Method for controlling optical output power of laser diode, control device and related system

The invention relates to the field of optical particle sensing, in particular to a method for controlling the light output power of a laser diode (10). A method of controlling the light output power of a laser diode (10) is proposed, where the laser diode is associated with a photodiode (20) which converts light received from the laser diode into a photodiode current, the method comprising the steps of: obtaining a first light trimming parameter, the first light output power is indicative of a first light output power of the laser diode (10) at a first laser diode current higher than the laser threshold and a second light output power of the laser diode at a second laser diode current higher than the laser threshold different from the first laser diode current under predetermined calibration conditions; obtaining a second electrical trimming parameter indicative of a photodiode characteristic curve of photodiode current relative to laser diode current under predetermined calibration conditions; measuring the