collimation

It adds up - still, the collimation is very good for such a simple system (i.e.

The collimation is limited only by the lens diameter and quality.

It would pose an exponentially decreasing target, so to get around the diffraction limit you'd need an exponentially increasingly large collimation mechanism.

The Class 2 recall pertains to the system's built-in shielding and collimation accessories.

I have no physics education beyond high school, but I briefly became obsessed with the idea of efficient collimation of light.

Apparently beam collimation is much less of a show-stopper than I would have assumed.

But of course, conservation of optical étendue ('optical entropy' so to say) can't be cheated and absorption and scattering losses will be the trade-off for better collimation.

We spent a lot of time working on perfect collimation and hiding lens edges and making sure the view into the sky was seamless and artifact free.

Lasers do lose collimation over distance, but you can reach relativistic speeds before then (I'd argue that.02c from 1wk of 1G is relativistic).

Edit: You'll get the best collimation for 90°-angle prism films - there are other BEF types that'll smooth the angular distribution of the light recycling for wide viewing-angle displays.

Just like in liquid crystal screens, BEFs could refract light rays with high exit angles back towards the phosphor, giving you a collimation of about 45° for rectangular, linear prism films.

I guess you could call a hologram an improved lenticular process also (as in, the benefit holograms have over lenticular displays is exactly this light collimation thing?).

For example, in a path-tracing paradigm, I would (naively probably) consider radiation beam collimation similar to what we call the "cone-angle" of a particular integration method, particularly WRT calculating illumination response for a given surface, etc.

Typically for every gantry angle, the treatment planning software would split up an open field (no collimation) into a bunch of 1x1 cm^2 "beamlets" and would simulate what kind of dose distribution you would get inside the patient from each beamlet (you turn the patient CT into a big 3D grid of voxels to simulate dose in).

Collimation is poor but at a couple of meters any kind of sensor will be slag in a few seconds.