Caracterização de fotodetetores para interferometria

AUTOR(ES)

Agnaldo A. Freschi

DATA DE PUBLICAÇÃO

1992

RESUMO

Bandwidth and linearity are fundamental parameters in photodetectors behavior, and their knowledge is very important for most experiments in Optics. A new method for frequency response characterization is described in this work. This technique is based on Doppler velocimetry, where the vibration of a commercial loudspeaker in an interferometric setup is used as a variable frequency optical signal source. Frequencies in the 0 to 300kHz range are thus produced, which may be easily extended to the MHz range. For linearity response to intensity, an homodyne detection technique was employed. A constant amplitude low irradiance alternate optical signal is superimposed to a continuous light onto the detector, and the corresponding a.c. signal is measured using a phase-sensitive tuned lock-in amplifier. The measured signal represents the derivative of the detector response which may be measured from zero to the upper limit of interest by simply correspondingly varying the superimposed d.c. light onto the detector. The method is very sensitive and small variations in linearity may be detected. Both these methods are applied for the characterization of Si-photodiodes in different electronic arranges

ASSUNTO(S)

medidas oticas interferometria

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