Investigation of interference on photodetector CCD by lasers with different wavelengths

Abstract

In order to study the interference mechanism about image sensor being irradiated by lasers, a monochromatic CCD and a color CCD with same type are irradiated by continuous lasers with wavelengths of 473 nm, 532 nm and 632.8 nm, respectively, and the interference phenomena are observed and the crosstalk thresholds are calculated. The digital images collected in the experiment are processed, and the interference degree curves of monochromatic CCD and color CCD under different laser powers are extracted, respectively. Analysis about experimental results indicates that the quantum efficiency of CCD material and transmittance of filter to laser will affect anti-interference ability of CCD. The higher quantum efficiency and transmittance will lead to more obvious interfering effect for CCD. Moreover, the anti-interference ability of color CCD is stronger than that of monochromatic CCD. The anti-interference ability of CCD used in the experiment for three kinds of laser wavelength ranges from strong to weak is: 473 m>532 nm>632.8 nm. Finally, the saturation point and crosstalk phenomena are simulated by analyzing the carrier overflow mode and the simulation results are basically consistent with the experimental data.