Fig. 1
A schematic of the experimental biospeckle Optical Coherence Tomography system with an inset of the leaf mounted for scanning and the spray used for foliar application of the phytohormone GA3. SLD super luminescent diode, L1–L6 lenses used in the system. NA of objective lens L4 is 0.024. Here, the incident power delivered to the leaf sample was approximately 5 mW, and it was made sure that such an irradiance was below the damage threshold for the plant leaves