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Les' Lab
United Kingdom
Приєднався 3 вер 2012
I am an Amateur Scientist inspired by the old Sci-Am articles of the same name!
I build home-made Lasers, Electronics projects, Computers and am interested in Chemistry & Physics, and publish these on UA-cam.
Support on UA-cam has enabled me to share my work with like minded people, get one of my creations published in IEEE Sensors Letters, and even design and build a Supercontinnum Laser at home and on a budget, for what appears to be the first time!
If you found this content useful, and would like to support this Channel, please consider supporting this work on Patreon: patreon.com/leslaboratory
Or donate directly: paypal.me/leslaboratory
Alternatively, please share this content on your social media platforms, it really helps me out!
Contact: lesliewright1977@gmail.com
I build home-made Lasers, Electronics projects, Computers and am interested in Chemistry & Physics, and publish these on UA-cam.
Support on UA-cam has enabled me to share my work with like minded people, get one of my creations published in IEEE Sensors Letters, and even design and build a Supercontinnum Laser at home and on a budget, for what appears to be the first time!
If you found this content useful, and would like to support this Channel, please consider supporting this work on Patreon: patreon.com/leslaboratory
Or donate directly: paypal.me/leslaboratory
Alternatively, please share this content on your social media platforms, it really helps me out!
Contact: lesliewright1977@gmail.com
What happens when you reflect a Laser beam back on itself?
Episode 63
#laser
#electronicscreators
What happens when you reflect a Laser beam back on itself?
This unusual Laser system from a Particle Counter does exactly that!
Why?
how does it work?
Let's find out!
Sams Laser FAQ The PMS/REO External Resonator Particle Counter HeNe Laser
www.repairfaq.org/sam/laserhen.htm#henish7
External Passive Cavity Laser patent:
patents.google.com/patent/US4594715A/en
Previous teardown of the Laser Particle counter:
m.ua-cam.com/video/oUM1OD_WWgM/v-deo.html
Check out my other videos: ua-cam.com/users/leslaboratory
Please don't forget to like, subscribe and comment for more great content!
If you found this content useful, and would like to support this Channel, please consider supporting this work on Patreon: patreon.com/leslaboratory
Or donate directly: paypal.me/leslaboratory
Alternatively, please share this content on your social media platforms, it really helps the channel!
0:00 Intro
0:12 Helium Neon Lasers!
0:53 Brewster Window Laser
1:46 Unusual Particle Counter Laser
2:44 Sam's Laser FAQ
4:02 Patent External Stabilized Passive Cavity
8:25 Laser Teardown
9:05 Optical Bench Setup
9:45 Laser Demo
12:43 Credits
#laser
#electronicscreators
What happens when you reflect a Laser beam back on itself?
This unusual Laser system from a Particle Counter does exactly that!
Why?
how does it work?
Let's find out!
Sams Laser FAQ The PMS/REO External Resonator Particle Counter HeNe Laser
www.repairfaq.org/sam/laserhen.htm#henish7
External Passive Cavity Laser patent:
patents.google.com/patent/US4594715A/en
Previous teardown of the Laser Particle counter:
m.ua-cam.com/video/oUM1OD_WWgM/v-deo.html
Check out my other videos: ua-cam.com/users/leslaboratory
Please don't forget to like, subscribe and comment for more great content!
If you found this content useful, and would like to support this Channel, please consider supporting this work on Patreon: patreon.com/leslaboratory
Or donate directly: paypal.me/leslaboratory
Alternatively, please share this content on your social media platforms, it really helps the channel!
0:00 Intro
0:12 Helium Neon Lasers!
0:53 Brewster Window Laser
1:46 Unusual Particle Counter Laser
2:44 Sam's Laser FAQ
4:02 Patent External Stabilized Passive Cavity
8:25 Laser Teardown
9:05 Optical Bench Setup
9:45 Laser Demo
12:43 Credits
Переглядів: 163 569
Відео
LASER Particle Counter TEARDOWN!
Переглядів 6 тис.2 місяці тому
Episode 62 #laser #electronicscreators I bought a Vintage Laser Particle Counter from eBay for a tear down. This contains all sorts of juicy stuff, including a vintage Z80 computer system, and a Laser! This contains a very special Helium Neon Laser, that will be the topic of a follow up video, so don't forget to Subscribe! Link to Die Pictures Teledyne Philbrick TP1321 www-richis lab-de.transla...
DANGEROUS Laser Power Supply Teardown!
Переглядів 6 тис.3 місяці тому
Episode 61 #laser #electronicscreators I bought a Tattoo Laser power supply from eBay and this thing is, well, terrifying. I have never seen a commercial piece of equipment built as poorly as this! This seems to be built with the added feature that it can also remove the operator. Permanently. Still, lets tear it down, attempt a repair, and power the thing on! 0:00 Intro 0:16 Tattoo Laser Power...
Shaking molecules until Laser Light comes out. DIY Raman Laser!
Переглядів 33 тис.6 місяців тому
Episode 60 #Raman #Laser In this episode, let's build a Raman Laser! First I talk about some of the background of light scattering, Rayleigh Scattering, Raman Scattering discovered by C.V Raman, then the discovery of the Raman Laser by Gisela Eckhardt. I cover the physical setup from an engineering standpoint. An old Nd:YAG Tattoo Laser I refurbished is used to pump a cuvette filled with a Rama...
Little Junk Laser is a MEGAWATT Beast!
Переглядів 121 тис.8 місяців тому
Episode 59 #photonics #Laser In this episode, a sub $30 dollar junk tattoo laser is torn right down, repaired and re-assembled into a bench-top instrument. During the repair, theory is covered, as well as some practical alignment techniques. A home made, high voltage power supply is constructed for it, generating 100 Joules for the flash-lamp. The final Solid State Q-switched nanosecond Neodymi...
Controlling Light with High Voltage and Aniseed! The Kerr Effect!
Переглядів 91 тис.9 місяців тому
Episode 58 #photonics #electro-optics #Kerr-effect In this episode, let's control light with High Voltage and Aniseed using the Kerr Effect! Ordinarily, Kerr cells use a particularly nasty and deadly Liquid as the Kerr media. In this episode I investigate a possible safe alternative using Aniseed! After a little dive in to history including mechanical television and filming nuclear bomb detonat...
Thermal camera VS Carbon Dioxide Laser!
Переглядів 9 тис.10 місяців тому
Episode 57 #thermalcamera #FLIR #carbondioxidelaser In this episode I explore a CO2 laser with a thermal camera, and manage to break it! It looks like there is potential for some really awesome experiments with it though! Check out my other videos: ua-cam.com/users/leslaboratory Please don't forget to like, subscribe and comment for more great content! If you found this content useful, and wou...
Thermal camera on the Raspberry Pi! Topdon TC001 Product review!
Переглядів 26 тис.11 місяців тому
Episode 56 #thermalcamera #FLIR #raspberrypi In this episode I review the TOPDON TC001 Thermal Camera. It can perform temperature readings accurate within 3.6℉ (2℃) or 2% of the object’s actual temperature, and display a clear thermal image with an ultra-high infrared resolution of 256x192 pixels. This works with Android devices and Windows, but even better, I wrote software so it can run on Li...
Growing Laser Crystals used in NUCLEAR FUSION!
Переглядів 25 тис.11 місяців тому
Episode 55 #optics #laser #nonlinearoptics #photonics In this episode, let’s look at growing non-linear crystals that can convert Laser Light into different colours, using a process called second harmonic generation. The crystals we will be looking at are the same crystals used in the National Ignition Facility, a Laser driven Nuclear Fusion experiment! Here is a superb paper on the National Ig...
WEIRD Fluorescence Two-Photon absorption!
Переглядів 23 тис.Рік тому
Episode 54 #optics #laser #nonlinearoptics Lets take a look at Two-photon absorption In this episode, let's look at a really unusual Fluorescence phenomenon, two photon absorption! This phenomenon is used in two photon microscopy for imaging cells buried deep in living tissue, and could be used in volumetric 3D displays and ultra dense data storage! This was originally predicted by Maria Goeppe...
15 KILOWATT LASER! Measurement and Second Harmonic Generation
Переглядів 18 тис.Рік тому
Episode 53 #optics #laser #nonlinearoptics Let's measure the Twotrees 1064nm Laser Head, and investigate non-linear second harmonic generation, converting this IR Laser to Green! 1064 laser module: bit.ly/3ZTLKeZ Check out my other videos: ua-cam.com/users/leslaboratory Please don't forget to like, subscribe and comment for more great content! If you found this content useful, and would like t...
Laser Engraver review TwoTrees TS2 20W and 1064nm Laser Head
Переглядів 8 тис.Рік тому
Episode 52 A Product review of the Twotrees TS2 Laser engraver! This has a huge bed size, z-axis control, and a massive 20W Laser head! More interestingly, Laser manufacturers have been offering 1064nm Laser heads as well, that can engrave all metals! (but I have other plans for it :-) so subscribe!) If you found this content useful, and would like to support this Channel, please consider suppo...
Digital Microscope Review Andonstar AD249S-M
Переглядів 6 тис.Рік тому
Episode 51 #microscope I was asked to do a review of the Andonstar AD249S-M Digital Microscope. Lately I have been needing glasses for close up work, so why not?! Several use cases are tested, including a nice shot of some alluvial Scottish Gold! Amazon-US: amzn.to/3OGy6Ft Amazon-UK: amzn.to/3AjyN2D Check out my other videos: ua-cam.com/users/leslaboratory Please don't forget to like,subscribe...
Hacking a Tektronix Oscilloscope to1GHz!
Переглядів 7 тис.Рік тому
Episode 50 #tektronix #1ghz #hack Lately I have run out of bandwidth, trying to measure signals from pulsed Lasers. My fastest oscilloscope was a hacked DS1054z at 100MHz, nowhere near fast enough to measure nanosecond pulses. I picked up a Tektronix TDS754C from eBay. This scope has a beautiful CRT display, and is already a decent scope, but bought it with the sole purpose of hacking it to 1GH...
Supercontinuum in Multimode Fiber
Переглядів 15 тис.Рік тому
Episode 49 #supercontinnum #whitelightlaser #laser This episode is a follow up video on a home made Supercontinuum Laser! This version uses Multimode Telecoms fiber, for much better efficiency, however this stuff also exhibits additional properties, including very bright combs, and what looks like self-mode cleaning... For a very good explanation of Stimulated Raman Scattering (the primary nonl...
Supercontinnum in Multimode Fiber Teaser
Переглядів 1,9 тис.Рік тому
Supercontinnum in Multimode Fiber Teaser
DIY SUPERCONTINUUM LASER on a BUDGET!!
Переглядів 32 тис.Рік тому
DIY SUPERCONTINUUM LASER on a BUDGET!!
Coupling Laser beams into Fiber Optic Cable!
Переглядів 51 тис.Рік тому
Coupling Laser beams into Fiber Optic Cable!
DIY Raspberry Pi Spectrometer NEW SOFTWARE!
Переглядів 26 тис.Рік тому
DIY Raspberry Pi Spectrometer NEW SOFTWARE!
Repairing a K50 CO2 Laser Cutter. Part 1
Переглядів 5 тис.Рік тому
Repairing a K50 CO2 Laser Cutter. Part 1
xTool D1 Pro Review and first project
Переглядів 4,9 тис.Рік тому
xTool D1 Pro Review and first project
CO2 Laser Engraver. Industrial Laser Coder Hacked! Part 2!
Переглядів 7 тис.Рік тому
CO2 Laser Engraver. Industrial Laser Coder Hacked! Part 2!
Industrial CO2 Laser Coder TEARDOWN and repair! Part 1!
Переглядів 18 тис.2 роки тому
Industrial CO2 Laser Coder TEARDOWN and repair! Part 1!
High Power Laser Diode Power Supply 10W and Laser Safety
Переглядів 9 тис.2 роки тому
High Power Laser Diode Power Supply 10W and Laser Safety
How to make a Triggered Spark Gap for High Voltage Lasers and Marx Generators
Переглядів 17 тис.2 роки тому
How to make a Triggered Spark Gap for High Voltage Lasers and Marx Generators
Home Made Integrating or Ulbricht Sphere
Переглядів 14 тис.2 роки тому
Home Made Integrating or Ulbricht Sphere
RGB Dye Laser? How Dye Lasers Work: Viewer Questions
Переглядів 11 тис.2 роки тому
RGB Dye Laser? How Dye Lasers Work: Viewer Questions
You should try buildinga pulsed HeNe by AOM based cavity dumping a similar setup
Could be interesting, though for that a real brewster he-ne would be preferable.
Can you do the teardown of spectroscope?
my understanding is that free space to fiber launch, especially in devices based on small numbers of relatively high power off the shelf emitters, use so called "coreless fiber end caps" to facilitate setup and mitigate practical problems. they can be >10x larger in diameter (800 micron outer cladding high power multimode fiber with 9 mm end cap), with much greater mass to sink thermal effecss, dampen resonance and alignment issues (from microscopic movement or resonance driven by ambient noise or thermally)
Looks like this is first step to fiber laser used in metal cutters. How to couple few laser diodes into one fiber?
i dont see the red and yellow orange full spectrum like i seen the first video you done?
so the longer the cable to more the spectrum? i figured the lower the power intensity too no?
what are these attenuators you are refering to?
They are made from a stack of glass microscope slides. Soda glass will absorb a fair bit of UV, but slides are thin enough and flat enough to make reasonable attenuators inexpensively.
@@LesLaboratory i dont think you mentioned any of this or shown them ,what is the point of using them then removing them and why is the spectrum then more visible when you do this?
is that the shirt worn by chris knight in real genius?
Yep! It was a moral imperative!
@@LesLaboratory lol indeed
why is the spot tingling? and as if blinking different colors, i understand freq doubling crystal but what exactly is ha[[ening here to be getting full spectrum when you are using violet laser?
is it possible to run this with a cw laser? like a cw nitrogen laser to pump the dies and get a steady output?
spectacular to see such a large crystal and they are at a reasonable price now? amazing to see the green beam just emerging out of it like that it is a nice optical illusion , i tried making a lamp pumped ndyag-doubled laser long time ago my dream was to see if i can get that beast working using 4x500w halogen lamps in a circular array wired in parallel so i only built the pump part of it and tried to get it to work with a dimmer switch but it was acting strange it would work at first then the light got bright as if the dimmer was not even there im not to savvy when it comes to more complicated circuit and electrical design, i have a glass tube that would presumably hold the ndyag inside the circular array cavity then i wanted to get the mirrors with mounts and eventually a doubling crystal and maybe have the whole thing water cooled using distilled water but it never went any further than building the pump which i still have and enjoy looking at once in a while , i did not get the rest of the parts though perhaps i was too timid with the costs and not sure of the success although i heard sam did manage to build one and get it to slightly work although it was weak beam coming out every now and then
I built this model back in 2004 in New Jersey - interesting feedback of the design. Great product.
Hey I found a really interesting paper about supercontinuum lasers using a water bath. Intense white laser of high spectral flatness via optical-damage-free water-lithium niobate module You might want to give it a look :)
Sweet! Got a link? I am considering trying some liquids in hollow core fiber, the problem is getting the fiber cheap!
@@LesLaboratory www.researching.cn/ArticlePdf/m00105/2024/3/1/016008.pdf
@@LesLaboratory Yeah UA-cam has deleted the comment with the link :/ but you can google Intense white laser of high spectral flatness via optical-damage-free water-lithium niobate module You btw you can disable comment moderation in UA-cam Studio under Settings then Upload Defaults, Advanced Settings at the bottom. But IDK if you would get to much spam.
researching dot cn slash ArticlePdf slash m00105 slash 2024 slash 3 slash 1 slash 016008 dot pdf.
The fiber cables are to electrically and thermo isolate the hv/hf group in case there is a failure you want the shutdown to still be able to detect it and do its job. I'm sure you know this just Mentioning for others interested in rolling their own controller
If you put two crystals in a row, does it frequency double twice (resulting in ~350nm at 1/4 total power)? Or does the resulting green beam pass straight through the second crystal, unaltered? I'm curious how two in-line frequency doublers differ from a triple harmonic crystal, if any. Disclaimer: I do not understand the phsycial principles/mechanisms lol
Sort of. Depending on the cut you can get the third harmonic at 355nm from a second crystal. This requires special cutting, polishing and alignment. It is also possible to get the fourth harmonic at 266nm, but this requires precision temperature control to work, and high peak powers.
How did you connect it to the toughbook?
There's a blast from the past! The tough book had an express card slot. I got an adapter from China that broke out the express card to PCie. As I recall there was weirdness with booting, I think the tough book had to be allowed to POST before power to the card was switched on, then the boot process would pick it up and load the module. I was running Linux.
@@LesLaboratory awesome! thank you so much! Do you have a link to that?
@@Recoil_Ready unfortunately no, it was years ago, but if you Google "express card to PCIe" you will find what you are looking for. They are under 20 bucks these days.
what is the purpose of those brewster windows do they reflect discard certain unwanted frequencies or was it to polarize? i still do not comprehend what polarizing does but you still need an oc right?
If the bayergrid is organic. Why not try with enzymes?
It's like a smoke ring. You push a wave through the middle of another wave of course you're gonna get self-focusing
Can you do a video on a circuit to start up an arc lamp?? I have some CW xenon laser lamps and I can get a spark through them, but I can't transfer to the low voltage DC (180V@20A) quickly enough to keep it lit. It's for a CW NdYAG build and there's so little on the web 😵💫 love your videos!
Great project, thanks for sharing!!
that is a green color kot yellow color.Some green laser has this type of green instead of deeper green.
On the raspberry pi 5 I get an error "ModuleNotFoundError: No module named 'cv2' Solved, forget to install openCV :) Works now!
yeap, interesting video, thanks! Could you share how did the DS1054z? thanks.
I think you could improve the design using an elliptical cavity, that way a great percentage of the light is reflected to the laser rod
Now his I call a laser. Electrolytic capacitors are of short life, about 3000 to 5000 hours at nominal voltage and 70C or so. Then they fade out and usually the power suplies stop working. It is better to use other cap technologies to make them to work again.
Liked and subscribed
0:56 Yooooo! 😂 and @Les' Lab that shirt is so smart. Nice GaAs reference, among other things
Enjoyed this. Thanks. I look forward to scoping your channel. Subscribed. Cheers
Thanks! Plenty of new stuff in the pipeline as well!
The switch is very much similar to what I made for a Xenon tube switch working at 1500 V with a selector for various time delays. Those were made by different combinations L And C..I used HV thyristors as switches and inductive triggers
Thank you so much for this I'm very new to this things can you please help me how to interface the camera with the raspberry pi. What are the material needed for the same( model)...... I'm a student....Thank you so much in advance 🤝🤝.......please respond🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏
Hey narrator... Aren't you the same guy that narrated Asianometri's channel? Sound guys sounds similar 😅
Really cool project. Possibly uneducated question, would you achieve greater resolution by tilting the spectrum scope relative to the camera? My thinking is that if your sampling line covers from the bottom left of the spectrum to the top right of the spectrum you’d have more pixels to sample?
Les, I was wondering about the series-injection xfmr: Can you tell me... 1) what turns ratio you used 2) the capacitance of the primary trigger caps 3) the voltage to which they are charged at firing I am assuming it's the toriod that is partially visible....would help greatly... THANKS MUCH!!! --dAle
might i ask how did you focus the 337nm beam into the fiber? how did you connect it to the ml100? how did you achive focus as everyy glass blocks 337nm, did you had to use a special fiber core?
I remember when I was about 11, doing a phd on fire. I was sitting by the window on a cool autumn day with a reasonable magnifying glass burning paper with the suns rays. I then had the brilliant idea to try using mirrors. I reached a point where I decided to reflect the tightly focussed light back at the sun and the stupid child I was , I was overcome by fear that I might blow up the sun so I did it anyway. That day I truly understood reflected light and the energy of absorbed light.
I bet the reason I cannot find the ED-100A on ebay is due to this video! I can't find the maximum pulse rate this unit is specified to be accurate at, does anyone know?
Would you be better off using ir less camara lens?
Would you publish a known set of peaks ? Will they work with a telescope?
Brilliant using a spark plug, this was just the great idea I needed! Thank you!
Awesome! What would be needed to make a spectrometer to measure something like 1200-1700nm spectrum?
// install if not exists pip install virtualenv // make environment if not exists virtualenv -p python3 env source ./env/bin/activate pip install a pip install b pip install c pip freeze > requirements.txt git add . git commit -m 'init project' ------------------ // install if not exists pip install virtualenv // make environment if not exists virtualenv -p python3 env source ./env/bin/activate git clone ... cd project pip install -r ./requirements.txt
That's nice - 30 minutes of useless chatter, 3 seconds of something I won't wait thar long to watch...
Gee. Thanks for that useless arrow in your thumbnail. There's no way anyone would have possibly known what the title of the video was referring to! /s/s/s/s. Blessed be the clickbaity useless arrows because it shows who values using clickbaity techniques over content and shows me which channels to block. Clowns. Another channel blocked. Blessed be.
Gee. Thanks for that useless arrow in your thumbnail. There's no way anyone would have possibly known what the title of the video was referring to! /s/s/s/s. Blessed be the clickbaity useless arrows because it shows who values using clickbaity techniques over content and shows me which channels to block. Clowns. Another channel blocked. Blessed be.
Gee. Thanks for that useless arrow in your thumbnail. There's no way anyone would have possibly known what the title of the video was referring to! /s/s/s/s. Blessed be the clickbaity useless arrows because it shows who values using clickbaity techniques over content and shows me which channels to block. Clowns. Another channel blocked. Blessed be.
Death to useless arrows in thumbnails.
Hi! Thank you for the informative videos, you did a great job. The question is, how to measure or test the power of the MNL-100 laser beam? It emits pulses with ultraviolet radiation. How much power should this radiation have?
Great project. Congrats !
I thought your were going to say that reflecting a LASER beam back on to itself could be used as a columnator for a telescope, I have such a laser for that purpose. BTW: I have two old, previously functioning HeNe LASER tubes, I know one is from Spectra Physics and it was bright!! It had a rating of 6.9 mW on it, but I suspect it was much more than that. I have no use for them, plus a solid-state HV power supply that powers them. When the tube sputtered and went out, I'm told that someone with the right equipment can revive them. If you're interested in them we can work out how to get them to you, only the cost of shipping. I'm in the SF Bay Area. I am cleaning up my electronics lab and really hate to junk things that potentially someone else could use.
Hi, I am a PhD student at ETH Zurich. I need a camera with as small pixel size as possible to image an optical lattice. The Pi camera v2 would be perfect for this except for the bayer filter. I tried removing it with various chemicals without success. I was wondering if I could pay you to debayer a few of these sensors