This is a cool series. Can't wait for the rest. You might be interested in how easy it is to make an intentionally polarizing beamsplitter by coupling two glass prisms with a capiliary layer of melted sodium nitrate between them all sitting on a cleaved mica sheet to orient the crystal growth direction.
Ah this is such a fabulous real-life demonstration of laser diode polarization. Great video, thank you for diving into the interesting fabrication details!!
I work in glass manufacturing and in quality department of the car windows so will be cool to show the quality of our imported glass. It is float glass, sometimes it feels really smooth and razor blade will glide on it sometimes really rough.
Awesome so far, i have recently been getting interested in starting my own optics project, nothing nearly as involved as this, but just have no clue on where to source some of the parts...
They rings seen when illuminating the glas sheet with a divergent source are not diffraction rings, but fringes of equal inclination otherwise known as Haidinger fringes.
These things are nice, using an LED conversion matrix to convert different programs, into beams of color-coordinated light. These beams, can be refracted, using a secondary array, again translating various programs into angles of lenses. Which project into a globe, filled with nebulized liquids, or gasses, etc... To be used to display a 3D hologram, within a globe. This globe, could have a touch screen applied to the outer layer. This globe could contain light, refracted through water droplets, and mirrors, and lenses, Or ionized gasses Based on data conversion through a GPU....
I'm loving where this is going. Was that 800 grit whetstone by chance? I have a 2000 diamond lap but think that'll be a bit of a grind to get to dimension... I'll get me coat
You might consider to start with a higher grit (about 200 should be good) and then work your way down over 400, 600, 1200 to 2000 grit. That way, you will have no breakouts anymore at the edges of the grind.
I got an interference pattern similar to the one you called "good" using a 2x2x 1/4 inch piece of glass I got, sold as "GLP2X2-S Glass Streak Plate" from United Scientific. It was readily available. Maybe I just got lucky, I think this product does not guarantee precisely parallel surfaces.
Maybe because I mentioned where I got it, some YT algorithm decided it was commercial spam. I used the green 520nm device you recommended, but I bought from the place that starts with ali and ends with express instead of a standard component vendor, for the obvious frugal reason. Seems to work ok. I got clear stable fringes at 36 mA, but it went multimode around 37 mA. Measured optical output was 3.2 mW at 36 mA, which is 3% of the 110 mW output power the site claimed but I have seen different variants of the same part with different power ratings. This was device #2. The first part also worked for a while, but then I managed to convert it into an incoherent LED I think by excessive mechanical force on the leads. So: be careful with these parts. If I move the glass several meters away, then I see irregularities in the fringes more clearly, but hopefully that is not an obstacle.
@@dancevideo2 Did you buy the PLT5 516 FA as recommended on the Github page? Anyway thank you for sharing your experience wioth the device ! Also I have no power meter so its great that you can provide the optical output power at these low currents. Its always hard to jugde by eye. Green LDs always seem so bright. And jes the furhter you move the glass plate away the more sensitive the setup becomes, so if it looks good at around 400mm you are good to go.
@@DiffractionLimited Oops, I missed that there was a github page! I am using the "Osram PLT5 520B" mentioned at 04:56 in the Interferometer video Part 1. Looking at github, I see you have tested quite a few. I just ordered some of the PLT5 516 FA so I can compare when those come in. I have a basic power meter, UNI-T UT385 which is just a calibrated photodiode so you have to enter the wavelength. Not sure of its true accuracy. I also have some bolometric-type meters, but they are likely even less well-calibrated.
@@DiffractionLimited My longer reply to this just got deleted, I wish I knew why. I was using the earlier-mentioned 520 not the 516, but eventually I will try that one too.
This is a cool series. Can't wait for the rest. You might be interested in how easy it is to make an intentionally polarizing beamsplitter by coupling two glass prisms with a capiliary layer of melted sodium nitrate between them all sitting on a cleaved mica sheet to orient the crystal growth direction.
That sounds very interesting, do you have any resources, where I can read more about this?
Ah this is such a fabulous real-life demonstration of laser diode polarization. Great video, thank you for diving into the interesting fabrication details!!
That Fizeau interferometer idea is just genius!
Really loving this series. Thanks for sharing.
I Love this Project, can't wait to see more ❤
Greate job mate 👍
This is so cool device! I would never do something like this, but that is such satisfaction to just watch somebody did
I'm exited for this project! Great job so far!
you know this guy is legit because his glass didn't explode and fill his hand with glass fragments when he used the glass cutter
I work in glass manufacturing and in quality department of the car windows so will be cool to show the quality of our imported glass. It is float glass, sometimes it feels really smooth and razor blade will glide on it sometimes really rough.
Thanx for sharing, I really like this video series!
Awesome so far, i have recently been getting interested in starting my own optics project, nothing nearly as involved as this, but just have no clue on where to source some of the parts...
They rings seen when illuminating the glas sheet with a divergent source are not diffraction rings, but fringes of equal inclination otherwise known as Haidinger fringes.
Yes its a mistake, I should have said Interference rings. Thank you for the correction.
These things are nice, using an LED conversion matrix to convert different programs, into beams of color-coordinated light.
These beams, can be refracted, using a secondary array, again translating various programs into angles of lenses.
Which project into a globe, filled with nebulized liquids, or gasses, etc...
To be used to display a 3D hologram, within a globe.
This globe, could have a touch screen applied to the outer layer.
This globe could contain light, refracted through water droplets, and mirrors, and lenses,
Or ionized gasses
Based on data conversion through a GPU....
I'm loving where this is going. Was that 800 grit whetstone by chance? I have a 2000 diamond lap but think that'll be a bit of a grind to get to dimension...
I'll get me coat
It wasn't labeled but I think 300-800 grit will work.
You might consider to start with a higher grit (about 200 should be good) and then work your way down over 400, 600, 1200 to 2000 grit. That way, you will have no breakouts anymore at the edges of the grind.
Also, a rotary grinding machine (whis is easily built) will much improve grinding exact 90deg angles.
I got an interference pattern similar to the one you called "good" using a 2x2x 1/4 inch piece of glass I got, sold as "GLP2X2-S Glass Streak Plate" from United Scientific. It was readily available. Maybe I just got lucky, I think this product does not guarantee precisely parallel surfaces.
Very good Info, Thank you.
Maybe because I mentioned where I got it, some YT algorithm decided it was commercial spam. I used the green 520nm device you recommended, but I bought from the place that starts with ali and ends with express instead of a standard component vendor, for the obvious frugal reason. Seems to work ok. I got clear stable fringes at 36 mA, but it went multimode around 37 mA. Measured optical output was 3.2 mW at 36 mA, which is 3% of the 110 mW output power the site claimed but I have seen different variants of the same part with different power ratings. This was device #2. The first part also worked for a while, but then I managed to convert it into an incoherent LED I think by excessive mechanical force on the leads. So: be careful with these parts. If I move the glass several meters away, then I see irregularities in the fringes more clearly, but hopefully that is not an obstacle.
@@dancevideo2 Did you buy the PLT5 516 FA as recommended on the Github page? Anyway thank you for sharing your experience wioth the device ! Also I have no power meter so its great that you can provide the optical output power at these low currents. Its always hard to jugde by eye. Green LDs always seem so bright.
And jes the furhter you move the glass plate away the more sensitive the setup becomes, so if it looks good at around 400mm you are good to go.
@@DiffractionLimited Oops, I missed that there was a github page! I am using the "Osram PLT5 520B" mentioned at 04:56 in the Interferometer video Part 1. Looking at github, I see you have tested quite a few. I just ordered some of the PLT5 516 FA so I can compare when those come in. I have a basic power meter, UNI-T UT385 which is just a calibrated photodiode so you have to enter the wavelength. Not sure of its true accuracy. I also have some bolometric-type meters, but they are likely even less well-calibrated.
@@DiffractionLimited My longer reply to this just got deleted, I wish I knew why. I was using the earlier-mentioned 520 not the 516, but eventually I will try that one too.
What grit of diamond whetstone do you recommend?
I think roughly between 300-800 grit is fine. Unfortunately mine was not labeled.
I was going to try this until I saw that it’s necessary to get hands up to 5x normal speed. I don’t think I can work that quickly :(
Twice now, what I thought were useful comments went away. Are technical details not allowed?
Strange, filtering options are set to default.