Cryogenic Laser

[@skivvy3565]

Love the modest mouse intro. I’m so glad I started looking back at your older videos

[@friskydingo5370]

Absolutely one of my favorite bands and one of my favorite youtubers in the same video Absolutely love the intro 😊

[@willthomsen7569]

Crashed my car into a COP CAR, the otha day…

[@friskydingo5370]

Wow 10 years of videos congratulations 🎊 I'm going to binge them all from the beginning 😊

[@TechIngredients]

Yay! Thank you!

[@friskydingo5370]

You guys are super amazing my hat's off 😊

[@RoboBeaver6]

Loving your channel. Do you have, or can you do a video that tells us a bit about your background, education, how the hell you have so much cool stuff, and how do you manage to afford it ;) Is that a workshop in your house, or your company lab space? seems like a lot of expensive kit close to hand.

[@Julius314159]

I too am curious about your formal training & educational background. Please share!😊

[@ericcameron760]

sorry to be off topic but does anyone know a method to log back into an Instagram account? I was stupid forgot the password. I would love any assistance you can give me.

[@ericcameron760]

@Maverick Francis I really appreciate your reply. I found the site through google and im in the hacking process now. Seems to take a while so I will get back to you later with my results.

[@ericcameron760]

@Maverick Francis it worked and I actually got access to my account again. I'm so happy:D Thank you so much, you saved my ass!

[@maverickfrancis5933]

@Eric Cameron you are welcome :)

[@weinihao3632]

It would have been very interesting to see the diffraction pattern, starting at orange, slowly moving back to red in a time lapse record!

[@thelastviking2039]

I’ve been binge watching you videos in the series you have, but I might as well start from the beginning till the end!

[@stefengullicksen314]

Feeding the algorithm thank you so much for what you do so many of my projects have been improved with your techniques.

[@hackupboulders]

What in the world was I doing with my life while you were doing this!!! Love ALL of these videos! I watch every one through to the end!

[@ronniepirtlejr2606]

You are the Coolest guy I have never met! Thank God I found you on here! :-)

[@TechIngredients]

We're glad you did!

[@RoboBeaver6]

as soon as you turned off the lights, the camera finally showed how orange it was. I guess the camera has some automatic colour correction.

[@meandnoother]

22:49 Notes that the window temperature is getting pretty low. "If I back off a little bit in the rate that I'm flowing in more liquid, it shouldn't get too cold." Proceeds to flow in even more liquid at 23:46, 24:29, 25:28 and 27:19, then notices the window temperature has gone way down! :D

[@suzesiviter6083]

If you could use temperature cooling say using Peltiers and heaters to sweep the wavelength, then attach a fibre bragg grating to the laser, you could detect chemical changes effecting the refractive index of the fibre cladding. For applications such as detecting corrosion in reinforced concrete. I looked into shifting wavelength this way myself years ago, unfortunately we did not have labview or the optics equipment to make a successful research paper. However looking at your research (so far) it seems the wavelength shift is quite small vs. temperature, I believe a typical 40w peltier can only create a temperature differential of 30deg, so it was perhaps impractical looking back, Interesting thanks.

[@duggydo]

I've been skipping around watching your videos randomly based on what looked interesting. Well, they seem to all be interesting. I just decided to sort by oldest and go from there. Really good content. 👍

[@Darieee]

Is there any way to get to the older videos mentioned in this one ? From my view this is the oldest one uploaded to this channel - and, having seen all of them down to now .. would really be in need of some more xD

[@IDoNotLikeHandlesOnYT]

I think this might be one of them, though it's posted more recently: Wavelength Division Multiplexing kzbin.info/www/bejne/i3aQaGZ7jLqUptk

[@seting9159]

Just a comment for the YT algorithm, love this channel.

[@machobunny1]

With all the data being measured here, it would be very straight forward to plot the temperature, wavelength, power curves using Labview. That would make seeing the whole story so much easier. As I am sure you know, you need a decent multi-channel A/D data logger. I recommend MARS LABS in Laurel, Maryland. Great systems, easy to use, very low noise. Beyond that, I do not understand the significance of the 2-D diffraction grating part of this. What is the purpose of the beam combining, polarizer, etc. ? We understand that a 2-D grating should (and does) produce a spatially periodic 2-D diffraction pattern. We see that. It is lovely and I love it, but I didn't go to school the day they told us how that would be significant in this testing.

[@TechIngredients]

The beams can be combined with a polarizing prism, as long as their polarization axes are perpendicular. This is frequently used to double the available power of two smaller lasers.

[@oceanhouse8080]

Need a diode at room temp to compare the color for the camera... Its very hard to tell from the video....except for the end that was awesome....

[@TechIngredients]

Thank you

[@YodaWhat]

@Tech Ingredients - You seem concerned that dichroic filters made for red light will not work with orange light. But dichroic coatings have a wavelength shift with ray angle, as the light path gets longer as rays move off orthogonal. Seems to me that for red-tuned dichroic filters you have only to angle them a bit and they will work for orange light, albeit with increased reflection loss.

[@TechIngredients]

No, that wasn't my point. What I meant is that at the time this video was made orange diode lasers were unavailable, and even now they're rare. In order to display an "orange" beam you had to transmit a beam that was actually a mix of two other colors and a dichroic filter or a diffraction grating would separate them. This can't happen if the beam is a monochromatic orange.

[@davidrouse3157]

I am kinda ocd I picked up a Coherent Labs Commercial Laboratory Bench Laser It has following features. It looks like a large high end audio amplifier, it has a huge thermoelectric cooler with forced air cooling. There are 4 mounting areas for 4 Coherent or other typically up to 40 watt 808nm fiber output laser modules it can either take fiber laser modules either like yours or Coherent Labs ttpically 25 or 30 or 40 watt laser modules with their own individual Peltier thermoelectric coolers. I have both a smaller and larger gold plated bridge with a thermister that are round at base to mount KTP or Nd:Yvo4 etc. Type SH, crystals in a pinch clamp between 2 pillars I can only assume they were producing 10 to 20 watts of 532 or 1064nm output. I dont know if they were used with basic single ended pumping versus dual sided diode laser pumping as well as maybe Q switching etc. But

[@Archeopterix2680]

This was very fascinating. Thank you for posting it. I've heard of blue shifting diode lasers by cryogenic cooling before but never seen it demonstrated. I've also heard you can cause the diodes to self destruct this way. Have you ever done this? If so could you briefly describe the circumstances it would happen under? Thanks.

[@hoofheartedicemelted296]

Manipulating light with temperature. Amazing. If I may sir how did you determine the spacing between fixtures ; laser holders, mirror holders? The familiar honeycomb aluminium plate is evident on the laser table below. It seems absent on the upper laser plate. What was your guide to the measurements to affix the aluminium laser holders? Thank you sir.

[@suzesiviter6083]

Man you have better equipment than some universities.

[@jgarris0577]

In a world where we don't know who makes our clothes, dry cleans them, produces our food, etc. Watching THE PERSON in THE ACT of making this happen is so mind blowing.

[@greatestever2451]

Thank you Ive been watching for a few years I'm watch all videos hopely i understand more

[@stefanofenech2473]

Absolutely beautiful setup, Great description of what is going on :D

[@TheExplosiveGuy]

That's awesome, orange lasers are rare. Now we need to figure out how to make that in a hand held version. I'm trying to collect the rainbow in laser pointers and orange is a tough one to find. Cryo cooling is awesome, there are some amazing things that can be done with it, both for science and fun. Such as shifting a red laser diode into the orange spectrum, or filling a plastic water bottle with an inch or two of liquid nitrogen and taping an industrial blue rubber glove (can't remember the name of the material, the ones that balloon out about 4 feet long and 2-3 feet wide and pop like a gunshot) over the top section of the bottle before it condenses water on the surface for a good bond. Takes about 5-10 minutes until critical mass is achieved, so be sure to place it in an inconspicuous location. Best when placed near unsuspecting coworkers, unruly children, your boss, or good friends.

[@beautifulsmall]

I do love a good variable wavelength transmitter / reciever interaction. new particles ? how to detect ?

[@hoofheartedicemelted296]

Is it possible to source a {BaTi 03} Barium Titanate crystal, that is thicker than 1mm sir? I want to realise a PCM sir. Also, how did you choose the correct monochromator sir? Is there a way to determine if a phase conjugate mirror is present sir? Thank you sir.

[@saitavr]

Nice to see you again!

[@waynepayne864]

idk why but watching ur videos makes me feel like ima be put on an FBI watch list i love it

[@CardShark1015]

Have you done any work with the C-Mount 622 diode? They operate at 5*C and output 150mW. They are very finicky from what I hear, but I plan to try them out around the August-September time frame.

[@alexandrevaliquette1941]

I'm always amazed "Doc Brown" Ref..back to the future

[@chrisbaldwin6244]

Love all of your videos, We all need more engineers in our lives.

[@davegeorge7094]

What a LASER fanatic. Cool!

[@shazzz_land]

the difraction grating thing if used in reverse it can somehow concentrate widespread light into a narrow area?

[@TechIngredients]

Yes, but the wavefront has to be a perfect inverse of what comes out of the grating on the first pass.

[@mastersheef4300]

think the dropped amplitude at 20:"and somewhat" correlates to the lower frequency as they "carry" more energy as larger wavelengths ... and therefore you lined up the cos-filter.!?!... what has that cos-thing to do with that- nothing mechanical?- to me it looked just like a zoom in or new alignment of the x- and y- chart like an amplification?? ... sry

[@andymouse]

Fantastic, you have re kindled my love of this subject.

[@TechIngredients]

Great!

[@daCount0]

The picture links do not work anymore.

[@stdorn]

I so wish I knew you could do this 2 months ago before I sold my sterling cycle cryo cooler.

[@TechIngredients]

We have one here that is rated at 2 watts. It would be interesting to see if these could actually operate near 0 K. This could be a good experiment when we construct the vacuum system.

[@stdorn]

After thinking about it cryo cooler I had may have caused vibration problems

[@stdorn]

I got my cryocooler to attempt to make liquid air but it just didn't have the cooling wattage to work using a .5L dewar my thermal loss didn't allow me to reach nessicary temp. It was disappointing since It cost me $1200 bucks for. Luckily I got a decent resale value on it. I did make a working cloud chamber while I had it using 99% isopropyl.

[@stdorn]

I cant believe all the vids I watch like this you have been on youtube for 5 years and I just found your vids today. Thanks for taking the time to make them.

[@oceanhouse8080]

Can you UV shift a 405 or a 445 doide ?

[@TechIngredients]

The GaN diodes blue shift very little with temperature, as in 1nm/20C. However, the efficiency increases substantially with cooling.

[@davidrouse3157]

The Coherent 4 fiber laser bench unit has 4 fiber whips that screw onto tediously meticulously cleaned connectors. They create or can create a consolidated single armormed jacketes fiber ourput with a large knob like a huge audio amplifier potentially delivering up to 160 watts output over one fiber . I would like to with knowledgeable assistance and guidance like to create a professionally designed 532nm laser. I have one huge Crystal thats 12.5mm square by 20mm long. The large crystal bridge has a 👍👍👍👍👍👍👍

[@davidrouse3157]

Anyhow I am kinda of a wanna be sky projectionist on clouds at night or a large projector screen. I have built a few green laser projectors using galvonometers and a 50mw 532nm laser driven by a Pangolin laser projector. I have a few odds and ends uncommon hoarded technogear. The large crystal bridge looks to be about 2x2 to maybe 3x3 by 5 to 6 mm and came out of some dpss Coherent Laser. I have several New in Box Crystals that are probably KTP or Nd:Yvo4 I have several huge brick TEC units with no controllers and fiber laser modules like in your video.

[@davidrouse3157]

I also have a few SDL fiber laser boxes I think are 808nm. And probably about 18 watts each in addition I have some type photospectrometer with slit ipenings and a mechanical micrometer that works with a prism.

[@davidrouse3157]

Also 2 different TEC controllers. Also I have one continuum model SHG T-2 20mm I believe maybe a Q switch It might have suffered a catastropic thermal failure but maybe ?? I already have a usable new crystal as well as for one or both coherent crystal bridges. I have a weird 4 cooling circuit cryogenic tissue freezer that does minus 69C type medical tissue freezer used before nitrogen could be easilly had, also have a single circuit laser water chiller with old school gallon tank compressor and pump not probably good enough for tuning 808nm laser frequency just for keeping medical or industrial cutting welding laser like my 30 to 40 watt coherent rectanglar lensed medical lasers from burning up.

[@YodaWhat]

Why are IMAGESHACK links asking for a login?

[@nataraj.m.v8209]

Awesome experience and explanation..🎉🎉🎉...I would like to know about the professor name..

[@TechIngredients]

Eric

[@Pillgar]

This is amazing!

[@davidrouse3157]

I have a rather expensive looking laser mounting board its black a few inches thick and about 36 inches square it has a grid patteen of female 1/4-20Tpi holes that are about an inch or so apart. I have maybe a dozen or more 808nm laser modules with huge brick Thermoelectric coolers. I also have several 30 watt water cooled medical laser modules that are rectangular with gold plating anode cathode terminals and a water cooling inlet outlet hose bib. I used to do for shame devesttation of black shoes in front of a fan that literally exlpided in flames I picked up a crude but effective 100 plus amp variable low voltage bench rack mount 0 to like 3-6 vdc power supply.

[@nataraj.m.v8209]

May i know the professor name..

[@dentonfender6492]

I've watched Styropyro's Laser experiments, and he wears Laser safety glasses, and warns constantly about the danger of blindness when experimenting with powerful laser diodes. I notice you are not wearing safety glasses to protect your retinas from possible reflected laser light. I know you are safety conscious, and was wondering what you are doing different here?

[@TechIngredients]

Actually, I have a little more experience. When working with low power diode lasers with their large divergence, the requirements decrease. In addition, the protective eyewear can be a problem because you can't see the beam you're working with. That being said, take a look at our video from around this same time that I did on laser safety.

[@timk.1395]

I have been watching Tech Ingredients and Applied Science videos so much I practically feel like I'm a scientist. At least in my imagination. : )

[@foot2]

Who is the host of Tech Ingredients?

[@TechIngredients]

Me.🙂

[@foot2]

@@TechIngredients Foot laughed out loud. Good for you keeping a low profile. Excellent channel. Thanks for posting.

[@Barnaclebeard]

"Other videos?" This is the oldest one presently on the channel. Is there a previous channel?

[@TechIngredients]

Not yet. The videos we posted prior to this we're to support a small forum group discussing lasers. They were too narrow cast.

[@Chrissy4605]

Impressive!!!

[@yelloww9822]

Very interesting

[@suzesiviter6083]

I would be really careful about the lasers, even a slight reflection from say the mist from the nitrogen may be doing damage, I know my eyesight deteriorated significantly after working with lasers

[@machobunny1]

It seems pretty evident to me that any potential hazards from the beam have been very professionally eliminated. I've done this all my life too. Relax. It's OK.

[@suzesiviter6083]

@@machobunny1 That's just what Custer said before the Indian encounter)

[@weinihao3632]

@Suzy Siviter Could you describe in a bit more detail in which way your eyesight deteriorated? Did you lose sensitivity in your macula? Or did your cornea/eye lens/vitreous humor suffer some damage? Does it differ from one eye to the other? How does the visual cortex cope with the missing information from laser damaged eye? Do you see a certain fixed blurry pattern? Did the perception change over time as the brain adapted to the damage? With what kind of lasers did you work and what experiments did you do? I also agree that one should be extremely careful with lasers, even more so when they are invisible.

[@suzesiviter6083]

@@weinihao3632 Hi Wei, yes you would expect loss of information from burning the retina, however although I cannot be 100% certain, after that time my optical vision jumped from a 2 to 5, maybe if the light strikes it at the right angle it can lead to deformation of the lens. I know I used to suffer from headaches after working in the lab. Its in my right eye, yes after a time my vision sort of self corrected but I still have blurry vision when reading especially in a morning-perhaps when its at their dryest. We used to do research on Fiber Bragg Gratings for chemical analysis on corrosion.

[@darkslayer6911]

3:55 was that a fart ? 😳☺

[@TechIngredients]

Unlikely

[@oddjobbobb]

I’m not a scientist. I’m only here really for the booms and bangs of hydrogen explosions and the roars of jet engines. Is there a reason for going so slow introducing the liquid Nitrogen?

[@oddjobbobb]

Hahaha, sorry to ask the question before finishing the video. Moments later you said why: do the window doesn’t frost over

[@watts-jake]

best intro music...

[@robertpalumbo9089]

New fan subbed 2020

[@TechIngredients]

Thanks!

[@CardShark1015]

I'll message you my email, I am very interested in this. I have a couple TEC ideas planned for the months to come.

[@davidwilkie9551]

Interesting

[@drrota]

WOW - this is deep science - amazing... safety goggles?

[@oddjobbobb]

Don Rota safety smaftey

[@mikeconnery4652]

That was interesting

[@TechIngredients]

Thank you!

[@mrjaz666]

9:03 I feel like showing that computer's IP address is not the best idea.

[@YodaWhat]

It is an internal LAN address, and behind the firewall of a router. It is safe.

[@YodaWhat]

@David Taylor Ya, that's kinda what I said.

[@trailblazingfive]

Wow

[@westganton]

.10 subnet, nice

[@nicolatesla8401]

Hello

[@oddjobbobb]

What a cool job you have. You have a five gallon bucket of liquid nitrogen in your garage. I want yo be you! Oh, no pun intended.

[@jameslafayette3866]

Romans 6:23 esv For the wages of sin is death, but the free gift of God is eternal life in Christ Jesus our Lord. #TurnToChristAndLive

[@khaled861991]

Hello sir, I have question for you which I can't ask publicly can you send me please contact? Thank you so much

[@Pillgar]

This is amazing!