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!

My 4yr old son asked me, “why is a laser called a laser?” I said, “let’s find out!” and here we are! Thank you for your video! We really enjoyed it! ❤

Finally someone start to explain first and then Mathematically, this is how I liked and learn in my engineering time, today a lot of Academic start with Mathematics first,but can’t used without understanding why I need this Math and what I like to calculate, in this way makes more sense and the trick is done. Good Job, definitely I subscribe

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 have watched several laser videos and this is the only one where it actually clicked in my brain. Thank you.

We truly live in a wonder age. As a kid I would have to look this up on paper now I just click a button and it's there for me. Technology really is grand.

sir, make more videos like this with animation , it is very very helpful for us , we appreciate your efforts, Thank you very much sir

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

amazing explanation! its a delight to watch your videos!

This is the best video I have watched by far to explain what Laser is to me, it helps me a lot, thanks for making this video.

Brilliant presentation. Thank you sir! 👍👍👍

Very helpful Paul!! Many many thanks!!! Definitely I understand laser more now!!

Thank god. Someone who can explain something

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

Thats so great,i cant imagine how laser works in my theory class but now,its so cool..thank u sir

very thorough and informed and informative explanation of this common question. Thank you.

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

Great job, Paul. Clear explanations are your forte.

Great job on this one! Very clear!

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

Amazing explanation. Thank you sir !

beautifully explained....wanaa watch more like this..

Great Explanation, few of my doubts got cleared.

Awesome explanation!

Very, very helpful! Thanks!!

You are good at explaining,thank you

Well put and very easy to follow and understand

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

fantastic video! helped me out

very helpful. Thank you sir

Great video, thanks. 👍

super informative .. thanks a lot

Great explanation!

AMAZING! Photons bless you sir. THANKS

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 video, helped alot.

good illustrations thanks so much.

dunning Kruger always finds me. thanks for reminding me im stupid. there's so much to learn.

Great video, thank you Paul.

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

Good stuf, thank you!

Great information

sir wonderful explaination

Amazing explanation!

Nice explanation

GREAT EXPLANATION :))))))))))))))

Amazing

Thanks for simplest explanation

great!!!

Great video, thanks! I have a question: in the cavity how can we select the appropriate integer n to get the frequency we want? I think we will get a lot of forms of standing waves in the reflection process. 👀

Amazing. New subscriber

Nice video.

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

Excellent

8:50, why does the electron stay longer in this metastate after falling from a higher unstable state, vs. being excited immediately up to that higher state?

thank youu 🙌

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

Thank you sir! helped me a lot, have university finals next week.

Very nice !

Thank you.

Loved how you showed photon multiplication as if it was neutron fission with uranium :D

Best video

I loved your explanation, thanks. I have been working in the auto industry for a long time. I would like to read books in English with more content about laser, YAG and Laser Diodes for example. Professor, could you recommend good books. Thank you very much!!

Hi ! Thank you so much ❤️ But I didn't get the resonance part :( (The part where you where talking about length of the tube)

thank you !

Wow, lasers are how we exploit quantum properties of light. Amazing.

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

is there energy loss when the atom kicks out the electron that is the same as the one it absorbed?

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

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

All I want to know How the battery supplies the enregy where is negative n positive...on what leg of the switch does positive get solders to...

Does atom in excited state emit any photon when it comes down to metastable state?

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

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.

4:53 can you name the phenomena please? thanks for the video!

You are absolutely the best ! THE BEST !

12:09, May I ask what exactly the 'n' means? Can someone describe it in other words?

Guess I should keep this bookmarked, I've got a relative that's going to start year 11 physics next year and they want help with study :)

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!

شكرًا على الشرح الرائع، طلاب السادس اين انتم.

Why does the 1st photon increase the electrons energy level, but then the next photon makes it drop down again?

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?

Dr Evil probably watched this 100 times.

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.

WoW

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

I like his T shirts.

Hello! Big science; cosmology, astrophysics, theoretical physics... rely on only one experimental result, Michelson Morley on the search for aether, but it is 50% complete. A suggestion to the people of science: let's use Michelson's 1881 experiment and change his light, increase the light wave by "cm" and apply this experiment to measure the speed of a train relative to: the Earth's dominant gravitational field or DGF. With a successful determination of the speed of the train - means that the data on the size of the Universe and the registration of gravitational waves ., are incorrect …

why does an excited electron go to the metastate instead of the ground state?

good explanation my teacher but we -arab- need to translate your videos for people who can't understand the english plz and thanks to you

using this to make a laser gun for my assignment for English class

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?

☺️ thanks

How does this now deplete an atom to nothing? With all these amplifications I am not understanding how all of this energy can be taken out without the mass being reduced overall

Sir I thaught. The electron will leave the atom after taking the second photon

Hi! Before anyone thinks that an atom multiplicates light, for these people who did not listen at the start i tell, that the atom collects up photons to emit them in a uniform way, at the same time, just like a pulse. Naturally you can not make an atom to collect up more photons, because it starts to leak rather quickly. However you can give your atom more coloured photons, and overshoot its photon capacity, in order to gain more photon collection time. Due to this extended time, you can increase the probability of stronger photon pulses. At least this is what the video said to me. I wonder, if i was wrong.

I dont understand how laser cutting devices work . How do photons cut something?

it seems like the laser is getting energy from nothing, you put one photon into the electron and get two out. How is this possible; where is the extra energy coming from?

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

5:36 Two photons get absorbed and two photons get released. This doesn't explain how there is a photon multiplication.