Laser power correction method and device for suppressing relaxation oscillation, and laser

A laser power correction device for suppressing relaxation oscillation, comprising:

• a frequency segmentation module configured to perform the following steps:
• Step 1:
• setting a duty cycle of a laser to a first duty cycle and a frequency of the laser to a first frequency, adjusting current so that an average output power of the laser is a preset power, and recording the present current value, wherein a waveform of the current comprises a first level and a second level, the amplitude of the first level is smaller than the amplitude of the second level, and the amplitude of a laser relaxation oscillation waveform induced by a current signal of first level is smaller than a safety threshold;
• wherein the laser comprises a laser diode;
• Step 2:
• adjusting the frequency based on the present current value and the first duty cycle so that the average output power of the laser is the preset power, and recording all frequency values to obtain a frequency interval;
• changing the duty cycle, repeating Steps 1 and 2, to obtain frequency intervals of the laser at various duty cycles, wherein each frequency interval corresponds to a representative frequency;
• a power correction module configured to perform the following steps:
• Step 3:
• setting the duty cycle of the laser to a second duty cycle and the frequency of the laser to the representative frequency, adjusting the current so that the average output power of the laser is the minimum average power and the maximum average power, and recording the corresponding currents as the minimum current and the maximum current;
• and determining a current-average power relationship based on the minimum current, the maximum current, a peak power corresponding to the maximum current, a peak power corresponding to the minimum current, the second duty cycle, a peak power corresponding to the first level, a duration of the first level, and the representative frequency;
• changing the duty cycle, and repeating Step 3 to obtain the current-average power relationship of the laser at various duty cycles and in different frequency intervals.