For convenience sake let’s say you have 2 identical lasers, one is blue and one is red. And you shine it on lead (so none of the light leaks through) until the lead doesn’t heat up anymore. Would the temperature change at all between the different color lasers. It doesn’t have to be red or blue, it could be microwave or x ray, just different colors is nessisary.
When you say “they’re identical” what properties between the two lasers do you want to force to match?
Okay, so I don’t know much about lasers at all so I don’t know why making them identical but changing the color doesn’t work. I just want the same amount of light to be produced in the same intensity but different colors
Then, as I understand, both lasers produce beams of the same intensity (photons per area) and with the same cross section area, i.e. the number of emitted photons per unit of time is identical, the blue laser delivers more power than the red one as tobogganablaze already wrote, since blue light (high frequency, short wavelength) photons have higher energy than red light photons (low frequency, long wavelength). And the rest is up to the absorption properties of the material hit by the laser.
doesn’t have to be red or blue, it could be microwave or x ray
Technically those wouldn’t be LASER (light amplification by stimulated emission of radiation.) but MASER or XASER.
I’m probably the only asshole left that cares about this though.
You’re telling me only visible light counts as light to lasers?
explains all the CO2 infrared lasers out there.
The EM waves of near spectra, UV and IR, are commonly often referred to as ‘light’ as well. Wikipedia even states:
In physics, the term “light” may refer more broadly to electromagnetic radiation of any wavelength, whether visible or not. In this sense, gamma rays, X-rays, microwaves and radio waves are also light.
Which fits to my perception of physicists, where in astronomy every element starting at Lithium is referred to as ‘metal’.
So where do you stand on infrared lasers? Light is already a junk term for the EM spectrum that we can see, otherwise holding no specific importance.
Oh I have a question! Do all frequencies on the EM spectrum emit photons? Like, when gamma rays or X rays or microwaves hit something are photons bouncing off/being absorbed and we just can’t see them?
All EM waves are photons.
When X or gamma ray photons interact with matter, e.g. by Compton scattering, i.e. hitting electrons of an atom. Thereby the photons loose discrete amounts of energy, leading to an increase of their wavelengths, and the electrons are then lifted on corresponding higher energy levels. When the electrons ‘fall’ back onto their base levels, additional photons are emitted.
Microwave photons, however, have to low energy for this kind of interaction. They e.g. induce vibrations and oscillations of molecules which is perceived as a temperature increase.
Ooh neat! Thank you, very well described for a layman such as myself
You’re welcome.
