Very real stuff (I have a PhD on this)
> Nonlinear phenomena become relevant only when the input light is very intense. Typically, in order to observe nonlinear phenomena, an intensity of the electromagnetic field of light larger than 108 V/m (and thus comparable to the atomic electric field of ~1011 V/m) is required.
I don’t know anything about this field. Can you address this point? How close are we to overcoming this in academia?
for a laser the intensity in the wavelength / frequency domain is very high, because it is coherent radiation
it just means you can use a (low power) laser to produce nonlinear optical effects.
Also "FooCo raises $X zillion round" doesn't mean they got $X zillion deposited into their bank account. There are always several milestones along the way to unlock each tranche. But the press releases never mention that.