I have some foot-square Fresnel lenses and very high-power red LEDs, and there are quite a few ops with red-light gear. Red-sensitive Silicon Photomultipliers are available now which match the sort of focus spot size of a Fresnel lens.

For proper power on 30 THz, there are sub-£100 watercooled CO2 laser tubes of course, but you need a fairly fancy beam expander so you don't just cut a hole through the optics. Also, the kit is about as portable as an AR88.

There are stern limits on the use of optical lasers and high intensity LED beams as a result of idiots targeting aircraft pilots, with increasingly tight controls near to airports, and I guess even 10.64 micrometre radiation from those laser tubes would be subject to the same controls despite not being a risk to pilots.

The UKNanowaves IO group is the place to gather. Much like the sub9kHz and LF groups, you'll recognise some microwave op callsigns in there.

Neil G4DBN