Very impressive I am about 6 months into learning everything I can about lasers in a slightly different manner I will be using components and free space lasers already manufactured just modifying them for my intended use. I have to admit until recently I didn’t understand any of the terms you used but since I have taken the time to read a few books and had the opportunity to question several individuals knowledgeable in the field I am starting to understand everything and I can picture how it works as you explain it. I have only found a handful of good resources on the internet for someone who previously had no formal education on the subject.. I hope your willing to share all your knowledge I know it must of been pain staking and timely to learn or find that information but I know I would greatly appreciate it and I would in return share everything I have learned with anyone diving into the field.... surprisingly one of the hardest things to find on the internet is how to handle and operate high power lasers safely.. you would imagine that would be something easy to find information on..

very clever making convex mirrors out of available concave stock! great way to engineer your way out of a shortage. I smiled when I heard that. keep it up :)

watching your laser vids reminded me of a He-Ne laser that i found in our university refuse pile. as a physics project i offered to try and resurrect it. mirror mounts were all bent and dusty, power supply was not working. after fixing them, i started adjusting the optical resonator with a green laser to make sure that mirrors are perfectly parallel. and you can imagine my joy when at some point dim green beam point that i used for alignment suddenly turned red as it started lasing

Thank you for sharing this information. I have learned a lot about laseroptics from this channel. Kind regards / Hampus - Sweden

I slept thru most of my physics classes. But i have no problem listening to you go on and on. Where were you when i was in school !

Full of great information, as always! Thank You.

Nice. best laser I had was an argon-ion 600mw laser at around 480nm. The power supply was massive, as expected for the late 1980's. The blue beam was absolutely beautiful.

Very informative again! I liked the description of evolution of your various technics to reduce or eliminate or compensate the thermal lensing effect. This make me wondering if in the industry, if they design the cavity itself to compensate that effect by making progressive inner diameter of the tube to the middle lenght..?

Excellent explanations!

So the Dye cell becomes a GRIN lens en.wikipedia.org/wiki/Gradient-index_optics with the added entertainment of a changing index of refraction gradient over time / temp / or other variables. Fun..

I'm born in 1966 so of course i have to love lasers (and Star Trek) ... :-)

Good work

Loving these videos. Can't wait to see the laser in operation! Approximately how much power does this laser generate during normal operation? I believe you mentioned 50 joules per pulse previously, but I don't know (or recall) the pulse duration so I can't convert to Watts.

thank you.

you are awesome,i try to understand everything you are saying and sometimes i learn the meaning of certain terms thx to the way you talk about them or describe it,,what kind of work do you do or is this juts a hobby? what is your background?

Cool, we had a 100 mj per second to 2000 mj per second Nitrogen laser so we used a 5 mw of Neon Helium laser. I built a 100 mj per second 337.1 nm Nitrogen laser in Photonics and built a Nitrogen laser UV spectrometer for chemicals.

I've always been fascinated with optics but I found it's a very difficult topic to learn anything about. I'd really like to learn what I need to know to work out the specifications of the lens and where to stick it to achieve the desired result. Any chance you could recommend a book?

Sparkle, shimmer, & shine. Glimmer, glimmer. Flash....ZAPPP!!! Sparkle plenty. I saw the light, lord. KAZAKKK!!!

"A laboratory accident away from a supervillain."

Was there a specific application for this laser? Doesn't this really long cavity require often realignment? Impressive.

They are trying to explain this electron acceleration as some kind of diffraction. A visible laser cannot accelerate electrons in the direction of the travel of the laser beam according to some sciencevsettled back in 1979. But if two electrons accelerated perpendicular to an laser beam focus collide and bounce in opposite directions with great enough acceleration they will create two xrays in the direction of the travel of the laser beam which can then accelerate electrons in the direction of the travel of the laser beam according to Compton scattering.

Tech in gradients

One question about using concave dielectric coated mirrors in reverse to get a convex mirror: Damage threshold is significatnly lower because of the carrier substrate (quarz) that needs to be passed right?

I think I missed something, why not using a very low power laser pointer for the alignement beam? (in the beginning of the video)

how about using diamond pin hole? thats what they use for high energy beams or femtosecond laser ,or if they have mirrored

i don't understand how your concave mirrors function as convex, because the beam has to pass through back surface of the mirror, then after internal reflection pass through back surface again to escape it, right? but the whole point is to have first-surface mirrors that don't suffer energy loss in all those extra medium-medium transitions.

Plz complete daigram on this project .daigram with itredigent to helpfull to understand

Just a thought, and if this is an original one please quote me on the patent. Since you're using pressure as a trigger why not put a spark gap in a resonator chamber with a speaker? Then you can trigger a rapid change in pressure with a simple sound pulse! It 'sounds' like it would be a very rapid , predictable and reliable trigger setup.

If you wanted a low powered laser to operate at 400hz, how would I go about it? Would I purchase a specific laser or would it be cheaper to build it myself? Thank you sir.

Can you share your mirror vendor/source? I been shopping for 2100nm OC mirrors, only found two sources, too pricey. Are you using FS(fused silica) material?

If you send the outgoing pulse again through the new similar but different setup what it will be its consequences.

What is a "Plain old, Plain old cavity"?

Really interesting but can you turn it on and pop a balloon or burn a hotdog please?

And what is the purpose of that laser?

Microradians? I think I just lost a few brain cells thinking about that one lol. What would the MOA (minute of angle) equiv. of that be?

Speaking of gas atmospheres, I was watching how MIT was producing graphene using a hydrogen atmosphere a copper sub straight and a oven to bake on the carbon to the copper using an oven. Why don't they use a laser instead of an oven?

You and Styropyro need to get together.

Raman spectrometer, please! :-)

Only 10869 views ATM. Where is this world going to?

Let's be pals. We will steal the moon!

I swear, putting the word "laser" in the title is just like Chekhov's gun. If you say it's a video about a laser, you have to FIRE THE LASER!

I support law enforcement and this is a crime.

Talk ... talk ... talk .. and only at the end does he say this is the second video where I don't tested it ? Should put a link to the first video , we can just SEE what happening rather then take 18.00 to explain it . (friendly tip ) he's gota have 150K $ wrapped up in test equipment and hardware !!!

You know why boys quit school before they graduate ? Because teachers are boring ! Boys are practical and manual ! You can talk about you laser for hours ! If you don't show "practical" stuff you lose me !