How lasers work - a thorough explanation

I looked up a lot of videos for lasers, and this is the cleanest and clearest of them so far. Great video! Covers the basics concisely!

in January and February 1965, I had one of the first laser eye surgeries in the world at the Philadelphia Naval Hospital. I had a distorted pupil from being hit with a rock-laden snowball. To this day, at age 78, the eye that received that treatment is better than the other eye. However, there is nothing in the literature of lasik eye surgery going back that far. Lasers were invented in July 1963, and just 18 months later, the Navy was experimenting with it, and I was the subject. I would like to have comments on this posting

We have learned that atom have two type of states, ground and excited. Then metastable come from?

Does a laser beam bend to suit the curvature of the earth? ie ... does a laser beam respond to such things as magnetism and gravity? THANKS in advance 👍

Could you help provide us some path to enlightenment to Fiber LASERS. Can we build that home as the materials are esaily available now a days.

Nice way to byheart speed of light. 299 792 458m/s😂

Very beautiful explanation Sir, you have explained every concept from the basics. Thank You So Much Sir.

You talk as if you are rapping. I even have to replay a statement twice to understand it but your video is cool

That 299792458 m/s isn’t the law. It’s the definition. Of length, when combined with cesium 133.

very good explanation!

wonderful explanation despite funny pronunciations to mine americanized wernicke's area.

Best video

شكرًا على الشرح الرائع، طلاب السادس اين انتم.

Great video explaining the creation of a laser beam! Super simple but still very in depth and easy to understand!

Very nice !

Hello Sir, I am Laser Instructor in Beauty School and last part of your video is what I tell students to write down so they understand how lasers work. They don’t need anything more to remember. Thank you! You make it easy to understand!

I've been loading a rust server and forgot to mute the background music while watching this video and it sounded FIRE

Thanks for simplest explanation

Frickin great Video. I am an engineer in a completely different field and just curious. Loved the explanation

Oh my.. this is a wonderful way to explain lasers, Thanks a lot.. I finally get the whole population inversion and stimulation

Thank you for this interesting video. I also want to thank you for not using any distracting background music. Nice!

Awesome explanation!

Perhaps next time you could make two videos... a 5 minute video giving the facts; and an 8 minute video of how you like to verbally retrace your own linguistic tracks.

Maybe you title should read: How to be as confused as I am about lasers.

I kept trying to listen to you; but you kept talking over what you were trying to say. Two words forward, one word back. You sprinkled a scientific explanation with hymning and hawing.

The way he is explaining amplification makes it sound like you are getting free photons out of nowhere.

Working on a video about lasers and trying to understand how they work, after watching this I can confidently say I know how lasers work... Mostly haha

Amazingly explained..was looking for such basics since a week❤

very helpful. Thank you sir

Weird eye.

Dear Sir, I really need your help. How can I find out if a laser could do any damage to the eyes with a skin tightening procedure. My dermatologist did not use glasses for safety, he said a laser does not scatter, but then I later I found out, that some practicioners do use eye protection. I kept my eyes closed of course but I am concerned if some light could go in the eyes within the little gap which sometimes maybe left I had at the second day a lightly blurry view, but maybe that happened only because of the streching the upper eyelids. I did a treatment not to much but on one side minimal under the eye and my upper eyelids wit a fraktional co2 Laser. Could you please tell me in which scope energy can disapear from the laser shuts? Can Laser really not scatter? Thank you!

Preparing for my Modern Physics exam, this one really helps! Thanks a lot! More power to your chanel.

thank you !

great!!!

Quick question I bought a laser pointer online you've probably seen it it's a big silver metal laser it's really strong lately I just noticed that it's not as right as it once was or when I turned the focus ring it doesn't seem to get as small as it used to be there for making it brighter it tends to want to be a lot larger now is that a problem with the laser or something inside or is it just possibly the lens I was going to open it up to look inside but there is no way to get all the way inside completely without breaking something as it's a solid metal frame it looks like the laser itself is threaded and I did a lot of twisting and turning but nothing has really helped it yet could it have possibly died it's not that old and there's no scratches or any damage to the actual lens that I can see under the microscope thank you for your time

Well put and very easy to follow and understand

A PhD student here, thank you sir. It's very interesting to know the length of the tube is what determines the frequency.

Thank you for this video, helped alot.

I have a question I have never been able to find an answer. Since the laser light is collimated does it obey the inverse square law?

Why do we need metastable state in lasing action?
Please give me answer

WoW

Excellent video, well done. I will be using it with my physics classes from now on.

Based on your explanation it seems unnecessary to have that highest energy state since electrons immediately drop to that middle state. What’s the purpose of that top state? Why not just move electrons to the middle state directly from the ground state?

good illustrations thanks so much.

Thank you.

"it now releases two photons, increase of photons and therefore amplification, i start with one photon and ends up with two" ???
But.... there were two photons coming in ??? so... not starting with one photon but two ????
Where's the amplification ???

Great job, Paul. Clear explanations are your forte.