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Laser fundamentals III

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Laser fundamentals III
Untertitel
High power argon lasers
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49
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Abstract
This resource contains demonstrations used to illustrate the theory and applications of lasers and optics. A detailed listing of the topics can be found below. Lasers today are being used in an ever-increasing number of applications. In fact, there is hardly a field that has not been touched by the laser. Lasers are playing key roles in the home, office, hospital, factory, outdoors, and theater, as well as in the laboratory. To learn about lasers and related optics, one usually takes a course or two, or acquires the necessary information from books and journal articles. To make this learning more vivid and more exciting, and, one hopes, more understandable, one needs to see some of the basic phenomena involved. To fill this need, Professor Ezekiel has videotaped 48 demonstrations that illustrate most of the fundamental phenomena relating to lasers and physical optics. By using split-screen inserts and a wide range of video-recording capabilities, it is possible to show real-time effects in lasers and optics with the simultaneous manipulation of the components that cause these effects. In this way, one can see effects in close up that would be difficult, if not impossible, to display in front of an audience or in the classroom. These video demonstrations are designed for: The individual student of lasers and optics who wants to observe the various phenomena covered in theoretical treatments in courses, books, and technical papers. The Instructor in lasers and optics in a company, university, college, or high school who wants to illustrate, in class, many of the fundamental phenomena in optics and lasers.
VideotechnikInfrarotlaserOptisches InstrumentLaserGrundfrequenzMaterialErdefunkstelleBildqualität
LaserKartonTrenntechnikGlimmlampeUltraviolett BFACTS-AnlageBesprechung/Interview
AtmosphäreLaserMagnetKraft-Wärme-KopplungAnodeBogenlampeGasentladungslampeKathodeLeistungssteuerungUltraviolett BWasserkühlungRückspiegelAnstellwinkelGrünWellenlängeBlasebalg
LaserKartonLeistungssteuerungGauß-BündelLocher
KartonGauß-BündelLocher
Transkript: Englisch(automatisch erzeugt)
The following content is provided under a Creative Commons license. Your support will help MIT OpenCourseWare continue to offer high-quality educational resources for free. To make a donation or view additional materials from hundreds of MIT courses, visit MIT OpenCourseWare at ocw.mit.edu.
We're now going to look at another laser, the argon laser. It's much more powerful than a helium neon laser. In fact, it can put out several watts and even several tens of watts, principally in the blue, in the green, and also in the ultraviolet.
In this first demonstration, we're going to take the output of this argon laser here. And without focusing it, we're going to send it onto a piece of cardboard. And we want to show you what happens.
Now, here you see the argon laser puts out about two watts or so in the blue and green. The blue is around 4880 angstroms. The green is around 5145, and other weaker wavelengths,
both in the visible and also in the ultraviolet. You can't see very much of the laser, so what we're going to do is take the top off so you can get a closer look at what's inside this laser. Here is the argon laser without the top on.
Suddenly looks very complicated, but I'll try and help you along by identifying some of the important features in the laser. And we'll do this in close-up. So first, let's zoom in to the left side of the laser
where we see the mirror mount that holds one of the laser mirrors. So the mirror is held down there. And then the air path between the mirror and the discharge tube is sealed with bellows over here.
And here is, then, the beginning of the discharge tube. Here you see the cathode, the big cathode for this laser. The bore of the tube is inside this magnet, so you can't see it.
And then there is this magnet here that provides a longitudinal magnetic field. So here is the magnet. And then the anode is located over here. Now, because this is a powerful arc discharge,
both the bore and the magnet are water cooled. Over here, you see that the discharge tube is terminated with a window at Brewster's angle. And finally, the second mirror is mounted in this holder
over here. Now we're going to turn the power on and look at the output. Now, the argon laser puts out a lot of power, as I said, around one or two watts from this laser.
And one thing you don't want to do is get in the way of the beam. Now, here we see a piece of cardboard that's unlucky enough to be in the way of even an unfocused beam. So if we turn up the power in the argon laser, you see what happens.
You see a nice hole burnt in, and lots of smoke comes out. And this is, remember, this is the unfocused beam. We have about one watt of power.
And here's the hole we just burned in the piece of cardboard. Looks pretty bad. And remember, this is the unfocused argon beam.