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This is a really stupid video indeed. I would not judge the IQ of the young man based on this video only. Today YouTube is a big business and his million views are worth some nice $. It is easily possible that this guy knows what he is doing and is putting a big show on his channel for fame and...

You would need achromats (lenses where the focal shift is the same over the visible spectrum) which are pretty costly. But if you can get a lens pair cheap it will definitely work with some degraded optical image quality. Singlemode

I think there is some misunderstanding in the wording here. While both terms, wave plate and polarizer can be used for an element that changes the polarization of light, I think it makes things more clearly if one uses wave plate or polarization retarder for this and polarizer for elements that...

Its not 2 polarizers but one polarizer and one wave plate. One "filters" polarization and the second one creates circular polarized light from linear one. @lazerman: There is nothing weird in the effect of the third polarizer sandwiched between the two orthogonal (to each other) ones...

Seems to be useful for modern cameras that use beam splitter to sample some part of the light to measure the needed exposure time and also the autofocus. These splitters seems to be very sensitive to polarization. I am not an expert in cameras and photography though. Singlemode

Your polarizer contains a linear polarizer followed by a retardation wave plate with lambda/4 retardation. It creates circular polarization from linear one. So your filter filters all light on one direction (depending on it's orientation) and only 1/2 in the other independent of orientation...

One side of the filter seems to reflect some light. I think this is some anti-reflection coating on the polarizer which is applied on only one side. When coming from the other side light hits the uncoated area and gets reflected inside multiple times. This effect should get worse when you...

Welcome here and be safe! Singlemode

Exactly! We (in the US) have special funds for high risk, high rewards studies and projects. If his theory would have at least some scientific back up, he would have the money in a heart beat. Singlemode

This is what I meant with showmanship. Time dilatation means that the "clock" of an object goes slowed at high speeds. The article now interprets a slower ticking time frame as something in the future. This is nonsense, as when you get "older" slower that in rest you still get older. No going...

The specsheet claims an accuracy of <2nm (typ 1nm) and a resolution <10nm. That is a strange statement since the resolution can't be worse than the accuracy, or they define resolution in an unconventional way. Nevertheless the device seems interesting if the accuracy meets one's needs. The...

Sorry to say it, but this article is pure showmanship. Everything Mr. Mallet is saying is a direct consequence of general relativity. It took him 10 years to finish a general relativity class. Nothing new about circulating objects warping space time. My body also warps space time every second of...

Welcome and be safe! Singlemode

Great Evans! Finaly you got your money back! We all should push as hard as you did to get our money back from scammers. Only then they will reduce their "activities" if it's not worthy for them. Singlemode

I bought wl selected laser diodes from them one time and they had great customer service, answered very fast and shipped the diodes ultra fast. I asked for fast shipping and payed with my credit card on their website. During the payment process I had to decide what kind of shipping I need...

Singlemode

Great job Paul! The centre wl seems to match the advertised one and also the wl spread. We really have some 488nm here ;) Can't wait to see the measurements of your remaining one! Singlemode

Nice power test Jordan. It matches very well with the test I did on the previous 495nm batch: https://laserpointerforums.com/f40/sharp-gh04955a2g-new-495nm-diodes-102136-4.html#post1512110 Singlemode

That is great Paul. Look forward to see your measurements. With this diodes being on the market now, we only have yellow and orange direct diodes left to have the complete rainbow! Singlemode

This is not possible for an undamaged single mode diode. Singlemode