even a Nd:Yag at 1.64nm in the near IR can use regular glass lenses, so the 808s do as well.
I think you have to go below 3.5 or 4nm before regular glass becomes opaque to the beam.
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Spyderman
Elite Laser
Joined: 06 Jan 2008
Posts: 126
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| Posted: 1/19/08, 11:18 PM Post subject: |
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IR burns great, but has awful divergence over 10mrad
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