NIST about cheap green lasers

The article at The dangerous dark companion of bright green lasers | SPIE Newsroom: SPIE
The dangerous dark companion of bright green lasers

It is interesting how they use common laying-around things detect a 1064-nm radiation

Worth to read.

They used a camera and grating to find 808, but to find 1064, you need something more elaborate.

A better idea would be to use better coatings that reflect the IR back for another pass through the crystals. This would increase efficiency as well as mitigate IR leakage. But that might cost another dollar or two. This market environment that encourages manufacturers to produce the cheapest $20 piece of Chinese crap is inherently not conducive to safety.

This has been covered before, and it will sure as shit be covered again. The IR is generally low power and stays within the green. The IR that wanders outside the green has a much lower power density.

Cyparagon said:

They used a camera and grating to find 808, but to find 1064, you need something more elaborate.

Click to expand...

a better camera

This has been covered before

Click to expand...

Do you mean this article or an IR issue in green lasers?

lazeristasUVISIR said:

a better camera

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No.

Silicon stops responding to light around 1100nm. So at 1064, even a "better"
camera would likely not do the job.

You would likely need a chemical reagent that reacts to IR as losing fluorescence in the presence of IR, or a compound that upconverts the 1064 to visible re-emission.

As far as IR in 532nm DPSS lasers go, the aspects of that are very common knowledge around here.

aryntha said:

No.

Silicon stops responding to light around 1100nm. So at 1064, even a "better"
camera would likely not do the job.

Click to expand...

Even 1064-nm is at the edge of the silicon response, it is detectable. A better camera does a job. However, it is not a standard webcam.

The attached pictures show the 100-mW green laser beam; the same laser with a long pass filter (808 a big wide stripe +1064 dot; 532 cutout); and with even a longer pass filter (only 1064-nm and ~16mW).

You would likely need a chemical reagent that reacts to IR as losing fluorescence in the presence of IR, or a compound that upconverts the 1064 to visible re-emission.

Click to expand...

This method is used for >1400 nm;

I can think of very few photographers who consider a camera better if it can see just a little bit farther into IR.

Actually, my iPhone 3GS sees 1064 nm quite well. It's not well focused, but you can certainly see the laser on a surface without any difficulty.

What if we shine a 532 laser into an LPM and simply put some goggles in the way of the beam so it has to travel through the goggles on it way to the thermopile of the LPM?

Would the remaining light that the thermopile detects be IR? (when I do this I do not see ANY green light on the thermopile, but its still giving a substantial reading)

Thanks,

Sal