also refer to these effects in EPR where the lineshape is observed at fixed (microwave) frequency and in a magnetic field range. Semiconductors In a semiconductors, if all oscillations have the same eigenfrequency and the broadening in the imaginary part of the dielectric function results only from a finite damping , the system is said to be homogeneously broadened, and has a Lorentzian profile. If the system contains many oscillators with slightly different frequencies about however, then the system is inhomogeneously broadened. See also Homogeneity (physics) Voigt profile Spectral line shape References Laser science Atomic, molecular, and optical physics