Laser Fundamentals I | MIT Understanding Lasers and Fiberoptics

Laser Fundamentals I
Instructor: Shaoul Ezekiel
View the complete course: ocw.mit.edu/RES-6-005S08
License: Creative Commons BY-NC-SA
More information at ocw.mit.edu/terms
More courses at ocw.mit.edu

[@haiteng61]

This video series is the most helpful laser primer ever for me. I am a physics PhD starting to work heavily with lasers but never truly understood how it works. Professor Ezekiel is really conveying physical pictures, and pictures only, without too many equations to mess with your flow of thoughts. The experiments to demonstrate the inner workings of lasers is super pedagogical, too. Nowadays we only work with "blackbox" lasers with buttons and knobs, you seldom get to play with cavity mirrors within. And since the physics of lasers will always stay the same, these videos by Professor Ezekiel will be timeless notwithstanding the old style in which it was made.

[@sanaashraf438]

Couldn't agree more. Because of the same case with me, I am a physics PhD started working heavily with the laser which is quite new for me. This man is a savior for me lol

[@mertgulcurgs]

This is an excellent source to get a grip on laser theory - simplified, yet gives you the essence. RIP Prof Shaoul Ezekiel

[@anteconfig5391]

I love the internet. I love freely dispensed information. The world needs more of this.

[@brendawilliams8062]

It’s too bad internet can’t be tailored to educational uses. Chaos doesn’t help children or the stability of a multiverse of society. A shame.

[@Heart2HeartBooks]

Free lecture from MIT Professor! I love the internet!

[@ehabdawood7708]

please pray to Prof Ezekiel, he is originally from Iraq but he was migrated with his family to USA , RIP prof Ezekiel, those video source hope to be granted you in a top of heaven as most of students use it till now as a most important source to learn about laser

[@brendawilliams8062]

A beautiful name.

[@leif1075]

He died?

[@GregDubela]

Thank you for opening your doors to this knowledge. It truly helps people that strive for a deeper understanding of the world around us.

[@BushCampingTools]

Forever teaching on the Internet. He was a fantastic teacher.

[@brendawilliams8062]

Was? I am sorry

[@Salamalakash]

This video series is the most helpful laser primer ever for me.Thank you for this great explanation!I'm so thankful for these videos

[@mortenthorpe]

Life before PowerPoint slides, ladies and gentlemen ;)

[@lassinakonate7885]

Great thanks to MIT OCW and to prof Shaoul Ezekiel

[@MyWorld-sx2tq]

RIP Professor Ezekiel

[@_war_cry]

rip

[@oliver1098]

RIP.

[@bigmumliu]

This guy is the advisor of my advisor!

[@VicVlasenko]

Thanks. I learned this long time ago, but listened this lecture with big pleasure.

[@waqarshah6173]

Thanks Sir for such informative session on LASER.. I m physics student and my favourite topic is LASER studies and its practical applications..💐💐👍

[@himanshubareth1812]

this is awesome a great depth into the properties of laser

[@rock3tcatU233]

This is such a fantastic lecture, thanks a lot!

[@HydrogenXpi]

I'm so thankful for these videos

[@iheartmambo8211]

This is a wonderful lecture! It goes at a perfect rate. I like the natural speaking style! Possibly the best Laser class online! super like! :)

[@jacobvandijk6525]

As long as you understand that this is perfect for you (and a group of other people). For other groups it's too fast or too slow. Relativity!!!

[@GeldpressDerBlog]

Thank you for this great explanation!

[@sukanyasukanya4615]

it's used to all students thank-you so much Sir

[@kafumbla]

I absolutely LOVE that quote

[@masterofmixing]

Thank you Professor.

[@vlupis1]

Great lecture!

[@fenghc1]

Excellent Introduction！

[@64etto]

Thank you very much, Merry Christmas

[@samykamkar]

Great intro. Cliffhanger on 'dem gains, vid II here I come.

[@raunak51299]

nice surprise seeing u here

[@deepthi4920]

nice lecture

[@TheFag]

i learn a lot, thanks!

[@Edaiz69]

Thank you.

[@affordablehealthcare9152]

Thank you!

[@Nithr1s]

it's great!! thank you!

[@kabandajamilu9036]

So educative

[@kabandajamilu9036]

So nice

[@Pocahonkers]

You can even watch videos from Earlier times if you find any, and it should be correct, Physic is NEVER changing its only expanding.

[@SHANI1900]

Thank MIT

[@rhubarbcheese]

Thanks MIT for providing these. I think free education is essential for the future. Education should be free and made into video so we can educate the world and ourselves. I personally prefer video education over text education. If all education would be on video, more internet education and most importantly make the point to think for yourself and dont be afraid of ridicule. No more money. Resource based economy for the win and free education for the win. The heart tells us what to study.

[@brendawilliams8062]

You need to understand what you are contributing to if and when you do have the ability ever to contribute. People seem to not think about the meaning of the prize will not be the same to all. They don’t.

[@dr.mahmoudasfour2265]

Very nice intro

[@BuyGoldRegalAssets]

Thanks

[@shivjikhanath3586]

43:43 sir but frequency will remain the same in this case ? how the frequency will change ?

[@windrunnerextreme]

thx MIT (i think it's easy to understand :) )

[@SmilenWave23]

I wish this lecture came with a downloadable slideshow

[@linfan619]

Never knew why it is called a resonator/oscillator...😂,though I still do not understand standing waves. This is amazing.

[@arundcz]

RIP professor.

[@cerimite7674]

Could one use superconductivity to prevent energy loss?

[@skoolscribe3918]

pairing engineering illustration with physical tests according to human laws of physics , specifically for materials state conversion in recycling units.

[@skoolscribe3918]

it would be nice for one laser unit to vary according to the nature of an inserted material so that the laser transitions from an identification sensor to one that is an evaporation tool before the material is then condensed and stored via an automated vacuum seal mechanism into an inner chamber of the recycling unit.

[@skoolscribe3918]

laser radiation for chemical identification according to diffraction ratios according to any constants created due to experimental action.

[@speedbreaker5642]

thanks a lot....

[@AnggusKopeliani]

спасибо

[@mariana.tamura]

Amazing.

[@guoqingpu3625]

Great lecture!!! But I found an error that 0.5 um should be 5e-7 not 5e-5, the latter is 50 um. Anyway, it is just a small error and do not prevent spread of the idea.

[@NILpotent]

This is a great broad intro to the laser landscape especially as compared to other light sources. No derivations though 😢

[@ajinkyasinhrajput1460]

very nice thanks you

[@itrfayurvedicmedicine8727]

thenks to youn ilike4 good serveses provided realy

[@rb10011]

RIP Professor 🙏

[@skoolscribe3918]

Quantum laser protective system for weather combatance against photon damage on human or vehicular photon damage.

[@Every1cansing]

smart guy

[@paulo4771]

My brain hurt by the end of that.

[@calengr1]

10:25 spectral width measure

[@MohammadHizzani]

Can I get the slides? and the transcript? and where is the syllabus of this course?

[@mitocw]

Sorry this resource really doesn't have any materials! The only additional thing is a list of related courses. You can see the list at ocw.mit.edu/RES-6-005S08.

[@manofmesopotamia7602]

I am getting confused ! GHz is higher in frequency than MHz, which means the wave frequency measured in GHz has shorter length ! so why light wave in GHz while Laser beam in MHz?

[@DarkTahmi21]

Here Ghz and Mhz is not the frequency of the light, it's the spectral width / bandwidth. For example you create a lamp that can emit light with frequency of 1 THz to 1.01 THz. In this case the spectral width is 1.01 - 1 = .01 THz or 10 GHz. I hope it's clear to you now. For Lasers the spectral width is smaller, meaning it has very little variation in frequency when outputting light.

[@abbasafridi4732]

Yes , its just the linewidth of the laser. Not its center frequency !

[@kabandajamilu9036]

RIP professor

[@MrSainadh143]

it's nice

[@gweems828]

Cool

[@calengr1]

17:40 2nd unique property highly collimated beam

[@amruth01]

I'm thinking what he is using as a pointer?

[@Parzival224]

Can a laser beam be used as a radio antenna?

[@boogliummoo7809]

Highly energetic thing's require containment field's to mitigate any damage created by accidental or unintentional escaped radiation or field. Another thing. Why is a stone not "charged" as opposed to the other terminology "pumped". Are you saying there is a fluid or liquid?

[@muditPanwar]

can any one explain why have they shown a concave lens in the diagram to converge the beam at time 24:49 ?

[@sngmrng]

+mudit Panwar it is not a concave lens, these are plano-convex lenses.

[@Muonium1]

what part of the title "Laser FUNDAMENTALS" is confusing for you?

[@rigo6156]

What are the prerequisites for this course?

[@mitocw]

There are no prerequisites for this resource. See ocw.mit.edu/resources/res-6-005-understanding-lasers-and-fiberoptics-spring-2008/ for more info. Best wishes on your studies!

[@aashanmirarmanmir465]

❤

[@rigeleisenheim8860]

i feel sorry that he is dead. great instructor

[@a.k.3283]

1.21 gigawatts!!!

[@xTxNarutoxTx]

Any intelligent fool can make things bigger and more complex... It takes a touch of genius - and a lot of courage to move in the opposite direction. ~Albert Einstein.

[@samweirdo]

Zoidberg?

[@juanferove]

Because Laser Fundamentals haven't changed since then

[@PFCHarrie]

So you're telling me...if I watch this video...I can build an Iron Man suit?

[@stevecann4433]

I agree. do you not think it was a bit drawn out in places? no disrespect, but a bit less pen waving, and more attention to detail? although, im no good at math so glad that was smoothed over!

[@napoleonbonaparte525]

I saw there is a lot of views in theoretical video but little on demonstration. There is link to playlist: kzbin.info/www/bejne/f6LTaIGuo9yUfbs

[@siprus]

You think Simplified = More understandable?

[@piyawathKKU]

Why the simplified one is less understandable. This argument doesn't make sense.

[@user-ri9oi6vy3x]

30:00 37:30

[@TheBigBanggggg]

The optical amplifier (at the end of the video) should only be mentioned, not explained. The explanation here is very bad (from here on: 55:53).

[@user-ri9oi6vy3x]

7:24

[@parsonman05]

My big question is why and who this like this video?

[@mrNanoDhruv]

24:05

[@curryeater259]

Please don't dumb down the MIT video;s, I would like to learn like a real MIT student would. Thanks

[@maskedmarvyl4774]

He seems like a nice person. I enjoyed part of this video. But his explanation of temporal coherence at 12:23 is a complete fail. When he starts getting into tau and f0, delta f and "delta width being very close to zero", he does not explain any of it; after saying at the beginning that he will be explaining these concepts as he goes along. He is making the typical mistake of a professor in teaching concepts and procedures to students who he assumes already knows them. If you're getting into lasers without already having the background in math, and exposure to frequency and oscillation concepts that he assumes, you're going to be very frustrated by this video. Before you assume it's your fault you can't understand it, I suggest that you check out other intro to optics and laser videos.

[@brendawilliams8062]

It depends on your field of interest. Check out what is used there.

[@dozog]

I agree with you. The way he explains temporal coherence and how it is a property of lasers, in the paragraph dealing with spectral line width, does not make sense.

[@dozog]

More generally I think this presentation does not have a clear audience in mind. The introduction is very very basic level (not technical at all) and then it goes to phase jumps in the atoms and divergence of a diffraction limited focused spot?

[@MrJasoncool66]

im 14 and i can understand 50-65% of this

[@rigeleisenheim8860]

now you are 19. how much can you understand?

[@acuseme]

it's so simple, it's complicated...no...just no...

[@zenozip]

This guy LOVES to ramble on... Can't he just skip the small talk and lay out the information in concise points? Or demonstrations..?

[@SuperRinocicorn]

I KNOW RIGHT?! There are way too many things wrong with this presentation and it makes me so mad 0_o He makes it sound SO much more confusing than it would need to be if the presentation of the information was more coherent and comprehensive. UGH. This presentation made me SO MAD for some reason. Also some of the notation in the graphs was pretty subpar and DEFINITELY, EASILY could have been better. Also, a lot of the time it really frustrated me that the information was presented in such a detached and drab way; this kind of stuff should be presented in an EXCITING way, to reflect (ha...reflect) how freaking COOL it all is!!! It should be presented in a CONCISE and ACCESSIBLE way in order to convey the coolness of lasers. It should be presented in a way that more people can understand and internalize.

[@nuclearcasserole]

make a better video, post the link

[@wilsonadams1183]

This is literally one lecture of an entire course on the FUNDAMENTALS of lasers.... its a physics course at MIT. He's going to go into detail on it, because lasers are actually fairly complex physical systems. Laser discovery won a Nobel Prize for a reason. What were you actually expecting?

[@jacobvandijk6525]

In general, academics can't teach. For most of them it is a necessary evil.

[@UPAKHOSALA]

Too much calculations and technological jargon , make it simple as it was in beginning

[@billyboy8888]

this video looks like its from the 90's maybe even 90s....... why not make some newer ones.....

[@Krimson5pride]

Things are still the same. You will get the necessary to establish your basics.

[@govorilegko]

if it is the good education then I am Hancock

[@h7opolo]

Absolutely terrible lecture

[@gobuwako3993]

nice lecture

[@RbtV92]

Thank you.

[@ajinkyasinhrajput1460]

very nice thanks you

[@s.n1929]

7:24

[@s.n1929]

7:54