100 fps single-pixel imaging using Fermat spiral fiber laser array

Single-pixel imaging (SPI) uses the modulated illumination light fields and corresponding single-pixel detection values to reconstruct the image. It provides advantages in remote sensing, low light level detection and other applications. To extend the detection range, fiber laser arrays are used as light source due to their high-power output and rapid refresh rate. In this work, we designed a Fermat spiral fiber laser array with 32 sub-apertures as the illumination light source. There is no spatial periodicity in the normalized second-order intensity correlation function. Therefore, we can get better image quality of SPI compared with regular arrays, like hexagon arrays. Furthermore, we incorporatedLiNbO3modulators into the array for enhanced high-speed phase modulation. We have achieved a random illumination light field modulation frequency of at least 22 kHz.At 64×64 pixel resolution, we achieved a 100 fps frame rate and the corresponding sampling rate is 4.88%. The reconstruction algorithms are Differential Ghost Imaging (DGI) and compressed sensing (Total Variation, TV). The proposed method will greatly improve the imaging speed and illumination power of the SPI. It has great application potential in the field of remote sensing based on SPI.