157
Lasers won’t make noise and aren’t moving a physical mass that would create sound as it passes by.
(sh.itjust.works)
this post was submitted on 23 Nov 2023
157 points (83.1% liked)
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The pure joy of putting a single joule of optical power into a sub nanosecond pulse.
For those not familiar with lasers, that's a GW of instantaneous power that you can focus down to a micron sized spot.
https://youtu.be/Z1Xky_ermd4?si=1Luz0fuzm4kcwIwc
All that said, the successful laser weapons right now seem to all be anti drone/aircraft and they are typically using tracked CW (not pulsed) lasers with heating over time to avoid atmospheric lensing. Lots of challenges to overcome in getting pulsed energy a long way through air.
I was wondering if we'd see pulsed lasers in anti-drone warfare.... the power supply advantages aside, focusing on just the right point in time with the pulse seems hard.
The hard part is predicting atmospheric effects to get the focus right. It's basically impossible without some form of just in time compensation. One idea I've seen is that you fire a physical projectile and use that to calibrate the focal point at arbitrary distance, almost like a laser tracer.
It's not easy but you can correct the atmosphere. This is done with guide stars and adaptive optics.
The bigger challenge is that for intense pulsed lasers, the standard laser profile causes them to self focus in air through nonlinear effects. To overcome this you need to make weird profiles like top hats that are much hard to get just right.
This is a fundamentally physical limitation that is pretty tricky to overcome.