HARMONIC NOISE CHARACTERIZATION OF P-I-N-DIODES UNDER OPTICAL ILLUMINATION

She noise spectrum of a p-i-n diode under a chopped light illumination is researched both theoretically and experimentally. The observed noi se spectra can be presented in terms of a formula. The light-activated current of the device can be obtained from either a given light power or a given harmonic noise spectrum. Moreover, methods to measure the quantum efficiency and to estimate the amount of stored charge of a p- Cn diode (In0.53Ga0.47As) during the shaded period of chopped illumina tion are presented.