Tech Ingredients - 2013-06-17
A unique low temperature wavelength shifted multiple diode laser source. http://img823.imageshack.us/img823/4534/dsc0659fm.jpg http://img854.imageshack.us/img854/9815/dsc0658mc.jpg http://img194.imageshack.us/img194/5970/dsc0660gk.jpg
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
I think this might be one of them, though it's posted more recently: Wavelength Division Multiplexing https://www.youtube.com/watch?v=UE-73EWUapw
You are the Coolest guy I have never met! Thank God I found you on here! :-)
We're glad you did!
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.
Absolutely beautiful setup, Great description of what is going on :D
I'll message you my email, I am very interested in this. I have a couple TEC ideas planned for the months to come.
I’ve been binge watching you videos in the series you have, but I might as well start from the beginning till the end!
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.
It would have been very interesting to see the diffraction pattern, starting at orange, slowly moving back to red in a time lapse record!
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. : )
Love all of your videos, We all need more engineers in our lives.
Fantastic, you have re kindled my love of this subject.
Great!
What a LASER fanatic. Cool!
Nice to see you again!
best intro music...
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.
I so wish I knew you could do this 2 months ago before I sold my sterling cycle cryo cooler.
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.
After thinking about it cryo cooler I had may have caused vibration problems
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.
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.
.10 subnet, nice
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.
WOW - this is deep science - amazing... safety goggles?
Don Rota safety smaftey
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....
Thank you
Why are IMAGESHACK links asking for a login?
Can you UV shift a 405 or a 445 doide ?
The GaN diodes blue shift very little with temperature, as in 1nm/20C. However, the efficiency increases substantially with cooling.
@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.
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.
New fan subbed 2020
Thanks!
Man you have better equipment than some universities.
Wow
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.
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.
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.
try to compress your videos into 10-15 minutes
I don't think we can.
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.
9:03 I feel like showing that computer's IP address is not the best idea.
It is an internal LAN address, and behind the firewall of a router. It is safe.
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?
Hahaha, sorry to ask the question before finishing the video. Moments later you said why: do the window doesn’t frost over
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
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.
@Doc Moore That's just what Custer said before the Indian encounter)
@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.
@Wei Ni Hao 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.
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.
You could absolutely do that yourself, you'd just need to find yourself a large enough Dewar and a supplier willing to sell that much to you.
Or you could just DIY yourself a liquid nitrogen generator. You'd still need a dewar or some other way to store it.
https://www.youtube.com/watch?v=7PWESWqhD8s
https://www.youtube.com/watch?v=upuxp3OowbY
https://www.youtube.com/watch?v=A_mJNzPsnTg
https://www.youtube.com/watch?v=dCXkaQa53QQ
RoboBeaver6 - 2019-10-31
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.