What is Laser?Electricity and Magnetism Level 2
a) The high reflector reflects all the incident lights, and the output coupler is partially transparent.
b) If we supply proper energy to the gain medium, the electron in the gain medium is excited from a lower to a higher energy level.
c) The wavelength and output power of laser are determined by the gain medium.
d) Only solid state or plasma state materials can be the gain medium.