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Actually something in the 785nm range is best. Gets you away from fluorescence. What is most important is the edge filter. Also be aware fibers going into a spec can also react and give false signals. I tried this and thought how hard can it be. Well it is harder than you think. You need...

I think you can look for medical alignment lasers. They use something like it for patients. It’s doesn’t always need to be a laser. You can use a gobo light

Damn I remember when the 5mw diode came out. Some serious power there.

Welcome and check out the archives but don’t reply to threads a decade old. If you have a question start a new thead

You might repurpose a co2 tube. You didn’t say what wavelength IR you want just what you can find. There are plenty 5 w or better 1064. If you want power and it can be pulsed there are qswitched units from two trees. Lots of possibilities. Heck open a cheap pointer and remove the doubling crystal.

I’d like two in the 20-30 mw range. I just got yellow 577 in opsl added to my projector and the color combo is really worth it. Would be nice to add this to my rgb single mode rig.

You can get a cheap laser pointer for like 2.00 on eBay. I use a green on on crows and it works well. You don’t need anything powerful. ANY laser scares them off but I tried a yellow one and some animals don’t seem to see that color. Green seems universal.

My house runneth over with used lasers. I’ll pass. Actually my 12w rgyb opsl kvant is schedule to arrive today. I’m so excited and I just can’t hide it I’m about to loose control and think I like it.

Yea I don’t read the details half the time. eBay and select USA. Number of surplus shops too. Depends what you want a pointer or a tisaph.

There are a lot of sellers just google. What in particular are you looking to find? Wavelength, power, mode, formfactor, stability, center, pulsed, ir vis uv? Need bit more info

Tinker has suffered something he has chosen not to discuss. I’m sure he is embarrassed and doesn’t know how to say so. I have no knowledge so this is just a guess. He has in the past been a great vendor. I’m very sorry to see this and I really like the one I got. I hope whatever is in his...

They are still making extemely small amounts and it looks to be through pair production so they are indeed making the particles via energy to mass conversion. The trick is separating and isolating the positrons fast enough! What they then need is to make antiprotons which are thousands of...

I got a unit while back and I can tell you it is worth the wait.

Make a nice lumia box!

The dichroic worked best. No holes!

Ok here we go….. Crystals accept energy in certain wavelengths and phase matching sat specific temperatures and energy levels and can be made to interact with this pump energy in different ways. One is second harmonic which effectively doubles the energy resulting in higher frequency. Being...

I saw a video on how they did quartz in the 50s. They dipped it in oil and looked through a polar scope. I’ve grown kdp and the quality isn’t good enough yes I got a few green flashes but nothing of quality. Buy a crystal.

Here is what I settled on. A dichroic mirror high pass . I have 7nm filter on the camera so I just reflect the band I need and pass the rest. The led brightness should be linear releative to all the wavelengths. No holes!

Fabre do you think I can just avoid the hole and remove the coating to grab a reference signal? I was just afraid of back scatter from the return signal. What I have is light enters a telecentric lens. This hits the turning mirror and is reflected back from the object set at normal incident...

You need a known reference. Order some LEDs near each wavelength to compare. 594 will be more orange than 589 but both will look amber. Or get a spectrometer. Or build your own. Get a prism and measure the displacement. If you have a hene you can use that as a single calibration point. Or...