Recent content by laserist

Maybe I'm wrong... But the reason I want yellow isn't for how it compares to green. Green and blue are - for me cold colors - red is warm and yellow hot - balancing the cold green and blue. So compare the yellow to the red, and which red are you comparing it to?

I bought the 575, but other than an old colorimeter that I haven't pulled out of the cabinet I have no way to measure it. Still it's yellow enough for me. I've got some of the Chinese units on order - the post on photonlexicon claimed < 20mw, but that would be plenty for Lumia in a 30 or 40...

I ran an Australian unit for about 7 hours from a current limited power supply @ 1.5A and it was between 27 & 30 mw output. The Aussy said it was a 2 watt diode...

The old school planetarium laser shows (i.e. Laserium) used G-124 galvos which are slow by today’s standards, but they had 4 x,y scan pairs in each projector. Each scan pair had 3 scan glasses allowing 4 different scan thru effects AT THE SAME TIME. (That means six scan through permutations per...

The Boeing Laser is megawatt class - It's beam is 1 meter in diameter and the laser itself weighs 12000 pounds...

McMaster Carr has a 2024 tube 625" OD .458" ID (11.5 mm more or less) if you've access to a lathe you could turn it down to 14mm... 36" for $27.61 McMaster-Carr

Did you try a heat gun?...

Pager motor - no it has brushes - brushes mean discontinuous contact – which means your feedback would have holes in it – unless you limit the angle to stay on one set of contacts – but still – a best a geeky waste of time. On the other hand a brushless DC motor could work. It would be easiest...

Ok, I'll play. A long time ago I met a guy that made a laser "thingy". It was basically a small motor mount with a board on one side and a mirror on the other. You "twang" the mirror side and it rings down in a complex dampening spiral... It was kind of fun. And it could be expressive -...

You might want to consider using a single laser and a optical assembly consisting of a 50% beam splitter and a mirror bonded to achieve the offset and alignment you require.

Water has an index of refraction of about 1.33. A twenty foot column of water would have an optical length 26.6 feet. Subtract the empty length from the measured length and divide by the index of water - the index of air. You could use refraction of a beam, but ripples would play hell with the...

It might be interesting to go after something of a moire pattern with your diffraction gratings usig some sort of rotating spiral disk . Back in the day - Laserium had a number that had a similar diffraction grating theme. We used a segment from a liquid crystal display to fuzz the beam to the...

a 12" piece of 1" hex 6061 from McMasterCarr is like $16 - that's gotta be at least 12 of your "heat sinks" Throw in $0.60 for a really good setscrew and with shipping from McMasterCarr you're talking $20 each for your "Labor".

"I realized that I get a lot of negative reaction regarding the lasers (generally disregarded)" I'm in awe... Exactly what part of pissing off the owner and his customers seems like a good idea to you?

Safety glasses are a REALLY good idea. You can use a normal glass cutter or just score it with a carbide scribe. Thin glass is tricky. (i.e.1 mm is thin) pressing too hard with the glass cutter causes rather than reduces problems. High end glass cutters use a very thin oil that is wick fed to...