explain these terms without using ChatGPT. -Absorption, spontaneous and stimulated emission -semiconductor, band model, electrons and ghouls,p/n-doped semiconductor -Fermi distribution and fermi level -direct and indirect semiconductor -laser diode -population inversion, optical resonator, Grating spectrograph The terms below are just for assistance, do not need to be explained. Basics: Absorption, spontaneous and stimulated emission, photo effect Semiconductor: Band model, electrons and holes, p-/n-doped semiconductors, Fermi distribution and Fermi level, Band transitions, direct and indirect semiconductors, pn junction in the band model, semiconductor photodiode, light-emitting diode, laser diode Laser: Population inversion, optical resonator, mode spectrum Spectroscopy: Grating spectrograph, functionality, resolution