The Laser Shifting Polychromatic Acousto Optic Modulator
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- Опубліковано 23 чер 2024
- In this video I'll be exploring a Polychromatic Acousto-Optic Modulator (PCAOM). This device is more or less a special prism that can shift the angle of light going through it using several underlying physics. Inside a crystal pumped with sound waves in the Mhz range using the piezoelectric effect. This causes wave in the crystal which compress and expand regions in the crystal as the sound travels through. There is a difference in refraction because the electrons behave differently and will cause optical interference to happen in the crystal which diffracts the light and it leaves the crystal at a different angle. This is a complicated subject and there are many kinds of acousto-optic modulators (AOM). They are used for modulating a laser beam's intensity, for mixing colors, and for q-switching and so on.
Here are some good videos to watch which get deeper into the types, maths and mechanism of actions in the crystals.
• EC469: OPTO - LEC21 - ...
• Video
Reading material for more information.
www.optoscience.com/maker/goo...
patents.google.com/patent/US4...
www.findlight.net/blog/2017/0...
www.rp-photonics.com/acousto_...
RF Amplifier IC MHW6342T Datasheet
www.digchip.com/datasheets/pa...
Adam's video and eBay store.
• NEOS PCAOM Crystal Cha...
www.ebay.com/str/hightechstuff2 - Наука та технологія
I'm picky about adding only the most relevant content to playlist selections. But the fundamental physics beautifully demonstrated in this presentation landed this video in my top list of required viewing for advanced photonics and propulsion! So awesome.
Damn right! This dude is a wealth of hard to find photonics information.
Awesome! AOTF's are great fun! Coincidentally I have just finished prototyping a driver for an AOTF just yesterday. Just waiting on a case to arrive.
They are great fun! Have you seen the KTN deflectors that i think can move a beam linearly like a galvo?
www.ntt-at.com/product/ktn_deflector/?fbclid=IwAR2b9pThF9nwbuTeIyyG1P8qtYRUfkBwYhw5f7lKoZVFnwMVugWdVDMlYfk
@@Zenodilodon wow! 100kHz scan rate :O
@@Zenodilodon sweet! Would love to get my hands on one of those! In fact, a pair, I would imagine you could project a video image with them!
Great video, I've always wanted to see one of these in action. There's just not enough videos out there showing this kind of equipment, what it can do and how it operates. Keep it coming and thanks ever so much!!
The material in the crystal is called Tellerium Dioxide. Dont touch the crystal. Tellerium Dioxide is hygroscopic (absorbs water readily). Dont touch the crystal with pretty much anything since the crystal is brittle. A fun thing to try is to "collimate" a white L.E.D. and pass it thru the Xtal and adjusting the angle to get different colors out. Awesome video!
Thanks for the comment! But I have to point out that Tellurium Dioxide is probably not hygroscopic. My fist indication of that is the lack of seal around the actual crystal. This would easily let in atmospheric moisture in of itself. I did also check the solubility characteristics. It appears to be soluble in acids and alkali solutions. It's solubility in water is negligible from what I can find out. I would love to see a white LED effected by the XTAL, I tried to see if any visible effects where noticeable just as it is with the cover off and didn't see much. If you ever do the experiment again do take some video!
i used to use the dump beam from my 8 channel Neos PCAOM for a second set of scanners ,i also aimed via fs mirror a helium neon from the rear of the argon laser straight through the tube to the PCAOM CRYSTAL did a good job
Good demos. Thank you!
Everything all heatsinked up! Love it!
It's a " Cool " set up lol
LOVE THE INTRO
50:35 I opened a similar component once and it appeared to be a transformer or other inductor, it had multiple copper windings. Excellent overview, thanks!
Makes sense, in some ultrasonic things there is often an inductor that is I think in parallel with the transducer. I see this a lot in ultrasonic disruptors/homogenizers as part of the LC network that plays in tandem with the PZT element. What was the device you opened for?
@@Zenodilodon I don't know what it was, I got it to scrap, but it was some kind of RF board. It had several of those mini coax connectors on it.
Used to use those for a white light ArKr laser in the way back days of laser light show animation. Now its direct diode and they can stuff it all in a box that is about the size of a pack of smokes, run it off a battery or USB or WiFi.
You'll be pleased to know there are many of us who still enjoy gas lasers. I recently got an Omnicrome 643 ArKr yellow-blue and plan to swap out the HR and OC for while light. Direct diode has convenience but It's never going going to be next to impossible to beat the quality of a gas laser.
Nice desk!
I swear you need to be working in some major research lab, your ability is wasted on the work they make you do!
Your friend is selling a lot of interesting things I'd never be able to afford 😂😭
It is a nice desk, if only I could keep it that way lol.
I may get to the point of working in or running a lab. I could see it being a lot of fun!
Yes, he does sell some nice stuff! It's a whole world of learning experience and seeing neat things every time I go there to work on things.
Nice unit! I've been wanting to pump my wc300 white line into one for yrs
We're on the other side of the problem here. The Coherent Model 52 Ar-Kr white light needs regassing.
Can you do beam steering with it?
No, these can only move a beam within the positions of the orders of diffraction at fixed angles. There are devices that use liquid crystal stacks and can do beam steering but they are limited to a single color range as of now.
I tidy desk is the sign of a linear mind nothing new ever came from such a mind, Go non linear thinkers Go!!!!!
That's why I have all sorts of stuff in the desk too lol. It gives the illusion of working on cool stuff even when I am not. It's also an instant reference to ideas to solutions or ways of doing things I might not think of. In this case you can see that clearing the desk was vital as i needed all the room for the set up, I'd like to keep it cleaner but that is an uphill battle of will power vs entropy.
@@Zenodilodon 🐱👤
Lmao, I'm shocked you didn't pass out vaping that fog rather than use a fogger. Lol
lol, oh I know right, thank fully 0 nic is an option. I figured it would be easy, a puff and it will be good for a while, but nope that Ar-Ion circulates air like a Boeing 747.
@@Zenodilodon Yeah, the fan on mine is very obnoxious. If i ever set it up in a permanent location i'll most likely plumb her cooling in a quieter fashion.
I have an 800w fogger for my showings but i prefer not to use any fog if i can help it, it's not good for the open optics i tend to use. :/
I used to watch the colours of bubbles I'd make with soap and when the colour was about all gone the bubble would always busrt
You should read Opticks by Isaac Newton, he writes about soap bubbles like I wish some one would write about me.
@@Zenodilodon guy can't even spell 😂 (maybe some day!)
For a sec I thought the title said "illudium q-36 explosive space modulator" :-P
With enough energy it could be!
Why you call the ceramic capacitors resistors 😅 you crazy
Which ones are you speaking of?
@@Zenodilodon part of the inductor/capacitor circuit