Abstract
A LED-driven integrating sphere uniform light source within a light-tight enclosure was used to characterize the linearity of spectral responsivity for detectors at Pico-watt and sub Pico-watt incident power levels over a wavelength range from 405 nm to 1550 nm. A UV-enhanced Si detector, a Std-InGaAs detector and an Ex-InGaAs detector were used with a pre-amplifier SR-570 and a lock-in amplifier SR-830. The results of spectral responsivity linearity and measurement uncertainty at low incident power levels will be presented and analyzed. Results from the different detectors will be compared, and the measurement methodology will be discussed.
Measuring Linearity of Detector Spectral Responsibity at Ultra-Low Incident Powers
A LED-driven integrating sphere uniform light source within a light-tight enclosure was used to characterize the linearity of spectral responsivity for detectors at Pico-watt and sub Pico-watt incident power levels over a wavelength range from 405 nm to 1550 nm. A UV-enhanced Si detector, a Std-InGaAs detector and an Ex-InGaAs detector were used with a pre-amplifier SR-570 and a lock-in amplifier SR-830. The results of spectral responsivity linearity and measurement uncertainty at low incident power levels will be presented and analyzed. Results from the different detectors will be compared, and the measurement methodology will be discussed.