First time I see a 3 years old video with zero dislikes in KZread!!! Now, thats pure quality!

I used to work for Lucent Technologies in the robotic assembly of these things, and it's amazing how little has changed in 15 years. These are still some of the most high tech Opto, Electro, Mechanical things you'll ever come across. 40GB/s of data down a tiny fiber for hundreds of kms.

Great video. I've been doing some work with similar lasers and I had no idea of what was inside of them. Thank you very much for making this excellent video.

Great teardown and very informative!

Excellent video as always!

Wow, very interesting! It's not often I learn something via youtube.

That was really cool, thanks for the video!

Excellent video, Thank you.

The milling made me happy!!

Perhaps you could consider it an extended cavity, but I'm not sure if's a laser cavity if stimulated emission isn't occurring.

Right, got confused there. The paper said it was the glass transition temperature.

No, but they said it could be damaged by connecting it to something that reflects too much light back towards the module. This would increase the optical power seen by the laser diode.

Thanks for sharing the video. What would a module like this be used for?

Great job with the uncapping! Wish I had a small desktop mill : /

Thank you for sharing!

Thank you for this awesome video…Can this cut metal? I’m a bit confused about the low power, (500mw), how is that amplified to cut metal? I’m looking into a diy laser cutter but I’m not sure which power I should get and how that power is increased. If someone could explain I’d be grateful. Thanks

great job....

I would say the bragg grating wouldn't be acting as gain medium, but is still part of the laser cavity. Intra-cavity second harmonic generation comes to mind. For example DPSS lasers use a KTP crystal for second harmonic generation within the laser cavity, but the KTP does nothing to amplify the light.

Not so much vibration, but mechanical stress can distort the package ever so slightly and throw the optical system out of alignment, causing it to lose lock.

Interesting that the laser diode die has so many bond wires, I've seen 1 watt diodes with only 2-4 bond wires

Weird thought that reflecting exactly the wavelength you want back into the laser and letting all the other stuff through, will give you more of the wavelength you want. Can this be seen as an "extended" laser cavity?

Another question: since the beam is fanned out coming out of the cavity and then focused by a lens, different parts of the beam have to go different distances. Does this mean that the different parts of the beam are no longer coherent and shifted in phase? At least looking at it geometrically it has to be.

Could it be damaged by an unterminated output?

How was it damaged?

How do tunable lasers work?

I place my bet on something messing up the laser driver that caused a large gob of current to come in and damage the laser diode. Laser diodes can be incredibly sensitive

interesting!!

cool. but not the Curie point at 6:00, there's no magnetism involved. It's just the photochemical precipitation of microscopic silver inclusions. like those photochromic sunglasses that automatically go dark outside. In this glass, the effect only occurs at high temperature, as I understand it.

Hello,friends. I got 20 pieces similar module, I want to focus the laser, can not find a suitable way, I think making a laser pointer, you can make marks on the wood. Do you have any suggestions? Thank you very much

@hefengsen2310

10 жыл бұрын

and the module is IPG PLD-5 . 1064nm. 5w.Thanks!

@tesla500

10 жыл бұрын

You can't achieve a perfect beam with a fiber coupled module, but you can get a somewhat collimated beam by placing a lens in front of the output fiber. Place the lens so that the fiber tip is exactly at the focal point of the lens.

@PeterXian

9 жыл бұрын

tesla500 this might be a stupid question, but why can't you achieve a perfect beam with a fiber coupled module?

@gavinsauer1608

8 жыл бұрын

+Peter Xian I'm just making an educated guess here so someone correct me if i'm wrong, but I think its to do with the laser light reflecting off the walls of the fiber-optic line in a zigzag pattern causing the light to be scatted and no longer be in a perfectly strait line making it diffused.

Bro you forget the fast axis lens It’s after laser diode

785nm

What wavelength?

@jesusmontano1007

5 жыл бұрын

Normaly fiber lasers have 1.06 microns wavelength

These are very specialized optical devices and thus very fiddly to make and made in low production volumes. Not to mention amortizing their development costs.

Not a CNC, just a Bridgeport clone, Maximart brand I think. It'll hold me over until I can find a CNC.

Your explanation for how a laser works is off: electrons emit light when they drop by an orbit, not when they rise one, since that light was the energy had when it was in that higher orbit.

? He never said the electrons emit light when they are moving to a higher energy state. Btw. wou you can be sure he knows what he's talking about, when he works at a company that uses 1000s of dollars laser equipment.

Bingo. Thermal runaway from insufficient heatsinking.

"electrons emit light when they drop by an orbit" -- that's what he said. Listen again.

Why so expensive? The company that makes it should be more reasonable and charge like $50-100, they will still make a decent profit.

Thank you for this awesome video…Can this cut metal? I’m a bit confused about the low power, (500mw), how is that amplified to cut metal? I’m looking into a diy laser cutter but I’m not sure which power I should get and how that power is increased. If someone could explain I’d be grateful. Thanks