LED Laser Jammer Laser Diode BOOSTER upgrade

[Metaphysics]

:roll: I don't want to get into an irrelevant pissing match, but this IS the internet so here goes : ALL 650nm laser diodes have lenses in order to be collimated. I am positive of this. I've been using them and designing things with them since they first became available back in the eighties.

I agree that IR diodes don't focus as well as a red or green, but here we're talking about the diffraction limits and it will be proportional to the wavelength, so a focused NIR diode will only be about 50% bigger than a focused green.

Check out http://www.powertechnology.com/ for lasers that perform as described and these aren't particularly esoteric.

In your example of the the Green Solid State laser with the IR filter, the reason that you see the halo is due to chromatic aberration of the collimating lens. The lens positon is optimized for the green wavelengths coming out to be focussed at infinity. If the lens were adjusted, the IR could be collimated and the green would focus then diverge. Nothing about NIR inherently causes divergence.

Back to LIDAR... the other poster said 50W peak not 50mW, hence my skepticism at laser safety.

As I originally pointed out and you've found, LIDAR uses 25mW, but I was corrected that is 25mW average power. When pulsed, the LDs can be driven at much higher peak powers, but probably not 50W which would require a duty cycle of 0.05% (too low).

Whatever the peak power of the LD is, the guns can't be expecting to get more than 1% back from the car so if we use a 5mW average power laser diode but drive it with a similar peak to average power ratio as the guns use, the original proposal for improved performance remains. Hell even if we use the same LDs as the LI, then we will get LI type performance and maybe better if the ZR3 or Blinder algorithms are better.

Meta

[jimbonzzz]

Back to LIDAR... the other poster said 50W peak not 50mW, hence my skepticism at laser safety.

Yep, 50 Watts peak.

As I originally pointed out and you've found, LIDAR uses 25mW, but I was corrected that is 25mW average power.

The source information that stated 25mW is inaccurate.
Average power for laser guns is typically in the microwatts. For reference, see this calibration cert for LTI Ultralytes:


I've also seen specs for the older LTI 20/20 (which was the first police laser gun on the market in the US) which states 52 microwatts.

When pulsed, the LDs can be driven at much higher peak powers, but probably not 50W which would require a duty cycle of 0.05% (too low).

In reality, the duty cycle is even lower than that. To make things easy, take for example a Kustom ProLaser III at 200 pps (200 Hz) = one pulse every 5000000 nanoseconds. The pulse lasts for a maximum duration of 50 nanoseconds. So, the duty cycle would be 0.00001%. In some laser guns, the calibration parameters specify the the pulse duration must be less than 20 nanoseconds.

Jim

[Phillip559]

I think its good what you are doing especially if you can improve jamming ability.

You are sort of a like a Program Beta Tester but for Laser Jammers.

Well, I guess its a little different but you get the point