Abstract
In this paper we propose two types of scanning laser illumination systems. Red (R), green (G), and blue
(B) laser diodes (LD) were combined as a scanning type light source for plant cultivation in plant
factories. Our results showed that the plants were sensitive to 20-ns-pulse width LD light, and
photosynthesis was done with high-speed modulated optical signals. We performed plant growth
experiments with another scanning type of laser illumination system combined with an image processing
camera. The growth states of the plants were detected by the image recognition function. We also
confirmed the selective photosynthesis promotions of plants by spatially selective laser illumination.
