70w ir

[mfo]

70W 808nm Fiber Coupled Burning Laser Diode DPSS - eBay (item 180408677477 end time Oct-16-09 12:55:38 PDT)

Two 35W lasers combined for 70W. Seems weak. I guess it's out of focus?

 

[Things]

No focus + he's probably underdriving it.

 

[Laser_Ben]

Those are very good diodes, you'll get ~15 degree cone from the aperture. The issue is they are amazingly sensitive to damage from back reflections and from contamination to the fiber. This is not a good setup for burning without a very elaborate setup on the end of the fiber.

 

[Benm]

I'm sure its running way under max power in the video. The wood seems to absorb a good portion of the light, but if you compare the effect of a 50 watt class CO2 laser, you'd expect that stick to go up in flames right there, if not cut in half.

 

[MarioMaster]

Keep in mind CO2 lasers are great for burning as the very long wavelength is absorbed by just about everything.

I have a 60W diode bar and reflective items can be very difficult to burn.

Looking at the video it does seem to be very underpowered.

Compare to my video of my 808nm bar burning stuff at about 80% power

 

[mfo]

Awesome laser MarioMaster. One day when I am fortunate enough to own my own house with a garage, I will endeavor to construct such a laser. It really blows me away that something you can't see can cause such damage. How far away can you burn things with that thing, and about how much did it cost? What else can you burn with that? + rep to you!

Also, what's the name of the song that starts up around 1:55?

 

[MarioMaster]

Awesome laser MarioMaster. One day when I am fortunate enough to own my own house with a garage, I will endeavor to construct such a laser. It really blows me away that something you can't see can cause such damage. How far away can you burn things with that thing, and about how much did it cost? What else can you burn with that? + rep to you!

Also, what's the name of the song that starts up around 1:55?

Thanks, I managed to snag that bar on ebay a while back for $150. The beam has enough power to burn things for at least a foot if not more unfocused, but I don't really have enough optics other than a plain lens to bring it to somewhat of a point for more burning. So it certainly doesn't have a good beam but even the raw diode output can really cook stuff which is why when I see this other video - it can barely smoke wood right up at the collimator assembly from the fiber.

Doesn't seem up to spec to me.

 

[mfo]

Thanks, I managed to snag that bar on ebay a while back for $150. The beam has enough power to burn things for at least a foot if not more unfocused, but I don't really have enough optics other than a plain lens to bring it to somewhat of a point for more burning. So it certainly doesn't have a good beam but even the raw diode output can really cook stuff which is why when I see this other video - it can barely smoke wood right up at the collimator assembly from the fiber.

Doesn't seem up to spec to me.

It seems IR's are the best for burning eh? Most specifically CO2's. Also, whats the name of the song?

 

[MarioMaster]

I don't remember - sometimes I record stuff off net radio.

808 behaves pretty much like visible light - white stuff is hard to burn

CO2 is way out on the IR at 10600nm and is absorbed by even glass

 

[mfo]

I don't remember - sometimes I record stuff off net radio.

808 behaves pretty much like visible light - white stuff is hard to burn

CO2 is way out on the IR at 10600nm and is absorbed by even glass

Yeah, that's pretty psychotic right there. I definitely want a CO2 laser. After IR comes radio waves, right? I think they use RW lasers to cool stuff down....

 

[PlasmaCube]

Yeah, that's pretty psychotic right there. I definitely want a CO2 laser. After IR comes radio waves, right? I think they use RW lasers to cool stuff down....

Technically, although they're sometimes classified as radio waves, the next step from IR are microwaves, starting at around 1mm wavelengths.

And I still don't know how someone could look at a laser and be like, "Hey, I bet I can use that to make things colder..." If I recall correctly, I think the technique is known as Doppler cooling. There was a feature on NOVA about absolute zero, and I believe they discussed how the lasers were used quite a bit.

 

[mfo]

Technically, although they're sometimes classified as radio waves, the next step from IR are microwaves, starting at around 1mm wavelengths.

And I still don't know how someone could look at a laser and be like, "Hey, I bet I can use that to make things colder..." If I recall correctly, I think the technique is known as Doppler cooling. There was a feature on NOVA about absolute zero, and I believe they discussed how the lasers were used quite a bit.

Who said that?

 

[PlasmaCube]

Uh... I was trying to make a joke... Y'know, about the whole "cooling" thing.
Not that it was funny or anything.

 

[mfo]

Uh... I was trying to make a joke... Y'know, about the whole "cooling" thing.
Not that it was funny or anything.

Sorry, but it totally went over my head. I guess because I know of the doppler effect.