after 60 seconds: Hi I'm a cartoon photon with arms, here to tell you that wavelength (denoted lambda) refers to the colour of light After 7:43: multiple fibres can feed into or split out of one evanescant field leading to the devepment of a fused biconic coupler ...Well, that escalated quickly.
@@Stefano_Rodriguez well my boss opted for a "cheap" laser. Vyteck with laserworx. I've moved away from the fabrication stuff now I'm a machine operator otw to programmer. They've had soooo much trouble with this laser. Can't seem to dial in anything thicker than .188 inch (7 gauge) stainless. The gas doesn't stop bw cuts lol Vytek said 🤷♂️.
@@jewwyjones9760 I see. Programming is good! I do the programming/nesting for the Amada as well. Maybe, they just need to play with the settings properly. I cut 3/8 stainless steel with the Amada with no problem, but we just need adjust the settings a little to get our smooth cut.
Hi ,, I am pursuing MTech from Laser Science and engineering from India and I want to work in foreign countries ,, friends as you are in laser related field ,,I want your favour ,,
Excellent Presentation. I watched first hand the development of a Fiber Laser used in LIDAR Applications from the perspective of a PCB Layout Engineer dealing with Pump Diodes and Optical Racetracks and the electronics driving them. Made for some interesting challenges. I never expected to have to change a board layout because of the reflectivity of objects such as a Stop Sign at the frequency of our Laser. Now I have a much better appreciation for the issues facing the scientists and the problems we Engineers had to solve to create a low cost mass manufacturable device. Thanks! We succeeded by the way.
That was intense but also amazing. A lot of those terms were over my head but that was well done even though it is a very complex subject. Would be awesome to see a multi-video series on this subject. Very cool stuff.
Excellent and detailed explanation. The issue that I am involved in is looking for the best temperature for the best wavelength so that the pump diodes bring the least pressure. The challenge is the temperature of the pumps and the temperature of the oxygen and nitrogen during cutting. By bringing the pump temperature to minus 12 degrees, we obtained lower quality and energy
This is the perfect kind of summary that should be done before most of engineering (and other fields) courses, and after this, the detailed explanations would make sense for the first time.
Thanks!! I really appreciate your efforts in this representation, it helps me to learn technical English and fiber optic principles (my native language is Spanish)
It's an easy explanation to follow if you replace all the formally unknown words with "things" and "stuff" and glaze over the other information he may have given.
my "scientific neurons" are happy again. education like this, gives me a sence of what i truly enjoy. the future is going to be exciting. too be honest though, i found this after seeing a ship being fitted, and northop grumman talking about theire use of fibre optic lasers.
I work with two 4,000 watt, and didn’t know what was going on inside. This video helps out. They are fiber lasers. I’m always amazed of what you can cut.
This was very informative, but I want to know if you can collimate a fiber laser into a low divergence beam. As a laserist this was very enjoyable, I work with ILDA show lasers and have wondered about the use of fiber coupled lasers. I know that you can collimate after a resonator but what about raw fiber output?
Excellent information. I was a little worried with it started with an animated photon, but I'm impressed that the core information was not simplified beyond reason. Of course, I'm a guy who has Bragg's Law tattooed on my arm.
But if this type of laser needs laser diode to pump it , then why we need fiber after that at all ? I mean in other laser like ruby , hene we pump it with normal diffused light from dis lamp that that active medium makes laser beam from light but in this laser if we use , let's say 1 watt Laser diode of any wavelength so how it would be beneficial to use fiber as amplifier medium because due to the fact that efficiency can't go higher then 100 (according to energy violation law) ?
I'm going to take a stab at answering this... because I have struggled with the same question. I think the goal is to get the beam quality to single mode and smoothly Gaussian intensity so the energy can be maximized when focused into a tiny dot. So the better the beam quality, the smaller the dot you can focus, the higher the Watt per Square Centimeter. Taken to its logical limit... the single mode with best beam quality has the smallest focal point which yields the highest intensity. Can anyone else validate this answer in case I'm missing something too?
@@jasonkocher3513 Yeah its a massive pain to combine the ouput of multiple diodes soo this basically solves that problem without needing a bunch of lenses to combind the ouput perfectly.
wow i didnt know all this was leading to engraving and other streams of art and income. thanx. i was really hoping you could recommend a portable unit for rust and paint removal on cars as rust repair is the most time and money consuming. seen a portable unit by Questt
Such a gritty level of engineering goes into these things. I really wanna see them produce the fused bionic coupler and what goes into its fabrication but I doubt that information is freely available.
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Interesting video. I have a few Q's if you don't mind. 1) You keep stating that you (the industry?) is striving for single mode fiber. I thought the communication industry liked multi mode fiber because they can run multiple wavelengths down it at the same time and get more bandwidth out of the same fiber. Perhaps for the purpose of fiber lasers single mode fiber is desired over multimode, 2) I am not sure of the gain of the fiber laser. If I am seeing this correctly, you need to start with a laser to make the fiber laser work. I thought semiconductor lasers were already monochromatic and I can not see getting more power out than you are putting in or you would have perpetual motion. What exactly are you gaining? Is this a way of shifting to a new wavelength? 3) Perhaps more of a statement.. The one big thing I do see is how to parallel multiple lasers together, but that seemed to have little to do with the fiber laser part. Is that a correct assumption? I plan on watching this again. It is definitely interesting. Thank you and your company for presenting it!
After reading Wikipedia, this is what I think I understood: 1) The communication industry also likes single mode fibers. Multi mode means that light takes multiple different paths through the fiber. One path is longer than the other. This means light will take longer to traverse a longer path than it will take to traverse a shorter path. This is modal dispersion. for example a pulse with a length of 1 ns is fired through a fiber. Lets say the slowest mode takes 100 ns to reach the other end, whereas the fastes mode take 90 ns to reach the end. This means a 1 ns pulse at the input of the fiber has turned into a 10 ns pulse at the output. This decreases the signal bandwidth of the fiber. furthermore single mode fibers are less lossy. 2) The fiber laser allows you to take one or more high numerical aperture lasers and combine them into one high power low numerical aperture single mode laser. The pumping beam travels mostly through the inner cladding, but interacts with the core to pump the lower energy state electrons into a higher energy state. when these electrons fall back to their lower energy state they emit a photon of a different wavelength. This is called spontaneous emission. when these emitted photons interact with other high energy state electrons, they cause them to fall back to their lower energy state and emit a photon with the same direction, wavelength and polarisation. This is called stimulated emission. This way you get a high power beam, with very little modal dispersion.
The utility of a laser in most applications is that you get to focus a lot of energy all in one place, higher intensity the better for most uses. If you think to focus a bunch of different laser diodes all in one spot of some tens of microns in dimeter and totaling a kilowatt or so, you are not really going to succeed at that. But if you use the same diodes to pump a fiber laser, then the output from that fiber laser you can focus all in one spot. Note, that the cladding the pump light travels in is a lot thicker than the core where the laser emission travels at. Don't get confused by the pump diodes being lasers themselves, you could be talking about a ruby laser bumped by a a flash tube, or a gas laser, it's going to be the same situation. The laser emission can be focused down to smaller spot for higher intensity than the pump energy can, that's the point of using lasers to pump a laser.
When describing the absorption length of a typical fiber laser, "13 db" is shown above the diameter of the loop in the example fiber (around 6:27 into the video). What is this unit of "db"? I cannot seem to figure it out. The unit of dB (decibels) doesn't seem to make sense here, but that's the only unit that I can find is abbreviated by the letters "DB". Is it 13 decibels?
This is decibel yes. Decibel is not a physical unit but a way of expressing a ratio between two quantities using logarithms. For sound it is used like a unit because the sound is compared to some reference (e.g. dBm means compared to 1mW). In this case it refers to a loss, the ratio of the input power to output power through the fibre. The advantage of using dB is that it allows you to add the losses so a 6dB loss followed by another 6dB loss is a 12dB loss whereas a loss of 0.5 followed by a loss of 0.5 is a loss of 0.25 which is less obvious for non trivial examples.
Lol, for faster and direct explanation, laser cutting machine, is a combination of Oxygen or just ordinary Air pressure etc. for cutting,, and a fiber laser beam ((meaning came from a multiple light beam into one direction)) or a large laser tube beam for melting, burning.
I think they meant larger diameter core. Large diameter core is easier for coupling the light into the fiber after it is generated from the laser diode's emitters.
I am an electrical engineer and I want to design my own fiber laser cutting machine. Where can I find diagrams and a working knowledge of building the fiber laser source? Thank you.
lulz drawings. Can you dope your own core and draw your own fiber? This is like next level glasswork, your chances of home shopping that are about nil nor is it something you can buy as a part and the challenges don't stop there. Chinesium laser sources start from few thousands, that's your best bet for a realistic staring point..
actually is a VERY good presentation . but is not for the common or day to day technician... is more for a specialist or a trainer for the field. very good anyway ....
