/sci/ - Science & Math

>>6263129
That's correct. At least that was the case with the lasers and glass I used (IR and silica based glass).

The absorption mechanism (2-step) is in the picture. The structure drawn is the valence band in the bottom, the conduction band in the top, and band gap in the middle. Band gap is pretty much what all the semiconductors are about.

(BTW, I just now realized that the mechanism for microwave absorption will be a bit different, if at all the same. That's because the transition is not between electron bands, but rather in molecular vibration states. So not sure if such multiphoton effect is at all possible with microwave)

X-ray is energetic enough to be absorbed without the need to focus. In fact, in this diagram it will shoot the electrons out of the valence band and all the way the fuck out. And its absorption occurs a bit differently. You will not be able to get the same non-linear effect that will allow you to heat just at the focus.

X-rays, depending on frequency, do pass through substances, because their absorption mechanism is different from visible radiation, but they still get absorbed and do damage. That's why getting any amount of X-ray exposure is not a good thing.