Just the first sentence cleared most of my confusion!
I saw a couple of photos of semiconductors on Wikipedia in powder form, only now I give special attention to search for a whole crystal are the ones used to make LED's and laser's are indeed transparent.
Noticed there are many promising...
Other members correct me if am wrong but I believe most photon energies are absorbed the electron. Most times the photon has not enough energy to excite the electron to an upper energy level, so the electron does not move and absolves the light.
If the photon has equal or more energy than the...
Quantum laser diodes.
How does light escape?
I recently became very interested on the functioning of these amazing devices and so I read online about the topic of quantum wells, semiconductors and lasers.
After much reading I believe I can now understand the basics of lasers, resonant...
No way 400mW can burn steel lol!
All I can give you is experience. I had a 2W 445nm blue laser pointer focused into a 2*2mm dot. It could only burn black paper and black very thin plastic never achieving ignition.
Laser's to cut metal are in the order of kilowatts, I remember seeing a CO2...
A Betatron.
Its an electron particle accelerator and easy and simple to build if you'r not aiming for very high energies.
You can find info about on the wiki and google books.
I just don't have the tools to build that... if you succeed show us what you made :)